Test Procedure

HX1 DTC P0443: CHECK THE PCM OUTPUT TO EVAP CANISTER PURGE VALVE

Key in OFF position.
EVAPCP Valve connector disconnected.
Connect a non-powered test lamp between the EVAPCP and VPWR circuits at the EVAP canister purge valve harness connector.
Key in ON position.
Enter output test mode. Refer to OUTPUT TEST MODE (OTM) .
Command the outputs ON.
Command the outputs OFF.
Exit output test mode.

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

Yes	No
Key in OFF position. GO to HX2.	GO to HX5.

HX2 TYPE OF EVAP CANISTER PURGE VALVE

Typical EVAP Canister Purge Valve (with vacuum diaphragm).

Fig 1: Type Of EVAP Canister Purge Valve - With Vacuum Diaphragm (1 Of 2)
Courtesy of FORD MOTOR CO.

Fig 2: Type Of EVAP Canister Purge Valve - With Vacuum Diaphragm (2 Of 2)
Courtesy of FORD MOTOR CO.
Typical Electronic EVAP Canister Purge Valve.

Fig 3: Typical Electronic EVAP Canister Purge Valve
Courtesy of FORD MOTOR CO.

Are you testing an electronic EVAP canister purge valve?

Yes	No
Key in OFF position. GO to HX3.	Key in OFF position. GO to HX4.

HX3 CHECK THE EVAP CANISTER PURGE VALVE SOLENOID RESISTANCE

NOTE: The EVAP canister purge valve resistance reading must be taken with the engine cooled down.

EVAPCP Valve connector disconnected.

Measure the resistance between:

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

Is the resistance between 2.5 ohms - 6 ohms?

Yes	No
Unable to identify the fault at this time. GO to PINPOINT TEST Z STEP 1 .	INSTALL a new EVAPCP valve.

HX4 CHECK THE EVAP CANISTER PURGE VALVE SOLENOID RESISTANCE

NOTE: The EVAP canister purge valve resistance reading must be taken with the engine cooled down.

EVAPCP Valve connector disconnected.

Measure the resistance between:

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

Is the resistance between 30 ohms - 38 ohms?

Yes	No
Unable to identify the fault at this time. GO to PINPOINT TEST Z STEP 1 .	INSTALL a new EVAPCP valve.

HX5 CHECK THE VPWR VOLTAGE TO EVAP CANISTER PURGE VALVE

Key in ON position.

Measure the voltage between:

(+) EVAPCP Valve Connector, Harness Side	(-) Vehicle Battery
VPWR - Pin 1	Negative terminal

Is the voltage greater than 10.5 V?

Yes	No
Key in OFF position. GO to HX6.	REPAIR the open circuit.

HX6 CHECK THE EVAP CANISTER PURGE VALVE CIRCUIT FOR AN OPEN IN THE HARNESS

Key in OFF position.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) EVAPCP Valve Connector, Harness Side
EVAPCP	EVAPCP - Pin 2

Is the resistance less than 5 ohms?

Yes	No
GO to HX7.	REPAIR the open circuit.

HX7 CHECK THE EVAP CANISTER PURGE VALVE CIRCUIT FOR A SHORT TO PWRGND IN THE HARNESS

Diagnostic tool connector disconnected.

Measure the resistance between:

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

Is the resistance greater than 10K ohms?

Yes	No
GO to HX8.	REPAIR the short circuit to GND.

HX8 CHECK THE EVAP CANISTER PURGE VALVE CIRCUIT FOR A SHORT TO POWER IN THE HARNESS

Key in ON position.

Measure the voltage between:

(+) EVAPCP Valve Connector, Harness Side	(-)
EVAPCP - Pin 2	Ground

Is the voltage less than 1 V?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the short circuit to PWR.

HX9 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 EVAPORATIVE EMISSIONS and FUEL TANK AND LINES for removal instructions.

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 fault indicated?

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 HX10.

HX10 CHECK THE FUEL TANK PRESSURE SENSOR VOLTAGE WITH THE FUEL FILLER CAP REMOVED

Remove the fuel filler cap.
Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage between 2.4 V - 2.8 V?

Yes	No
GO to HX14.	Key in OFF position. GO to HX11.

HX11 CHECK FOR ANY OTHER DTCS

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

Are any other DTCs present?

