Test Procedure

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

HX1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Are any of the following DTCs present during PCM or transaxle control module (TCM) self-test: P0442, P0443, P0446, P0451, P0452, P0453, P0455, P0456, P0457, P0460, P0461, P0462, P0463, P144A, P1450, P2418, P2450, or P260F?

Yes	No
For continuous memory DTCs P0442 and P0456, GO to HX49. For DTC P0443, GO to HX2. For DTC P0446, GO to HX34. For DTC P0451, GO to HX18. For DTC P0452, GO to HX19. For DTC P0453, GO to HX24. For continuous memory DTCs P0455 and P0457, GO to HX43. For DTC P0460, GO to HX42. For DTCs P0461 through P0463, GO to HX40. For DTC P144A, GO to HX52. For continuous memory DTC P1450, GO to HX8. For DTC P2418, GO to HX53. For continuous memory DTC P2450, GO to HX59. For DTC P260F, GO to HX60.	Unable to duplicate or identify the concern at this time. RETURN to SYMPTOM CHARTS for further direction.

Yes

For continuous memory DTCs P0442 and P0456, GO to HX49.
For DTC P0443, GO to HX2.
For DTC P0446, GO to HX34.
For DTC P0451, GO to HX18.
For DTC P0452, GO to HX19.
For DTC P0453, GO to HX24.
For continuous memory DTCs P0455 and P0457, GO to HX43.
For DTC P0460, GO to HX42.
For DTCs P0461 through P0463, GO to HX40.
For DTC P144A, GO to HX52.
For continuous memory DTC P1450, GO to HX8.
For DTC P2418, GO to HX53.
For continuous memory DTC P2450, GO to HX59.
For DTC P260F, GO to HX60.

Unable to duplicate or identify the concern at this time.
RETURN to SYMPTOM CHARTS for further direction.

HX2 DTC P0443: CHECK THE PCM OUTPUT TO EVAP CANISTER PURGE VALVE

Ignition OFF.
EVAPCP Valve connector disconnected.

Connect a non-powered test lamp between:

Point A EVAPCP Valve Connector, Harness Side	Point B EVAPCP Valve Connector, Harness Side
VPWR - Pin 2	EVAPCP - Pin 1

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

Does the test lamp turn on and off when the output(s) is commanded on and off?

Yes	No
GO to HX3.	GO to HX4.

HX3 CHECK THE EVAP CANISTER PURGE VALVE SOLENOID RESISTANCE

Ignition OFF.
EVAPCP Valve connector disconnected.

Measure the resistance between:

(+) EVAPCP Valve Connector, Component Side	(-) EVAPCP Valve Connector, Component Side
EVAPCP - Pin 1	VPWR - Pin 2

Is the resistance between 13.5 - 24.5 ohms?

Yes	No
Unable to identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new EVAPCP valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX4 CHECK THE VPWR VOLTAGE TO EVAP CANISTER PURGE VALVE

Measure the voltage between:

(+) EVAPCP Valve Connector, Harness Side	(-) Vehicle Battery
VPWR - Pin 2	Negative terminal

Is the voltage greater than 10 V?

Yes	No
GO to HX5.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX5 CHECK THE EVAPCP CIRCUIT FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) EVAPCP Valve Connector, Harness Side
EVAPCP - Pin E31	EVAPCP - Pin 1

Is the resistance less than 5 ohms?

Yes	No
GO to HX6.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX6 CHECK THE EVAPCP CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

(+) PCM Connector, Harness Side	(-)
EVAPCP - Pin E31	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX7.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX7 CHECK THE EVAPCP CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition ON, engine OFF.

Measure the voltage between:

(+) EVAPCP Valve Connector, Harness Side	(-)
EVAPCP - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.	GO to HX64.

HX8 DTC P1450: CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK VACUUM

NOTE: If the CV solenoid and the fuel tank assemblies are not accessible during this step, refer to the EVAPORATIVE EMISSIONS -- HYBRID and FUEL TANK & LINES for removal instructions.

Ignition OFF.
Check for kinks or bends in the fuel vapor hoses/tubes (EVAPCP outlet tube and EVAP canister tube).
Visually inspect the EVAP canister inlet port, CV solenoid filter, and canister vent hose assembly for contamination or debris.
Check the CV solenoid filter for blockage or contamination.

