Test Procedure

WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 2020 Lincoln Navigator, 2020 Lincoln Nautilus, 2020 Lincoln MKZ, 2020 Lincoln Corsair, and 2020 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.

HX1 CARRY OUT THE EVAPORATIVE EMISSION (EVAP) TEST

NOTE: The scan tool test referenced in this step may not be available on all vehicles. Proceed to the next step if the scan tool test is not available.

Carry out the EVAP Test. Refer to the instruction manual provided by the scan tool manufacturer.

Does the test pass?

Yes	No
For DTCs P0442 or P0457, the system is operating correctly at this time. Clear the PCM DTCs. REPEAT the self-test. For all others, GO to HX2.	GO to HX2.

HX2 CHECK FOR DTCS

Are DTCs P00FE, P043E, P043F, P0442, P0443, P0446, P0451, P0452, P0453, P0454, P0455, P0456, P0457, P0460, P0461, P0462, P0463, P0496, P04EA, P04EB, P04ED, P04EE, P04EF, P04F0, P144A, P144B, P144C, P1450, P2401, P2402, P2418, P2450, P2451, P24B9, P24BA, P24BB, P24BC, P24BE, P24BF, P24C0, P24C1, P260F, P2DDA or P2DDB present?

Yes	No
For DTC P0443, GO to HX4. For DTC P0446, GO to HX25. For DTC P0460, GO to HX39. For DTC P144B, GO to HX54. For DTC P2418, GO to HX31. For DTC P260F. GO to HX69. For DTCs P00FE or P144A, GO to HX11. For DTCs P0451, P0496 or P1450, GO to HX10. For DTCs P0452, P0453 or P0454, GO to HX20. For DTCs P0461, P0462 or P0463, GO to HX37. For DTCs P2401, P2402, P24B9, P24BA, P24BB, P24BC, P24BE, P24BF, P24C0, P24C1, P2DDA or P2DDB, GO to HX64. For Aviator hybrid and Explorer hybrid with DTC P2418, GO to HX56. For all others with DTC P2418, GO to HX31. For all others, GO to HX3.	For symptoms without DTCs, GO to HX13. For all others, RETURN to SYMPTOM CHARTS for further direction.

Yes

For DTC P0443, GO to HX4.
For DTC P0446, GO to HX25.
For DTC P0460, GO to HX39.
For DTC P144B, GO to HX54.
For DTC P2418, GO to HX31.
For DTC P260F. GO to HX69.
For DTCs P00FE or P144A, GO to HX11.
For DTCs P0451, P0496 or P1450, GO to HX10.
For DTCs P0452, P0453 or P0454, GO to HX20.
For DTCs P0461, P0462 or P0463, GO to HX37.
For DTCs P2401, P2402, P24B9, P24BA, P24BB, P24BC, P24BE, P24BF, P24C0, P24C1, P2DDA or P2DDB, GO to HX64.
For Aviator hybrid and Explorer hybrid with DTC P2418, GO to HX56.
For all others with DTC P2418, GO to HX31.
For all others, GO to HX3.

For symptoms without DTCs, GO to HX13.
For all others, RETURN to SYMPTOM CHARTS for further direction.

HX3 EVAPORATIVE EMISSION SYSTEM VISUAL INSPECTION

Visually inspect the EVAP system lines and hoses for incorrect connections or damage.

Are any concerns present?

Yes	No
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid, REPAIR as necessary. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX53. For all others, REPAIR as necessary. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX46.	For DTC P2450, GO to HX10. For DTCs P04F0 or P144C, GO to HX15. For DTCs P04EB, P04ED or P04EF, GO to HX42. For all others, GO to HX40.

HX4 CHECK THE PCM OUTPUT TO EVAP PURGE VALVE

Ignition OFF.
Evaporative Emission (EVAP) Purge Valve connector disconnected.

Connect a non-powered test lamp between:

Point A Evaporative Emission (EVAP) Purge Valve Connector, Harness Side	Point B Evaporative Emission (EVAP) Purge Valve Connector, Harness Side
VPWR	EVAPCP

Ignition ON, engine OFF.
Access the PCM and control the EVAPCP (PER) PID.

Does the test lamp turn ON and OFF when the output is commanded ON and OFF?

Yes	No
GO to HX5.	GO to HX6.

HX5 CHECK THE EVAP PURGE VALVE RESISTANCE

Ignition OFF.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Purge Valve Connector, Component Side	(-) Evaporative Emission (EVAP) Purge Valve Connector, Component Side
EVAPCP	VPWR

Is the resistance between 15 - 25 ohms?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX6 CHECK THE VPWR VOLTAGE TO THE EVAP PURGE VALVE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Purge Valve Connector, Harness Side	(-)
VPWR	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to HX7.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX7 CHECK THE EVAPCP CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Purge Valve Connector, Harness Side	(-) PCM Connector, Harness Side
EVAPCP	EVAPCP

Is the resistance less than 5 ohms?

Yes	No
GO to HX8.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX8 CHECK THE EVAPCP CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Evaporative Emission (EVAP) Purge Valve Connector, Harness Side	(-)
EVAPCP	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX9.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX9 CHECK THE EVAPCP CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Purge Valve Connector, Harness Side	(-)
EVAPCP	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to HX73.