Yes	No
DISREGARD the current diagnostic trouble code (DTC) at this time. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS .	Key in OFF position. GO to HX12.

HX12 CHECK THE VREF VOLTAGE TO FUEL TANK PRESSURE SENSOR

FTP Sensor connector disconnected.
Key in ON position.

Measure the voltage between:

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

Is the voltage between 4 V - 6 V?

Yes	No
Key in OFF position. INSTALL a new FTP sensor. 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 .	Key in OFF position. GO to HX13.

HX13 CHECK THE VREF AND SIGRTN CIRCUIT FOR AN OPEN IN THE HARNESS

PCM connector disconnected.

Measure the resistance between:

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

Are the resistances less than 5 ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the open circuit.

HX14 CHECK IF THE ENGINE WILL IDLE

Key on engine running.

Does the engine stall or cannot maintain idle?

Yes	No
Key in OFF position. GO to HX15.	GO to HX16.

HX15 CHECK THE EVAP SYSTEM FOR A STUCK OPEN VALVE

Disconnect the larger of 2 manifold lines at the EVAPCP and cap it at the EVAPCP.
Key on engine running.

Does the engine stall or cannot maintain idle?

Yes	No
Key in OFF position. The EVAP system is not the cause of the symptom. Concern is elsewhere. RETURN to SYMPTOM CHARTS - GASOLINE MODELS for further direction.	Key in OFF position. INSTALL a new EVAP Canister Purge Valve.

HX16 CHECK FOR BLOCKAGE IN THE FUEL TANK VENT SYSTEM

Key on engine running.
Access the PCM and monitor the EVAPPDC, EVMV, FTP V and EVAPCV PIDs.
While monitoring the FTP PID, open the EVAPCP by commanding the EVAPPDC PID to a 100% duty cycle (or EVMV PID to a 1, 000 mA). Ramp the EVAP canister purge valve open in increments.
NOTE: The EVAPCV is normally open and venting to the atmosphere.

Does the FTP sensor voltage drop below 2 volts when the EVAPCP valve is commanded fully open?

Yes	No
CHECK for blockage in the vapor line to the EVAPCV solenoid. CHECK the CV solenoid filter for blockage or contamination. CHECK the carbon canister for blockage. If OK, INSTALL a new EVAPCV.	GO to HX17.

HX17 CHECK THE EVAP SYSTEM FOR A STUCK OPEN VALVE

Key on engine running.
Close the EVAPCP by commanding the EVAPPDC PID to 0% duty cycle or the EVMV PID to 0 mA.
Close the EVAPCV by commanding the EVAPCV PID to ON (100% duty cycle).

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

Yes	No
Key in OFF position. INSTALL a new EVAP Canister Purge Valve.	GO to HX18.

HX18 EVAP CANISTER PURGE VALVE TEST

Key on engine running.
Close the EVAPCV by commanding the EVAPCV PID to ON (100% duty cycle).
While monitoring the FTP PID, open the EVAPCP by commanding the EVAPPDC PID to a 100% duty cycle (or EVMV PID to a 1, 000 mA).

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

Yes	No
Key in OFF position. For DTC P1450: No Fault Found. Problem may be intermittent. All others, check the EVAP system for leaks:	Key in OFF position. 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 EVAP canister purge valve.

HX19 DTC P0452: CHECK FOR FUEL TANK PRESSURE SENSOR CONNECTOR CONTAMINATION

Key in OFF position.
Visually check for liquid fuel contamination of the FTP sensor electrical connector.
Check for a completely submerged FTP sensor (tank-mounted type only) in the liquid fuel. This can affect the correct FTP voltage reading.

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

Yes	No
REPAIR as necessary. ADJUST the fuel tank overfill.	GO to HX20.

HX20 CHECK FOR LOW FTP SENSOR VOLTAGE

NOTE: The FTP sensor voltage with no pressure/vacuum on the fuel tank is between 2.4 and 2.8 volts.

Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage less than 0.22 V?

Yes	No
Key in OFF position. GO to HX21.	The fault that produced the DTC P0452 is intermittent. GO to PINPOINT TEST Z STEP 1 .

HX21 CHECK THE OPPOSITE INDUCED HIGH FTP SENSOR SIGNAL

FTP Sensor connector disconnected.
NOTE: If a diagnostic tool communication concern exists, immediately remove the jumper and follow the NO path in the RESULT/ACTION column.