Is a concern present?

Yes	No
REMOVE any contamination or debris around the fuel vapor hose/tubes and CV solenoid assembly. REMOVE kinks or bends in the EVAPCP outlet tube, EVAP canister tube, and canister vent hose assembly. CLEAR the DTCs. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	GO to HX9.

HX9 CHECK THE FTP SENSOR VOLTAGE WITH THE CAPLESS FUEL TANK FILLER PIPE OPEN

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

Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
Ignition ON, engine OFF.

Access the PCM and monitor the FTP PID.

AMBIENT AIR PRESSURE SPECIFICATIONS

Measurement Unit	Minimum Pressure	Maximum Pressure
kPa	-0.50	0.50
psi	-0.07	0.07
in-H20	-2.0	2.0
V	2.35	2.9

Is the pressure within specifications?

Yes	No
GO to HX13.	GO to HX10.

HX10 CHECK FOR ANY OTHER DTC

Check for other 3-wire sensor DTCs (KOEO, KOER, or continuous memory) present with the DTC P1450.
Carry out the self-test.

Are any other 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 HX11.

HX11 CHECK THE VOLTAGE TO THE FTP SENSOR

Ignition OFF.
FTP Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTPREF - Pin 3	SIGRTN - Pin 2

Is the voltage between 4 - 6 V?

Yes	No
INSTALL a new FTP sensor. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. For repair verification, CARRY OUT the evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	GO to HX12.

HX12 CHECK THE FTPREF AND SIGRTN CIRCUIT FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTPREF - Pin B66	FTPREF - Pin 3
SIGRTN - Pin B58	SIGRTN - Pin 2

Are the resistances less than 5 ohms?

Yes	No
GO to HX64.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX13 CHECK IF THE ENGINE WILL IDLE

Ignition ON, engine running.

Does the engine stall or cannot maintain idle?

Yes	No
GO to HX14.	GO to HX15.

HX14 CHECK THE EVAP SYSTEM FOR A STUCK OPEN VALVE

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

Does the engine stall or cannot maintain idle?

Yes	No
The EVAP system is not the cause of the symptom. RETURN to SYMPTOM CHARTS for further direction.	INSTALL a new EVAPCP valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX15 CHECK FOR BLOCKAGE 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 capless fuel filler system.

NOTE: The CV is normally open and venting to the atmosphere.

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

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

Yes	No
CHECK for blockage in the vapor line to the CV solenoid. CHECK the CV solenoid filter for blockage or contamination. CHECK the carbon canister for blockage. If OK, INSTALL a new CV solenoid. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.	GO to HX16.

HX16 CHECK THE EVAP SYSTEM FOR A STUCK OPEN VALVE

Ignition ON, engine running.
Access the PCM and control the EVAPCP PID.
Close the EVAPCP by commanding the EVAPCP to a 0 % duty cycle.
Access the PCM and control the EVAPCV PID.
Close the CV solenoid by commanding the EVAPCV PID to a 100% duty cycle.
Access the PCM and monitor the FTP PID.

Does the FTP PID decrease, the engine RPM change, or the engine stall, as an indication that the EVAPCP valve is stuck open?

Yes	No
INSTALL a new EVAPCP valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.	GO to HX17.

HX17 EVAP CANISTER PURGE VALVE TEST

Ignition ON, engine running.
Access the PCM and control the EVAPCV PID.
Close the CV solenoid by commanding the EVAPCV PID to a 100% duty cycle.
Access the PCM and control the EVAPCP PID.
Access the PCM and monitor the FTP PID.
While monitoring the FTP PID, ramp open the EVAP canister purge valve by incrementally commanding the EVAPCP PID to a 100% duty cycle.

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

Yes	No
For DTC P1450, CHECK for a stuck closed fuel vapor vent valve. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. For all others, CHECK the EVAP system for leaks, GO to HX43.	CHECK for blockages between the fuel tank, the EVAP canister purge valve, and the engine intake manifold. CHECK for obstructions in the EVAP canister purge valve diaphragm and ports. If OK, INSTALL a new EVAPCP valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX18 DTC P0451: CHECK THE FTP SENSOR FOR CORRECT OPERATION

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

Ignition OFF.
Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
Ignition ON, engine OFF.