HX10 CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK VACUUM

NOTE: If the EVAP canister vent valve and the fuel tank assemblies are not accessible during this step, refer to the Evaporative Emissions article and Fuel Tank and Fuel Lines article for removal instructions.

Check for kinks or bends in the fuel vapor hoses and tubes (EVAP purge valve outlet tube and EVAP canister tube).
Visually inspect the EVAP canister inlet port, EVAP canister vent valve filter, fresh air hose and canister vent hose assembly for restrictions, contamination or debris.

Is a concern present?

Yes	No
REMOVE any restrictions, contamination or debris around the fuel vapor hose and tubes and EVAP canister vent valve assembly. REMOVE kinks or bends in the EVAP purge valve outlet tube, EVAP canister tube, and canister vent hose assembly. Clear the PCM DTCs. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTCs P0451 or P2450, GO to HX11. For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with all other DTCs, GO to HX43. For all others, GO to HX11.

Yes

REMOVE any restrictions, contamination or debris around the fuel vapor hose and tubes and EVAP canister vent valve assembly.
REMOVE kinks or bends in the EVAP purge valve outlet tube, EVAP canister tube, and canister vent hose assembly.
Clear the PCM DTCs.
For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .

For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTCs P0451 or P2450, GO to HX11.
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with all other DTCs, GO to HX43.
For all others, GO to HX11.

HX11 CHECK THE FTP SENSOR VOLTAGE WITH THE FUEL FILLER CAP REMOVED OR THE CAPLESS FUEL TANK FILLER PIPE OPENED

NOTE: After installing the supplemental refueling adaptor or removing the fuel filler cap, wait one minute to allow the pressure in the fuel tank to equalize with the ambient air pressure before accessing the PID.

For vehicles with a capless fuel filler pipe,
Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
For all others,
Remove the fuel filler cap.
Ignition ON, engine OFF.
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid,
Record the FTP PID value.
For all others,

Access the PCM and monitor the FTP (PRESS) PID.

Measurement Unit	Minimum Pressure	Maximum Pressure
kPa	-0.50	0.50
psi	-0.07	0.07
in-H20	-2.0	2.0
V	2.1	2.9

Is the FTP PID reading between 1.409 - 1.54 volts (Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid) or is the pressure within specifications (all others)?

Yes	No
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L, and Explorer hybrid with DTC P2450, GO to HX61. For DTC P0451, GO to HX20. For DTCs P00FE or P144A, GO to HX17. For DTCs P0496 or P1450, GO to HX18. For all others, GO to HX31.	GO to HX12.

HX12 CHECK FOR ANY OTHER DTC

Check for other 3 wire sensor DTCs (KOEO, KOER, or continuous memory) present with the DTC P00FE, P0496, P144A, P1450 or P2450.

Are any other 3 wire DTCs present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to HX20.

HX13 CHECK IF THE ENGINE IDLES

Ignition ON, engine running.

Does the engine stall or is it unable to maintain idle?

Yes	No
GO to HX14.	For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L, and Explorer hybrid with DTC P2450, GO to HX52. For all others, GO to HX15.

HX14 CHECK THE EVAP SYSTEM FOR A STUCK OPEN EVAP PURGE VALVE

Ignition OFF.
Disconnect the fuel vapor to intake manifold line at the EVAP purge valve and cap the line at the EVAP purge valve.
Ignition ON, engine running.

Does the engine stall or is it unable to maintain idle?

Yes	No
The EVAP system is not the cause of the symptom. RETURN to SYMPTOM CHARTS for further direction.	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX15 CHECK FOR RESTRICTIONS IN THE FUEL TANK VENT SYSTEM

NOTE: Do not allow FTP sensor voltage drop to less than 1.2 volts during this step. Excessive vacuum inside the fuel tank could trigger the vacuum release in the fuel filler cap or capless fuel filler system.

NOTE: The EVAP canister vent valve is normally open and venting to the atmosphere.

Ignition ON, engine running.
Access the PCM and monitor the EVAPCV (MODE) PID.
Access the PCM and monitor the FTP (VOLT) PID.
Access the PCM and control the EVAPCP (PER) PID.
While monitoring the FTP PID, ramp open the EVAP purge valve by incrementally commanding the EVAPCP PID to 100%.

Does the FTP sensor voltage drop below 1.5 volts when the EVAP purge valve is commanded fully open?

Yes	No
GO to HX16.	For DTCs P04F0 or P144C, GO to HX50. For all others, GO to HX18.

HX16 VISUAL INSPECTION

Visually inspect the following for restrictions or contamination:
- the EVAP canister vent valve
- the EVAP canister vent valve filter
- the EVAP canister

Is a concern present?

Yes	No
REPAIR as necessary. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.	For DTCs P04F0 or P144C, GO to HX50. For all others, INSTALL a new Evaporative Emission (EVAP) Canister Vent valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX17 CHECK FOR A RESTRICTED FUEL VAPOR TUBE BETWEEN THE FTP SENSOR AND THE FUEL TANK

Ignition OFF.
Remove the fuel vapor tube assembly. Refer to the Evaporative Emissions article.
Visually inspect the fuel vapor tube for a restriction between the FTP sensor and the connection to the fuel tank or fuel pump module.
Visually inspect the connection at the fuel tank or fuel pump module for a restriction.

Is a concern present?