Connect a 5 amp fused jumper wire between the following:

Point A FTP Sensor Connector, Harness Side	Point B FTP Sensor Connector, Harness Side
VREF	FTP

Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage between 4 V - 6 V?

Yes	No
INSTALL a new FTP sensor.	REMOVE the jumper. GO to HX22.

HX22 CHECK THE VREF VOLTAGE TO FTP SENSOR

Key in ON position.

Measure the voltage between:

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

Is the voltage between 4 V - 6 V?

Yes	No
Key in OFF position. GO to HX23.	GO to PINPOINT TEST C STEP 1 .

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

PCM connector disconnected.
Diagnostic tool connector disconnected.

Measure the resistance between:

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

Measure the resistance between:

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

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the short circuit.

HX24 DTC P0453: CHECK FOR HIGH FTP SENSOR VOLTAGE

NOTE: The FTP sensor voltage with no pressure/vacuum on the fuel tank is between 2.4 and 2.8 volts.

Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage greater than 4.5 V?

Yes	No
Key in OFF position. GO to HX25.	The fault that produced the DTC P0453 is intermittent. GO to PINPOINT TEST Z STEP 1 .

HX25 CHECK THE VOLTAGE BETWEEN THE VREF AND SIGRTN CIRCUITS AT THE FTP SENSOR VEHICLE HARNESS CONNECTOR

FTP Sensor connector disconnected.
Key in ON position.

Measure the voltage between:

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

Is the voltage between 4 V - 6 V?

Yes	No
GO to HX26.	GO to PINPOINT TEST C STEP 1 .

HX26 CHECK THE FTP CIRCUIT FOR A SHORT TO POWER

Measure the voltage between:

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

Is the voltage less than 10.5 V?

Yes	No
Key in OFF position. GO to HX28.	Key in OFF position. GO to HX27.

HX27 CHECK THE FTP CIRCUIT FOR A SHORT TO VPWR IN THE HARNESS

PCM connector disconnected.
Key in ON position.

Measure the voltage between:

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

Is the voltage greater than 10.5 V?

Yes	No
REPAIR the short circuit to PWR.	INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .

HX28 CHECK THE FTP CIRCUIT FOR AN OPEN IN THE HARNESS

PCM connector disconnected.

Measure the resistance between:

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

Is the resistance less than 5 ohms?

Yes	No
GO to HX29.	REPAIR the open circuit.

HX29 CHECK THE FTP CIRCUIT FOR A SHORT TO VREF

Measure the resistance between:

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

Is the resistance greater than 10K ohms?

Yes	No
GO to HX30.	REPAIR the short circuit to VREF.

HX30 CHECK THE OPPOSITE INDUCED LOW FTP SIGNAL

PCM connector connected.
Diagnostic tool connector connected.
NOTE: If a diagnostic tool communication concern exists, immediately remove the jumper and follow the NO path in the RESULT/ACTION column.

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	SIGRTN

Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage less than 0.1 V?

Yes	No
INSTALL a new FTP sensor.	INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .

HX31 DTCS P1451 OR P0446: CHECK THE PCM OUTPUT TO EVAP CANISTER VENT SOLENOID

NOTE: For applications that use the engine off natural vacuum (EONV) EVAP leak check monitor, B+ provides power to the CANV solenoid instead of VPWR.

Key in OFF position.
CANV connector disconnected.

Connect a non-powered test lamp between:

(+) CANV Connector, Harness Side	(-) CANV Connector, Harness Side
VPWR	CANV
B+	CANV

Key in ON position.
Enter output test mode. Refer to OUTPUT TEST MODE (OTM) .
Command the outputs ON.
Command the outputs OFF.
Exit output test mode.

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

Yes	No
Key in OFF position. GO to HX32.	GO to HX33.

HX32 CHECK THE CANV SOLENOID RESISTANCE

Measure the resistance between:

(+) CANV Connector, Component Side	(-) CANV Connector, Component Side
B+	CANV
VPWR	CANV

Are the resistances between 48 ohms - 65 ohms?

Yes	No
Unable to identify the fault at this time. GO to PINPOINT TEST Z step 1 .	INSTALL a new EVAPCV.