Access the PCM and monitor the FTP PID.

AMBIENT AIR PRESSURE SPECIFICATIONS

Measurement Unit	Minimum Pressure	Maximum Pressure
kPa	-0.50	0.50
psi	-0.07	0.07
in-H20	-2.0	2.0
V	2.35	2.9

Is the pressure within specifications?

Yes	No
CHECK for kinks or bends in the fuel vapor hoses/tubes between the fuel tank and dust separator. CHECK the EVAP canister ports and canister vent hose assembly for contamination or debris. CHECK the fuel vapor vent valve for contamination or debris. CHECK the dust separator for blockage. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.	INSTALL a new FTP sensor. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX19 DTC P0452: CHECK FOR FTP SENSOR CONNECTOR CONTAMINATION

Ignition OFF.
Visually check for liquid fuel contamination of the FTP sensor and electrical connector.

Does the FTP sensor or connector show any signs of fuel contamination?

Yes	No
REPAIR as necessary. ADJUST the fuel tank overfill. CLEAR the DTCs. REPEAT the self-test.	GO to HX20.

HX20 CHECK FOR LOW FTP SENSOR VOLTAGE

NOTE: The FTP sensor voltage with no pressure or vacuum on the fuel tank is between 2.35 and 2.9 volts.

Ignition ON, engine OFF.
Access the PCM and monitor the FTP PID.

Is the voltage less than 0.22 V?

Yes	No
GO to HX21.	The concern that produced the DTC P0452 is intermittent. GO to PINPOINT TEST Z .

HX21 CHECK THE OPPOSITE INDUCED HIGH FTP SENSOR SIGNAL

Ignition OFF.
FTP Sensor connector disconnected.

Connect a 5 amp fused jumper wire between the following:

Point A FTP Sensor Connector, Harness Side	Point B FTP Sensor Connector, Harness Side
FTPREF - Pin 3	FTP - Pin 1

Ignition ON, engine OFF.
Access the PCM and monitor the FTP PID.

Is the voltage between 4 - 6 V?

Yes	No
INSTALL a new FTP sensor. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.	GO to HX22.

HX22 CHECK THE VOLTAGE TO THE FTP SENSOR

Ignition OFF.
Remove the jumper wire(s).
Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTPREF - Pin 3	SIGRTN - Pin 2

Is the voltage between 4 - 6 V?

Yes	No
GO to HX23.	GO to PINPOINT TEST C .

HX23 CHECK THE FTP CIRCUIT(S) FOR A SHORT TO SIGRTN OR GND IN THE HARNESS

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
FTP - Pin B65	SIGRTN - Pin B58

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) Vehicle Battery
FTP - Pin B65	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to HX64.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX24 DTC P0453: CHECK FOR A HIGH FTP SENSOR VOLTAGE

NOTE: The FTP sensor voltage with no pressure or vacuum on the fuel tank is between 2.35 and 2.9 volts.

Ignition ON, engine OFF.
Access the PCM and monitor the FTP PID.

Is the voltage greater than 4.85 V?

Yes	No
GO to HX25.	The concern that produced the DTC P0453 is intermittent. GO to PINPOINT TEST Z .

HX25 CHECK THE FTP CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
FTP Sensor connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-) Vehicle Battery
FTP - Pin 1	Negative terminal

Is any voltage present?

Yes	No
GO to HX26.	GO to HX27.

HX26 CHECK THE FTP CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition OFF.
PCM connector disconnected.
Ignition ON, engine OFF.

Measure the voltage between:

(+) PCM Connector, Harness Side	(-) Vehicle Battery
FTP - Pin B65	Negative terminal

Is any voltage present?

Yes	No
REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.	GO to HX64.

HX27 INSTALL A JUMPER BETWEEN THE FTP SIGNAL AND THE SIGRTN CIRCUITS

Ignition OFF.