Yes	No
REMOVE the restriction. GO to HX18.	GO to HX18.

HX18 CHECK FOR A STUCK OPEN EVAP PURGE VALVE

Install the fuel vapor tube assembly if removed in the previous step.
Install the fuel filler cap or remove the supplemental refueling adaptor.
Ignition ON, engine OFF.
Access the PCM and monitor the FTP (VOLT) PID.
Record the FTP PID value.
Ignition ON, engine running.
Access the PCM and control the EVAPCP (PER) PID.
Close the EVAP purge valve by commanding the EVAPCP PID to 0%.
Access the PCM and control the EVAPCV (MODE) PID.
Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).

Does the FTP PID voltage value remain within 0.5V of the recorded PID voltage value within 30 seconds of closing the EVAP purge valve?

Yes	No
For DTCs P00FE or P144A, Clear the PCM DTCs. REPEAT the self-test. For all others, GO to HX19.	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX19 EVAP PURGE VALVE TEST

Ignition ON, engine running.
Access the PCM and control the EVAPCV (MODE) PID.
Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
Access the PCM and monitor the FTP (PRESS) PID.
Access the PCM and control the EVAPCP (PER) PID.
While monitoring the FTP PID, ramp open the EVAP purge valve by incrementally commanding the EVAPCP PID to 100%.

Does the FTP PID decrease?

Yes	No
For DTCs P0496 or P1450, unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z . For all others, CHECK the EVAP system for leaks. GO to HX40.	CHECK for restrictions between the fuel tank, the EVAP purge valve, and the engine intake manifold. CHECK for restrictions in the EVAP purge valve diaphragm and ports. If OK, INSTALL a new EVAP purge valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX20 CHECK THE VOLTAGE TO THE FTP SENSOR

Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
VREF	SIGRTN

Is the voltage between 4.5 - 5.5 V?

Yes	No
For DTCs P00FE, P0496, P144A or P1450, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article. For some vehicles, the FTP sensor is integral to the fuel vapor tube assembly. Clear the PCM DTCs. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE . For all others, GO to HX21.	GO to PINPOINT TEST C .

Yes

For DTCs P00FE, P0496, P144A or P1450, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article. For some vehicles, the FTP sensor is integral to the fuel vapor tube assembly.
Clear the PCM DTCs.
CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer.
For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
For all others, GO to HX21.

GO to PINPOINT TEST C .

HX21 CHECK THE FTP CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) FTP Sensor Connector, Harness Side	(-) PCM Connector, Harness Side
FTP	FTP

Is the resistance less than 5 ohms?

Yes	No
GO to HX22.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX22 CHECK FOR A SHORT BETWEEN CIRCUITS

Measure the resistance between:

(+) FTP Sensor Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTP	VREF
FTP	SIGRTN

Measure the resistance between:

(+) FTP Sensor Connector, Harness Side	(-)
FTP	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX23.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX23 CHECK THE FTP CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-)
FTP	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to HX24.

HX24 INTERMITTENT CHECK

Ignition OFF.
FTP Sensor connector connected.
PCM connector connected.
Ignition ON, engine OFF.
Access the PCM and monitor the FTP (VOLT) PID.
While monitoring the PID, wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.

Does the PID value remain steady?

Yes	No
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTC P0451, GO to HX61. For all others with DTC P0451, CHECK for kinks or bends in the fuel vapor hoses and tubes between the fuel tank and dust separator. CHECK the EVAP canister ports and canister vent hose assembly for contamination or debris. CHECK the dust separator for a restriction. REPAIR as necessary. If no concern is present, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article. Clear the PCM DTCs. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE . CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test. For all others, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE . CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.	REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.

Yes

For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTC P0451, GO to HX61.
For all others with DTC P0451, CHECK for kinks or bends in the fuel vapor hoses and tubes between the fuel tank and dust separator. CHECK the EVAP canister ports and canister vent hose assembly for contamination or debris. CHECK the dust separator for a restriction.
REPAIR as necessary.
If no concern is present, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article.
Clear the PCM DTCs.
For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer.
Clear the PCM DTCs. REPEAT the self-test.
For all others, INSTALL a new FTP sensor. REFER to the Evaporative Emissions article.
For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .
CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer.
Clear the PCM DTCs. REPEAT the self-test.

REPAIR as necessary.
Clear the PCM DTCs. REPEAT the self-test.

HX25 CHECK THE PCM OUTPUT TO THE EVAP CANISTER VENT VALVE

NOTE: For applications using the EONV EVAP leak check monitor, KAPWR provides voltage to the EVAP canister vent valve instead of VPWR.

Ignition OFF.
Evaporative Emission (EVAP) Canister Vent Valve connector disconnected.

Connect a non-powered test lamp between:

Point A Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side	Point B Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side
KAPWR - Pin 1	CANV - Pin 2
VPWR	CANV - Pin 2

Ignition ON, engine OFF.
Access the PCM and control the EVAPCV (MODE) PID.

Does the test lamp turn ON and OFF when the output is commanded ON and OFF?

Yes	No
GO to HX26.	GO to HX27.

HX26 CHECK THE EVAP CANISTER VENT VALVE RESISTANCE

NOTE: For applications using the EONV EVAP leak check monitor, KAPWR provides voltage to the EVAP canister vent valve instead of VPWR.