HX33 CHECK THE VPWR VOLTAGE TO CANV SOLENOID

Measure the voltage between:

(+) CANV Connector, Harness Side	(-)
B+	Ground
VPWR	Ground

Are the voltages greater than 10.5 V?

Yes	No
Key in OFF position. GO to HX34.	REPAIR the open circuit.

HX34 CHECK THE CANV CIRCUIT FOR AN OPEN IN THE HARNESS

PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) CANV Connector, Harness Side
CANV	CANV

Is the resistance less than 5 ohms?

Yes	No
GO to HX35.	REPAIR the open circuit.

HX35 CHECK THE CANV CIRCUIT FOR A SHORT TO PWRGND IN THE HARNESS

Diagnostic tool connector disconnected.

Measure the resistance between:

(+) CANV Connector, Harness Side	(-) Vehicle Battery
CANV	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
GO to HX36.	REPAIR the short circuit to GND.

HX36 CHECK THE CANV CIRCUIT FOR A SHORT TO POWER IN THE HARNESS

Key in ON position.

Measure the voltage between:

(+) CANV Connector, Harness Side	(-)
CANV	Ground

Is the voltage less than 1 V?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the short circuit to PWR.

HX37 DTCS P0460, P0461, P0462 OR P0463: CHECK THE FLI CIRCUIT VOLTAGE

Key on engine running.
Access the PCM and monitor the FLI V PID.

Is the voltage between 0.25 V - 4.5 V?

Yes	No
GO to HX38.	GO to HX39.

HX38 CHECK FOR FUEL TANK FLOAT LEVEL RESPONSE

Key in ON position.
Access the PCM and monitor the FLI V PID.
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.

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

Yes	No
No Fault Found. Problem may be intermittent. GO to PINPOINT TEST Z STEP 1 .	Key in OFF position. REFER to INSTRUMENT CLUSTER to continue inoperative fuel level sender diagnosis.

HX39 CHECK THE FLI CIRCUIT AT THE FP MODULE

Instrument cluster connector disconnected. REFER to INSTRUMENT CLUSTER or SYSTEM WIRING DIAGRAMS for the cluster connector configuration.
Gain access to the fuel pump connector or intermediate fuel pump connector.
FP connector disconnected.
Key in ON position.

Measure the voltage between:

(+) FP Connector, Harness Side	(-) Vehicle Battery
FLI	Negative terminal

Is the voltage greater than 5 V?

Yes	No
Key in OFF position. GO to HX40.	Key in OFF position. GO to HX41.

HX40 CHECK THE FLI CIRCUIT FOR A SHORT TO POWER IN THE HARNESS

PCM connector disconnected.
Key in ON position.

Measure the voltage between:

(+) FP Connector, Harness Side	(-) Vehicle Battery
FLI	Negative terminal

Is the voltage greater than 10.5 V?

Yes	No
REPAIR the short circuit to PWR.	INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .

HX41 CHECK THE FLI CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS

PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) Vehicle Battery
FLI	Negative terminal

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) PCM Connector, Harness Side
FLI	CASE GND

Are the resistances greater than 10 K Ohms?

Yes	No
GO to HX42.	REPAIR the short circuit to GND.

HX42 CHECK THE FLI CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) IC Connector, Harness Side
FLI	FLI

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) FP Connector, Harness Side
FLI	FLI

Are the resistances less than 5 Ohms?

Yes	No
GO to HX43.	REPAIR the open circuit.

HX43 CHECK THE CASE GROUND CIRCUIT FOR AN OPEN IN THE HARNESS

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) FP Connector, Harness Side
CASE GND	CASE GND

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) IC Connector, Harness Side
CASE GND	GND

Are the resistances less than 5 Ohms?

Yes	No
REFER to INSTRUMENT CLUSTER to diagnose the instrument cluster. If OK, INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the open circuit.

HX44 FUEL CAP INDICATOR LAMP ALWAYS ON WITHOUT DTCS

PCM connector disconnected.
Key in ON position.

Is the fuel cap indicator lamp OFF with the PCM disconnected?

Yes	No
Key in OFF position. INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The PCM has not caused the fuel cap indicator lamp to turn ON. REFER to INSTRUMENT CLUSTER to diagnose an always on fuel cap indicator lamp.