Connect a 5 amp fused jumper wire between the following:

Point A FTP Sensor Connector, Harness Side	Point B FTP Sensor Connector, Harness Side
FTP - Pin 1	SIGRTN - Pin 2

Ignition ON, engine OFF.
Access the PCM and monitor the FTP PID.

Is the voltage between 4 - 6 V?

Yes	No
GO to HX33.	GO to HX28.

HX28 CHECK THE OPPOSITE INDUCED LOW FTP SIGNAL

Access the PCM and monitor the FTP PID.

Is the voltage less than 0.1 V?

Yes	No
GO to HX29.	GO to HX31.

HX29 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS AT THE FTP SENSOR VEHICLE HARNESS CONNECTOR

Ignition OFF.
Remove the jumper wire(s).
Ignition ON, engine OFF.

Measure the voltage between:

(+) FTP Sensor Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTPREF - Pin 3	SIGRTN - Pin 2

Is the voltage between 4 - 6 V?

Yes	No
GO to HX30.	GO to PINPOINT TEST C .

HX30 CHECK THE FTP CIRCUIT FOR A SHORT TO VREF

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
VREF - Pin B66	FTP - Pin B65

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new FTP sensor. REFER to the ENGINE EMISSION CONTROL -- HYBRID . CLEAR the DTCs. REPEAT the self-test.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX31 CHECK THE FTP CIRCUIT FOR AN OPEN IN THE HARNESS

Ignition OFF.
Remove the jumper wire(s).
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
FTP - Pin B65	FTP - Pin 1

Is the resistance less than 5 ohms?

Yes	No
GO to HX32.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX32 CHECK THE SIGRTN CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) FTP Sensor Connector, Harness Side
SIGRTN - Pin B58	SIGRTN - Pin 2

Is the resistance less than 5 ohms?

Yes	No
GO to HX33.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX33 CHECK THE FTP CIRCUIT FOR A SHORT TO VREF

Ignition OFF.
Remove the jumper wire(s).
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
FTP - Pin B65	VREF - Pin B66

Is the resistance greater than 10K ohms?

Yes	No
GO to HX64.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX34 DTC P0446: CHECK THE PCM OUTPUT TO THE CV SOLENOID

Ignition OFF.
CV Solenoid connector disconnected.

Connect a non-powered test lamp between:

Point A CV Solenoid Connector, Harness Side	Point B CV Solenoid Connector, Harness Side
B+ - Pin 1	CANV - Pin 2

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

Does the test lamp turn on and off when the output(s) is commanded on and off?

Yes	No
GO to HX35.	GO to HX36.

HX35 CHECK THE CV SOLENOID RESISTANCE

Ignition OFF.

Measure the resistance between:

(+) CV Solenoid Connector, Component Side	(-) CV Solenoid Connector, Component Side
B+ - Pin 1	CANV - Pin 2

Is the resistance between 48 - 65 ohms?

Yes	No
Unable to identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new CV solenoid. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX36 CHECK THE B+ CIRCUIT FOR AN OPEN

Measure the voltage between:

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

Is the voltage greater than 10 V?

Yes	No
GO to HX37.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX37 CHECK THE CANV CIRCUIT FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) CV Solenoid Connector, Harness Side
CANV - Pin B20	CANV - Pin 2

Is the resistance less than 5 ohms?

Yes	No
GO to HX38.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX38 CHECK THE CANV CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

Measure the resistance between:

(+) CV Solenoid Connector, Harness Side	(-) Vehicle Battery
CANV - Pin 2	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to HX39.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX39 CHECK THE CANV CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition ON, engine OFF.

Measure the voltage between:

(+) CV Solenoid Connector, Harness Side	(-)
CANV - Pin 2	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.	GO to HX64.

HX40 DTCS P0461, P0462 AND P0463: CHECK THE INSTRUMENT CLUSTER (IC) FOR DTCS

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

Are any DTCs present?

Yes	No
REFER to the INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES , to continue diagnosis.	GO to HX41.

HX41 CHECK THE FLI PID

Access the PCM and monitor the FLI PID.

Does the FLI PID match the fuel gauge?

Yes	No
GO to HX42.	GO to HX64.