Ignition OFF.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Canister Vent Valve Connector, Component Side	(-) Evaporative Emission (EVAP) Canister Vent Valve Connector, Component Side
KAPWR - Pin 1	CANV - Pin 2
VPWR	CANV - Pin 2

Are the resistances between 40 - 70 ohms?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new Evaporative Emission (EVAP) Canister Vent valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX27 CHECK THE VPWR VOLTAGE TO THE EVAP CANISTER VENT VALVE

NOTE: For applications using the EONV EVAP leak check monitor, KAPWR provides voltage to the EVAP canister vent valve instead of VPWR.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side	(-)
KAPWR - Pin 1	Ground
VPWR	Ground

Are the voltages greater than 10.5 V?

Yes	No
GO to HX28.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX28 CHECK THE CANV CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side	(-) PCM Connector, Harness Side
CANV - Pin 2	CANV

Is the resistance less than 5 ohms?

Yes	No
GO to HX29.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX29 CHECK THE CANV CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side	(-)
CANV - Pin 2	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX30.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX30 CHECK THE CANV CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Canister Vent Valve Connector, Harness Side	(-)
CANV - Pin 2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to HX73.

HX31 CHECK THE EVAP VAPOR BLOCKING VALVE

Ignition OFF.
Connect the Evaporative Emission Leak Detector With On Board Nitrogen Generator 218-522C or equivalent. Refer to the tool manufacturer's instruction manual.
Disconnect the fuel vapor to EVAP canister line at the EVAP purge valve.
Connect a suitable hose adapter to the fuel vapor to EVAP canister line connection.
Connect the supply hose to the suitable hose adapter.
Access the PCM and control the EVAPCV (PER) PID.
Command the EVAPCV PID to ON (100% duty cycle).
Access the PCM and control the EVBV (PER) PID.
Command the EVBV PID to ON (100% duty cycle).
Start the pressure supply.
Monitor the flowmeter and verify the EVAP system is being pressurized.
Command the EVBV PID to OFF (0% duty cycle).

Does the flowmeter reading change to indicate the VBV is open?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	GO to HX32.

HX32 CHECK THE EVAP VAPOR BLOCKING VALVE RESISTANCE

Ignition OFF.
Evaporative Emission (EVAP) Vapor Blocking Valve connector disconnected.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Component Side	(-) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Component Side
VBV - Pin 1	VPWR - Pin 2

Is the resistance between 23 - 30 ohms?

Yes	No
GO to HX33.	INSTALL a new Evaporative Emission (EVAP) Vapor Blocking valve. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX33 CHECK THE VOLTAGE TO THE EVAP VAPOR BLOCKING VALVE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Harness Side	(-)
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to HX34.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX34 CHECK THE VBV CIRCUIT FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Harness Side	(-) PCM Connector, Harness Side
VBV - Pin 1	VBV

Is the resistance less than 5 ohms?

Yes	No
GO to HX35.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX35 CHECK THE VBV CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Harness Side	(-)
VBV - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX36.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX36 CHECK THE VBV CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Vapor Blocking Valve Connector, Harness Side	(-)
VBV - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	INSTALL a new Evaporative Emission (EVAP) Vapor Blocking valve. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX37 CHECK THE INSTRUMENT PANEL CLUSTER (IPC) FOR DTCS

Ignition ON, engine OFF.
Carry out the ICIPC self-test.

Are any DTCs present?

Yes	No
REFER to the Instrumentation, Message Center, and Warning Chimes article, DTC Charts, to continue diagnosis.	GO to HX38.

HX38 CHECK THE FLI PID

Ignition ON, engine running.
Access the PCM and monitor the FLI (PER) PID.

Does the FLI PID match the fuel gauge?

Yes	No
GO to HX39.	GO to HX73.

HX39 CHECK FOR FUEL TANK FLOAT LEVEL RESPONSE

NOTE: A dual-container (saddle type) fuel tank has two fuel level sensors. The FLI PID in the PCM is the average value of both fuel level sensors. Some dual-container tanks may require the fuel level to be greater 3/4 full before the fuel level equalizes.

Ignition ON, engine running.
Access the PCM and monitor the FLI (PER) PID.
Ignition OFF.
If the fuel level is less than 1/2 (50% on FLI), add approximately 1/4 tank of fuel.
If the fuel level is greater than 1/2 (50% on FLI), drain approximately 1/4 tank of fuel.
Ignition ON, engine running.

Does the FLI PID indicate a movement upward or downward as fuel is either added or drained?

Yes	No
Unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	REFER to the Instrumentation, Message Center, and Warning Chimes article, Symptom Charts, to diagnose the incorrect fuel gauge indication symptom.

HX40 CHECK THE FUEL FILLER CAP OR CAPLESS FUEL TANK FILLER PIPE

For vehicles with a fuel filler cap, visually inspect the fuel filler cap without initially disturbing it.
- Verify the fuel filler cap tether is visible and free to move.
- Check for missing or loose fuel filler cap.
- Check the fuel filler cap for damage.
For vehicles with a capless fuel tank filler pipe, visually inspect the capless fuel tank filler pipe inlet without initially disturbing it.
- Check the capless fuel tank filler pipe inlet for debris that prevents it from sealing.
- Check the capless fuel tank filler pipe for damage.
Install and remove the supplemental fueling adapter five times in the capless fuel tank filler pipe to clear debris on the seal and repeat the test. Refer to the Owner Literature for the location of the supplemental fueling adapter in the vehicle.

Is a concern present?

Yes	No
For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. REPAIR as necessary. GO to HX46.	For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTCs P0442, P0456, P0457, P04EA, P04EE or P2451, GO to HX43. For all others with DTCs P0455 or P0457, GO to HX41. For all others with DTCs P0442 or P0456, GO to HX46.

HX41 CHECK FOR FLI DTCS

Ignition ON, engine OFF.
Carry out the PCM self-test.

Are DTCs P0460, P0461, P0462 or P0463 present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .	GO to HX42.

HX42 CHECK THE OPERATION OF THE FUEL GAUGE

NOTE: A fuel gauge that always indicates a fuel level less than a 1/2 tank or always a full tank, may be caused by a fuel level input (FLI) concern.

Check operation of the fuel gauge.

Is the fuel gauge functioning correctly?

Yes	No
GO to HX43.	CHECK the functionality of the FLI circuit. RETURN to SYMPTOM CHARTS for further direction.

HX43 EVAPORATIVE EMISSION SYSTEM INSPECTION

Ignition OFF.
Visually inspect for:
- restricted vacuum hose between the EVAP purge valve and the engine intake manifold
- restricted fuel vapor tube between the EVAP purge valve and the EVAP leak detection control module (if equipped)
- damaged fuel filler pipe
- damaged fuel tank

Are any concerns present?

Yes	No
For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid, REPAIR as necessary. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX53. For all others, REPAIR as necessary. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX46.	For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with DTCs P0496 or P1450, GO to HX52. For Aviator hybrid, Corsair 2.5L, Escape/Kuga 2.5L and Explorer hybrid with all other DTCs, GO to HX51. For all others, GO to HX44.

HX44 CHECK THE FTP SENSOR VOLTAGE WITH THE FUEL FILLER CAP REMOVED OR THE CAPLESS FUEL TANK FILLER PIPE OPENED

For vehicles with a capless fuel filler pipe,
Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
For all others,
Remove the fuel filler cap.
Ignition ON, engine OFF.
Access the PCM and monitor the FTP (VOLT) PID.

Is the voltage between 2.1 - 2.9 V?

Yes	No
GO to HX45.	INSTALL a new FTP sensor. REFER to the Evaporative Emissions article. REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX46.

HX45 EVAP PURGE VALVE TEST

Ignition OFF.
Install the fuel filler cap or remove the supplemental refueling adaptor.
Ignition ON, engine running.
Access the PCM and control the EVAPCV (MODE) PID.
Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
Access the PCM and monitor the FTP (PRESS) PID.
Access the PCM and control the EVAPCP (PER) PID.
While monitoring the FTP PID, ramp open the EVAP purge valve by incrementally commanding the EVAPCP PID to 100%.

Does the FTP PID decrease, the engine RPM change, or the engine stall as an indication that the EVAP purge valve is opening?

Yes	No
GO to HX46.	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the PHASE 1 - Leak Verification Pressure Test. GO to HX46.

HX46 HOOK UP THE TEST EQUIPMENT

NOTE: The smoke and air flow from the Evaporative Emission Leak Detector With On Board Nitrogen Generator 218-522C or equivalent will not pass through liquid fuel. Liquid fuel may be present in the fuel tank filler pipe.

Ignition OFF.
Connect the Evaporative Emission Leak Detector With On Board Nitrogen Generator 218-522C or equivalent. Refer to the tool manufacturer's instruction manual.
Disconnect the fuel vapor to EVAP canister line at the EVAP purge valve.
- Connect a suitable hose adapter to the fuel vapor to EVAP canister line connection.

Is the test equipment hook up complete?

Yes	No
For leak detection, GO to HX47. For leak repair verification, GO to HX48.	REFER to the tool manufacturer's instruction manual for additional instructions and for helpful tips.

HX47 CARRY OUT PHASE 2 - LEAK DETECTION SMOKE TEST

NOTE: Check the EVAP hoses, EVAP purge valve, EVAP canister vent valve, EVAP canister, fuel tank, fuel filler pipe, the fuel tank area, at the fuel filler cap or capless fuel tank filler pipe inlet for leaks. Wiggle the components and connections and look for signs of leaking smoke. Smoke under pressure may not reach a leak in the fuel tank filler pipe between the check valve and the fuel filler cap or capless fuel tank filler pipe inlet. If leaking smoke is not found, carry out a visual inspection of the fuel tank filler pipe, fuel filler cap or capless fuel tank filler pipe inlet.

Remove the fuel filler cap or install the supplemental refueling adaptor.
Connect the supply hose into the suitable hose adapter.
Set the Evaporative Emission Leak Detector With On Board Nitrogen Generator 218-522C or equivalent to SMOKE.
Ignition ON, engine OFF.
Access the PCM and control the EVAPCV (PER) PID.
Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
Start the smoke supply.
Verify the connection at the fuel vapor to EVAP canister line connection at the EVAP purge valve is not leaking.
If smoke does not exit the fuel tank filler pipe after the system is pressurized, command the EVAPCV PID to open the EVAP canister vent valve. Once smoke is seen at the EVAP canister vent valve, command the EVAPCV PID close.
Install the fuel filler cap or remove the supplemental refueling adaptor once smoke exits the fuel tank filler pipe.
Continue to apply smoke to the EVAP system.
Use the halogen spotlight along the EVAP system path and look for smoke exiting at the leak.