HX42 DTC P0460: CHECK FOR FUEL TANK FLOAT LEVEL RESPONSE

Ignition ON, engine OFF.
Access the PCM and monitor the FLI PID.
Ignition OFF.
If the fuel level is less than 1/4 (25% on FLI), add approximately 1/4 tank of fuel.
If the fuel level is greater than 3/4 (75% on FLI), drain approximately 1/4 tank of fuel.
Ignition ON, engine OFF.

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 , to DIAGNOSE the incorrect fuel gauge indication symptom.

HX43 DTCS P0455 OR P0457: CHECK THE CAPLESS FUEL TANK FILLER PIPE

NOTE: If the capless fuel tank filler pipe is suspected as an EVAP leak source during visual inspection, do not disturb the capless fuel tank filler pipe until the repair verification method is complete. If the repair verification method fails, install and remove the supplemental refueling adaptor provided with the vehicle to reseal the capless fuel tank filler pipe and repeat the test. This action isolates the capless fuel tank filler pipe from the rest of the EVAP system as a potential concern.

Visually inspect the capless fuel tank filler pipe inlet without initially disturbing it.
- Check the capless fuel tank filler pipe inlet for an obstruction that prevents it from sealing.
- Check the capless fuel tank filler pipe for damage.

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 HX49.	GO to HX44.

HX44 CHECK FOR FLI DTCS

Ignition ON, engine OFF.
Carry out the 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 HX45.

HX45 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 an FLI concern.

Check the operation of the fuel gauge.

Is the fuel gauge functioning properly?

Yes	No
GO to HX46.	CHECK the functionality of the FLI circuit. REFER to the INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES , to DIAGNOSE the incorrect fuel gauge indication symptom.

HX46 EVAPORATIVE EMISSION SYSTEM VISUAL INSPECTION

Ignition OFF.
Visually inspect for:
- EVAP system lines/hoses (check for proper connections, damage or blockage)
- loose fuel vapor hose/tube connections to the EVAP system components
- blocked vacuum hose between the EVAP canister purge valve and the engine intake manifold
- damaged fuel tank or fuel filler pipe

Are any concerns present during the visual inspection?

Yes	No
REPAIR as necessary. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX49.	GO to HX47.

HX47 CHECK THE FTP SENSOR VOLTAGE WITH THE CAPLESS FUEL TANK FILLER PIPE OPEN

Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
Ignition ON, engine OFF.
Access the PCM and monitor the FTP PID.

Is the voltage between 2.4 - 2.8 V?

Yes	No
GO to HX48.	INSTALL a new FTP sensor. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX49.

HX48 EVAPCP VALVE TEST

NOTE: Access the fuel vapor vent valve and verify it is not stuck closed before continuing.

Ignition OFF.
Remove the supplemental refueling adaptor.
Ignition ON, engine running.
Access the PCM and control the EVAPCV PID.
Close the CV solenoid by commanding the EVAPCV PID to a 100% duty cycle.
Access the PCM and control the EVAPCP PID.
Access the PCM and monitor the FTP PID.
While monitoring the FTP PID, open the EVAPCP by commanding the EVAPCP to a 100% duty cycle.

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

Yes	No
GO to HX49.	INSTALL a new EVAPCP valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX49.

HX49 DTCS P0442 OR P0456: HOOK UP THE SMOKE MACHINE

NOTE: The smoke and air flow from the smoke machine will not pass through liquid fuel. Liquid fuel may be present in the fuel tank filler pipe.

NOTE: Use a suitable hose adapter in the following diagnostic procedures.

Ignition OFF.
Connect the smoke machine power cables to the vehicle battery. Check to see that the smoke machine power indicator lamp is on, indicating a good battery contact.
Disconnect the fuel vapor to EVAP canister line at the EVAP canister purge valve.
Connect a suitable hose adapter to the fuel vapor to EVAP canister line at the EVAP canister purge valve.

Is the smoke machine hook up complete?

Yes	No
For leak detection, GO to HX50. For leak repair verification, GO to HX51.	REFER to the smoke machine operator manual for additional instructions and for helpful tips.