Is the EVAP leak located?

Yes	No
REPAIR as necessary. CONNECT all the disconnected components. For repair verification, CARRY OUT the PHASE 1 - Leak Verification Pressure Test. GO to HX48.	The test passed. CONNECT all the disconnected components. CARRY OUT the PHASE 1 - Leak Verification Pressure Test. GO to HX48.

HX48 CARRY OUT THE PHASE 1 - LEAK VERIFICATION PRESSURE TEST

Calibrate the flowmeter using the 0.020 standard. Refer to the tool manufacturer's instruction manual.
Connect the supply hose to the vehicle using the suitable hose adapter.
Set the Evaporative Emission Leak Detector With On Board Nitrogen Generator 218-522C or equivalent to the 0.020 standard.
Ignition ON, engine OFF.
Access the PCM and control the EVAPCV (MODE) PID.
Close the EVAP canister vent valve by commanding the EVAPCV PID to ON (100% duty cycle).
Start the pressure supply. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to pressurize the EVAP system until the ball stops descending. Once the ball stops descending, observe if it is above or below the red pointer flag. If the measurement is below the indicator flag, the system has passed the pressure test. If the measurement is above the indicator flag, the EVAP system has an unacceptable leak.

Does the EVAP system pass the leak verification pressure test?

Yes	No
For DTCs P0455 or P0456, GO to HX49. For all others, the test passed and no concerns are present. Clear the PCM DTCs. REPEAT the self-test.	GO to HX47.

HX49 CARRY OUT THE EVAP PURGE VALVE LEAK TEST

Remove the EVAP purge valve from the vehicle. Refer to the Evaporative Emissions article.
Connect a suitable hose adapter to the EVAP purge valve at the fuel vapor to EVAP canister connection.
Connect the supply hose into the suitable hose adapter.
Start the pressure supply. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to pressurize the EVAP purge valve until the ball stops descending. Once the ball stops descending, observe if it is above or below the red pointer flag. If the measurement is below the indicator flag, the EVAP purge valve has passed the pressure test. If the measurement is above the indicator flag, the EVAP purge valve has an unacceptable leak.

Does the EVAP purge valve pass the leak verification test?

Yes	No
The test passed and no concerns are present. Clear the PCM DTCs. REPEAT the self-test.	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. CARRY OUT the EVAP Test. REFER to the instruction manual provided by the scan tool manufacturer. Clear the PCM DTCs. REPEAT the self-test.

HX50 CHECK THE EVAP EJECTOR CONNECTIONS

NOTE: On some vehicles the EVAP ejector is integrated with the EVAP purge valve assembly. Refer to ENGINE CONTROL COMPONENTS for additional information.

Remove the EVAP ejector from the vehicle. Refer to the Evaporative Emissions article.
Visually inspect the EVAP ejector connections at the intake air system tube for a restriction.
Visually inspect the EVAP ejector connections for a restriction.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	For F-150 2.7L, F-150 3.5L, Ford GT and Transit 3.5L, INSTALL a new EVAP Ejector. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test. For all others, INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX51 CARRY OUT SMOKE MACHINE PHASE 2 - LEAK DETECTION SMOKE TEST

NOTE: Do not apply smoke to the EVAP leak detection control module. Internal module damage may result.

NOTE: Wiggle the components and connections and look for signs of leaking smoke. Smoke under pressure may not reach a leak in the fuel tank filler pipe between the check valve and the capless fuel tank filler pipe inlet. If leaking smoke is not found, carry out a visual inspection of the fuel tank filler pipe and capless fuel tank filler pipe inlet.

NOTE: Additional DTCs may set during the smoke machine phase 2 - leak detection smoke test.

Ignition OFF.
Connect the Rotunda Smoke Machine, Fuel Evaporative Emission System Tester 218-00001 or equivalent.
Position the control lever on the smoke machine to SMOKE.
Disconnect the EVAP canister line to the EVAP leak detection control module at the EVAP leak detection control module port. Cap the EVAP leak detection control module at the EVAP leak detection control module port to prevent debris from entering the EVAP leak detection control module.
Connect a suitable hose adapter to the disconnected EVAP canister line.
Connect the smoke supply hose into the hose adapter.
Install the supplemental refueling adaptor.
Ignition ON, engine OFF.
Access the PCM and control the EVAP_SW_VLV (MODE) PID.
Command the FTIV open.
Start the smoke machine.
Remove the supplemental refueling adaptor once smoke exits the fuel tank filler pipe.
Continue to smoke the system for 60 seconds.
Press and release the remote starter button in intervals of approximately 15 seconds ON and 15 seconds OFF while checking for exiting smoke.
Use the halogen spotlight along the EVAP system path and look for smoke exiting at the leak.

Is the EVAP leak located?

Yes	No
REPAIR as necessary. CONNECT all the disconnected components. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX53.	CONNECT all the disconnected components. GO to HX52.