HX50 CARRY OUT SMOKE MACHINE PHASE 2 - LEAK DETECTION SMOKE TEST

NOTE: If the leak is not detected from the top, check the EVAP system for leaks from under the vehicle. Check the EVAP hoses, EVAP canister purge valve, CV solenoid, EVAP canister, fuel tank, fuel filler pipe, around the fuel tank area, and at the capless fuel tank filler pipe inlet. Wiggle the components and connections to simulate road bumps while looking for signs of leaking smoke. If the leak is in the fuel tank filler pipe between the check valve and the capless fuel tank filler pipe inlet, smoke under pressure may not reach the leak. If leaking smoke is not found, a thorough visual inspection of the fuel tank filler pipe and capless fuel tank filler pipe inlet should be done.

Position the control lever located on the smoke machine to SMOKE.
Install the supplemental refueling adaptor provided with the vehicle to open the capless fuel tank filler pipe.
Connect the smoke supply hose nozzle tip into the suitable hose adapter.
Ignition ON, engine OFF.
Access the PCM and control the EVAPCV PID.
Close the CV solenoid by commanding the EVAPCV PID to a 100% duty cycle.
Press the remote starter button on the smoke machine and verify the connection at the EVAP canister purge valve is correct and not leaking.
Press the remote starter button on the smoke machine. Smoke is then introduced into the EVAP system. If smoke does not exit the fuel tank filler pipe after the system is pressurized, command the EVAPCV PID open to allow air to purge the CV solenoid. Once smoke is seen at the CV solenoid, command the EVAPCV PID close.
- Remove the supplemental refueling adaptor once smoke is observed exiting the fuel tank neck area.
- Continue to introduce smoke into the system for 60 seconds to obtain pressure.
- 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 provided with the smoke machine to follow the EVAP system path and look for smoke exiting at the source of the leak.

Is the source of 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 HX51.	Test passed. CONNECT all the disconnected components. CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX51.

HX51 CARRY OUT SMOKE MACHINE PHASE 1 - LEAK VERIFICATION PRESSURE TEST

Position the control lever located on the smoke machine to METER.
Calibrate the smoke machine flowmeter using the 0.020 (DTC P0456) or 0.040 (DTC P0442) standard as follows:
- Insert the air supply hose (transparent hose) nozzle tip into the appropriate EVAP system standard located on the front of the smoke machine.
- Press the remote starter button on the smoke machine. Observe the position of the flowmeter indicator ball.
- Position the flowmeter red pointer flag so that it aligns with the measurement of the indicator ball.
- Release the button and remove the air supply hose nozzle tip from the EVAP system standard.
Connect the air supply hose (transparent hose) nozzle tip into the suitable hose adapter.
Ignition ON, engine OFF.
Access the PCM and control the EVAPCV PID.
Close the CV solenoid by commanding the EVAPCV PID to a 100% duty cycle.
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 smoke machine leak verification pressure test?

Yes	No
The test passed and no concerns are present. CLEAR the DTCs. REPEAT the self-test.	GO to HX50.

HX52 DTC P144A: CHECK FOR A BLOCKED FUEL VAPOR TUBE BETWEEN THE FTP SENSOR AND THE FUEL TANK

Ignition OFF.
Remove the fuel vapor tube assembly. Refer to the EVAPORATIVE EMISSIONS -- HYBRID .
Visually inspect the fuel vapor tube for a blockage between the FTP sensor and the connection to the fuel tank.
Visually inspect the connection at the fuel tank for a blockage.
Attempt to manually remove the blockage.

Is the blockage visible and can be removed?

Yes	No
REMOVE the blockage. INSTALL the Fuel Vapor Tube assembly. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.	INSTALL a new Fuel Vapor Tube assembly. REFER to the EVAPORATIVE EMISSIONS -- HYBRID . CLEAR the DTCs. REPEAT the self-test.

HX53 DTC P2418: CHECK THE PCM OUTPUT TO FUEL VAPOR VENT VALVE

NOTE: The EVBV PID indicates 100% with the fuel vapor vent valve off, and 0% with the fuel vapor vent valve on.

Ignition OFF.
Fuel Vapor Vent Valve connector disconnected.

Connect a non-powered test lamp between:

Point A Fuel Vapor Vent Valve Connector, Harness Side	Point B Fuel Vapor Vent Valve Connector, Harness Side
VPWR - Pin 2	FVVV - Pin 1

Ignition ON, engine OFF.
Access the PCM and control the EVBV PID.
Close the fuel vapor vent valve by commanding the EVBV PID to 100%.

Does the test lamp turn on and off when the output(s) is commanded on and off?

Yes	No
GO to HX54.	GO to HX55.

HX54 CHECK THE FUEL VAPOR VENT VALVE SOLENOID RESISTANCE

Ignition OFF.

Measure the resistance between:

(+) Fuel Vapor Vent Valve Connector, Component Side	(-) Fuel Vapor Vent Valve Connector, Component Side
VPWR - Pin 2	FVVV - Pin 1

Is the resistance between 25 - 28 ohms?

Yes	No
Unable to identify the concern at this time. GO to PINPOINT TEST Z .	INSTALL a new Fuel Vapor Vent valve. REFER to the EVAPORATIVE EMISSIONS -- HYBRIDc . CLEAR the DTCs. REPEAT the self-test.

HX55 CHECK THE VPWR VOLTAGE TO FUEL VAPOR VENT VALVE

Measure the voltage between:

(+) Fuel Vapor Vent Valve Connector, Harness Side	(-)
VPWR - Pin 2	Ground

Is the voltage greater than 10 V?

Yes	No
GO to HX56.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX56 CHECK THE FVVV CIRCUIT FOR AN OPEN IN THE HARNESS

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) Fuel Vapor Vent Valve Connector, Harness Side
FVVV - Pin B4	FVVV - Pin 1

Is the resistance less than 5 ohms?

Yes	No
GO to HX57.	REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

HX57 CHECK THE FVVV CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) PCM Connector, Harness Side	(-)
FVVV - Pin B4	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to HX58.	REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.

HX58 CHECK THE FVVV CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS

Ignition ON, engine OFF.

Measure the voltage between:

(+) Fuel Vapor Vent Valve Connector, Harness Side	(-)
FVVV - Pin 1	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. CLEAR the DTCs. REPEAT the self-test.	GO to HX64.

HX59 CONTINUOUS MEMORY DTC P2450: CHECK FOR A STUCK OPEN FUEL VAPOR VENT VALVE

Disconnect the fuel vapor vent valve and inspect for damaged or pushed out pins, corrosion, and loose wires.
Check for kinks or bends in the fuel vapor hoses/tubes from the fuel vapor vent valve to the fuel tank.

Are there any concerns with the wiring or the fuel vapor vent valve connection?

Yes	No
REPAIR as necessary. CARRY OUT an evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	INSTALL a new Fuel Vapor Vent valve. CARRY OUT an evaporative emission leak check monitor repair verification drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .

HX60 DTC P260F: 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 Workshop Information Article to diagnose the communication DTC.	GO to HX61.

HX61 CHECK THE PERFORMANCE OF THE PROCESSOR

Ignition OFF.
Disconnect the battery and wait for 1 minute. Refer to the BATTERY, MOUNTING AND CABLES .
Connect the battery.
Ignition ON, engine running.
Allow the engine idle to stabilize.
Access the PCM and monitor the FTP PID.

Is the voltage between 2.35 - 2.9 V?

Yes	No
GO to HX63.	GO to HX62.

HX62 CHECK FOR SELF-TEST DTC P260F

Start the engine using the engine running diagnostic mode. Refer to DIAGNOSTIC MODES .
Idle the engine for 2 minutes.
Ignition OFF.
Ignition ON, engine OFF.
Retrieve the continuous memory DTCs.

Is DTC P260F present?

Yes	No
GO to HX63.	Return the vehicle to the customer.

HX63 CHECK THE PCM FOR THE LATEST CALIBRATION

Program the PCM to the latest calibration.
Start the engine using the engine running diagnostic mode. Refer to DIAGNOSTIC MODES .
Idle the engine for 2 minutes.
Ignition OFF.
Ignition ON, engine OFF.
Retrieve the continuous memory DTCs.

Is DTC P260F present?

Yes	No
GO to HX64.	Return the vehicle to the customer.

HX64 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 and 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.