HX52 CARRY OUT THE EVAP PURGE VALVE LEAK TEST

Disconnect the EVAP purge valve line at the EVAP purge valve.
Connect a vacuum gauge to the EVAP purge valve.
Ignition ON, engine running.
Access the PCM and control the EVAPCP (PER) PID.
Command the EVAP purge valve fully closed.
Record the value on the vacuum gauge.
Command the EVAP purge valve fully open.
Record the value on the vacuum gauge.

Is no vacuum present when the EVAP purge valve is commanded closed and is vacuum present when the EVAP purge valve is commanded open?

Yes	No
For DTC P2451, GO to HX56. For DTCs P04ED or P04EF, GO to HX71. For DTCs P0496 or P1450, the concern is intermittent. Clear the PCM DTCs. REPEAT the self-test. For symptoms without DTCs, the EVAP system is not the cause of the symptom. RETURN to SYMPTOM CHARTS for further direction. For all others, GO to HX53.	INSTALL a new Evaporative Emission (EVAP) Purge valve. REFER to the Evaporative Emissions article. CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX53.

HX53 CARRY OUT THE SMOKE MACHINE PHASE 1 - LEAK VERIFICATION PRESSURE TEST

NOTE: Additional DTCs may set during the smoke machine phase 1 - leak verification pressure test.

Ignition OFF.
Connect the EVAP purge valve line at the EVAP purge valve.
Connect the EVAP canister line to the EVAP leak detection control module at the EVAP leak detection control module.
Disconnect the EVAP leak detection control module line at the EVAP leak detection filter.
Connect a suitable hose adapter to the EVAP leak detection control module.
Position the control lever on the smoke machine to METER.
Calibrate the smoke machine flowmeter using the 0.020 or 0.040 standard.
Connect the air supply hose nozzle into the suitable hose adapter.
Ignition ON, engine OFF.
Access the PCM and control the EVAP_SW_VLV (MODE) PID.
Command the FTIV open.
Press the remote starter button on the smoke machine. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to press the remote starter button until the ball stops descending. Once the ball stops descending, observe if it is above or below the red pointer flag. If the measurement is below the indicator flag, the system has passed the pressure test. If the measurement is above the indicator flag, the EVAP system has an unacceptable leak.

Does the EVAP system pass the leak verification pressure test?

Yes	No
For repair verification, the test passed. CONNECT all disconnected components. Clear the PCM DTCs. REPEAT the self-test. For all others, the concern is intermittent. INSPECT the capless fuel filler pipe for signs of leaks or contamination. Clear the PCM DTCs. REPEAT the self-test.	GO to HX51.

HX54 CHECK FOR CONTAMINATION, DEBRIS OR RESTRICTIONS AROUND THE FUEL VAPOR VENT TUBE

Disconnect the EVAP canister vent line to the EVAP leak detection control module at the EVAP leak detection control module.
Check for contamination, debris or restrictions around EVAP canister vent line between the vent inlet and the EVAP leak detection control module.

Is a concern present?

Yes	No
REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to HX55.

HX55 CHECK THE EVAP LEAK DETECTION FILTER

Check the EVAP leak detection filter for contamination or restrictions.

Is a concern present?

Yes	No
INSTALL a new EVAP leak detection filter. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.	GO to HX64.

HX56 CHECK THE RESISTANCE

Ignition OFF.
FTIV Solenoid connector disconnected.

Measure the resistance between:

(+) FTIV Solenoid Connector, Component Side	(-) FTIV Solenoid Connector, Component Side
FTIV - Pin 1	VPWR - Pin 2

Is the resistance between 18 - 24 ohms?

Yes	No
GO to HX57.	INSTALL a new FTIV solenoid. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX57 CHECK THE VPWR CIRCUIT

Ignition ON, engine OFF.

Measure the voltage between:

(+) FTIV Solenoid Connector, Harness Side	(-)
VPWR - Pin 2	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to HX58.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX58 CHECK FOR AN OPEN CIRCUIT

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) FTIV Solenoid Connector, Harness Side	(-) PCM Connector, Harness Side
FTIV - Pin 1	FTIV

Is the resistance less than 5 ohms?

Yes	No
GO to HX59.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX59 CHECK FOR A SHORT TO GROUND

Measure the resistance between:

(+) FTIV Solenoid Connector, Harness Side	(-)
FTIV - Pin 1	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX60.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX60 CHECK FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) FTIV Solenoid Connector, Harness Side	(-)
FTIV - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	For DTC P2451, GO to HX61. For all others, GO to HX73.

HX61 CARRY OUT THE FTIV LEAK TEST

Ignition OFF.
FTIV Solenoid connector connected.
PCM connector connected.
Connect the Rotunda Smoke Machine, Fuel Evaporative Emission System Tester 218-00001 or equivalent.
Position the control lever on the smoke machine to METER.
Calibrate the smoke machine flowmeter using the 0.020 or 0.040 standard.
Disconnect the EVAP purge line from the FTIV.
Connect a suitable hose adapter to the FTIV.
Connect the air supply hose nozzle into the hose adapter.
Press the remote starter button on the smoke machine. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to press the remote starter button until the ball stops descending. Once the ball stops descending, observe if it is above or below the red pointer flag. If the measurement is below the indicator flag, the FTIV has passed the pressure test. If the measurement is above the indicator flag, the FTIV has an unacceptable leak.

Does the FTIV pass the leak test?

Yes	No
For DTC P2450, GO to HX63. For all others, GO to HX62.	INSTALL a new FTIV solenoid. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX62 CARRY OUT THE FTIV STUCK CLOSED TEST

Press the remote starter button on the smoke machine. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to press the remote starter button until the ball stops descending.
Once the ball stops descending,
Access the PCM and control the EVAP_SW_VLV (MODE) PID.
Command the FTIV open.
If the measurement is below the indicator flag, the FTIV is stuck closed. If the measurement is above the indicator flag, the FTIV is open and passed the test.

Does the FTIV pass the test?

Yes	No
For DTC P0451, GO to HX63. For all others, UNABLE to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new FTIV solenoid. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX63 CARRY OUT THE FUEL VAPOR VENT VALVE (FVVV) LEAK TEST

Close the fuel tank fill door.
Ignition ON, engine OFF.
Ignition OFF.
Disconnect the EVAP purge line from the FVVV.
Connect a suitable hose adapter to the FVVV.
Connect the air supply hose into the hose adapter.
Press the remote starter button on the smoke machine. Notice that the ball in the flowmeter is all the way at the top. This indicates the system is being pressurized.
Continue to press the remote starter button until the ball stops descending. Once the ball stops descending, observe if it is above or below the red pointer flag. If the measurement is below the indicator flag, the FVVV has passed the pressure test. If the measurement is above the indicator flag, the FVVV has an unacceptable leak.

Does the FVVV pass the leak test?

Yes	No
UNABLE to duplicate or identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new Fuel Vapor Vent valve. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX64 CHECK THE EVAP LEAK DETECTION CONTROL MODULE VPWR CIRCUIT

Evaporative Emission (EVAP) Leak Detection Control Module connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side	(-)
VPWR - Pin 2, 8	Ground

Is the voltage greater than 10.5 V?

Yes	No
GO to HX65.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX65 CHECK THE EVAP LEAK DETECTION CONTROL MODULE VREF CIRCUIT

Measure the voltage between:

(+) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side	(-) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side
VREF - Pin 7	SIGRTN - Pin 5

Is the voltage between 4.5 - 5.5 V?

Yes	No
GO to HX66.	GO to PINPOINT TEST C .

HX66 CHECK THE EVAP LEAK DETECTION CONTROL MODULE CIRCUITS FOR AN OPEN

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side	(-) PCM Connector, Harness Side
EVAPLDP - Pin 1	EVAPLDP
EVAPLDPPR - Pin 6	EVAPLDPPR
EVAPLDPSV - Pin 4	EVAPLDPSV

Are the resistances less than 5 ohms?

Yes	No
GO to HX67.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

HX67 CHECK THE EVAP LEAK DETECTION CONTROL MODULE CIRCUITS FOR A SHORT TO GROUND

Measure the resistance between:

(+) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side	(-)
EVAPLDP - Pin 1	Ground
EVAPLDPPR - Pin 6	Ground
EVAPLDPSV - Pin 4	Ground

Are the resistances greater than 10K ohms?

Yes	No
GO to HX68.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

HX68 CHECK THE EVAP LEAK DETECTION CONTROL MODULE CIRCUITS FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) Evaporative Emission (EVAP) Leak Detection Control Module Connector, Harness Side	(-)
EVAPLDP - Pin 1	Ground
EVAPLDPPR - Pin 6	Ground
EVAPLDPSV - Pin 4	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	For DTC P144B, unable to duplicate or identify the concern at this time. GO to PINPOINT TEST Z . For all others, INSTALL a new Evaporative Emission (EVAP) Leak Detection Control module. REFER to the Evaporative Emissions article. Clear the PCM DTCs. REPEAT the self-test.

HX69 CHECK FOR THE PRESENCE OF ANY MODULE COMMUNICATION CONCERNS

Ignition ON, engine OFF.
Check for self-test DTCs in all of the vehicle modules.

Are any communication concerns or communication DTCs present?

Yes	No
For communication concerns in the PCM, DISREGARD the current diagnostic trouble code (DTC) at this time. DIAGNOSE the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . For communication concerns in other modules, REFER to the applicable Service Information to diagnose the communication DTC.	GO to HX70.

HX70 CHECK THE PERFORMANCE OF THE PROCESSOR

Ignition OFF.
Disconnect the battery and wait for 1 minute. Refer to the Battery, Mounting and Cables article.
Connect the battery.
Ignition ON, engine running.
Allow the engine idle to stabilize.
Access the PCM and monitor the FTP (VOLT) PID.

Is the voltage between 2.1 - 2.9 V?

Yes	No
GO to HX72.	GO to HX71.

HX71 CARRY OUT THE PCM SELF-TEST

Idle the engine for 2 minutes.
Carry out the PCM self-test.

Are DTCs P04ED, P04EF or P260F present?

Yes	No
For DTC P260F, GO to HX72. For all others, INSTALL a new Evaporative Emission (EVAP) Leak Detection Control module. Clear the PCM DTCs. REPEAT the self-test.	The system is operating correctly at this time.

HX72 CHECK THE PCM FOR THE LATEST CALIBRATION

Program the PCM to the latest calibration.
Ignition ON, engine running.
Idle the engine for 2 minutes.
Carry out the PCM self-test.

Is DTC P260F present?

Yes	No
GO to HX73.	RETURN the vehicle to the customer.

HX73 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.