HX45 FUEL CAP INDICATOR LAMP ALWAYS OFF WITHOUT DTCS

Key in OFF position.
Instrument cluster connector disconnected. REFER to INSTRUMENT CLUSTER or SYSTEM WIRING DIAGRAMS for the cluster connector configuration.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) IC Connector, Harness Side
FCIL	FCIL

Is the resistance less than 5 ohms?

Yes	No
REFER to INSTRUMENT CLUSTER to diagnose a never on fuel cap indicator lamp. If the instrument cluster is OK, INSTALL a new PCM. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	REPAIR the open circuit. VERIFY the repair by turning the key to the ON position. (The lamp will turn OFF in 3 seconds).

HX46 DTC P0451: CLEAR AND ATTEMPT TO RETRIEVE THE DTC

Key in ON position.
CLEAR continuous memory DTCs.
Key on engine running.
Run the engine for approximately 10 seconds.
Retrieve Continuous Memory DTCs.

Is DTC P0451 present in continuous memory?

Yes	No
Key in OFF position. CHECK the PCM and FTP sensor connector for any signs of damage, rust, or pushed out pins. Make sure all connectors are securely connected. If OK, INSTALL a new FTP sensor. CLEAR continuous memory DTCs. Retest If DTC P0451 is still present, INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	The fault that produced the DTC P0451 is intermittent. GO to PINPOINT TEST Z STEP 1 .

HX47 DTCS P0455 OR P0457: CHECK THE FUEL FILLER CAP

NOTE: Many EVAP leaks are caused by a loose or damaged fuel filler cap. If the fuel filler cap is suspect during visual inspection, do not disturb the fuel filler cap until the repair verification method is complete. If the repair verification method fails, reposition or install a new fuel filler cap and repeat the test. This action isolates the fuel filler cap from the rest of the EVAP system as a potential concern.

Visually inspect the fuel filler cap without initially disturbing it.
Check for missing or loose fuel filler cap.
Check the fuel filler cap for damage.

Is a concern present with the proper installation of the fuel filler cap?

Yes	No
For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. CONNECT or INSTALL a new fuel filler cap. GO to HX52.	GO to HX48.

HX48 CHECK 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 fault.

Check operation of the fuel gauge.

Is the fuel gauge functioning properly?

Yes	No
Key in OFF position. GO to HX49.	Key in OFF position. CHECK the functionality of the FLI circuit. Concern is elsewhere. RETURN to SYMPTOM CHARTS - GASOLINE MODELS for further direction.

HX49 DTC P1443: EVAPORATIVE EMISSION SYSTEM VISUAL INSPECTION

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.
- The vacuum line from the input vacuum port to the intake manifold on the EVAP canister purge valve (the control vacuum solenoid part of the valve) is removed.
- Blocked vacuum hose between the EVAP canister purge valve solenoid and the engine intake manifold.
- Damaged fuel tank or fuel filler pipe.

Are there any concerns found 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 HX52.	GO to HX50.

HX50 CHECK THE FUEL TANK PRESSURE SENSOR VOLTAGE WITH THE FUEL FILLER CAP REMOVED

Remove the fuel filler cap.
Key in ON position.
Access the PCM and monitor the FTP V PID.

Is the voltage between 2.4 V - 2.8 V?

Yes	No
CONNECT the fuel filler cap. GO to HX51.	Key in OFF position. INSTALL a new FTP sensor. REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX52.

HX51 EVAP CANISTER PURGE VALVE TEST

Key on engine running.
Access the PCM and monitor the EVAPCV, EVAPPDC, EVMV and FTP V PIDs.
Close the EVAPCV by commanding the EVAPCV PID to ON (100% duty cycle).
While monitoring the FTP PID, open the EVAPCP by commanding the EVAPPDC PID to a 100% duty cycle (or EVMV PID to a 1, 000 mA).

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

Yes	No
Key in OFF position. GO to HX52.	Key in OFF position. INSTALL a new EVAPCP valve. REPEAT the test and VERIFY the results. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX52.

HX52 DTCS P0442 OR P0456: HOOK UP THE SMOKE MACHINE (ROTUNDA VACUTEC)

CAUTION: Removing the Schrader valve from the test port on vehicles equipped with electronic EVAPCP permanently damages the valve.

Disconnect the larger of 2 manifold lines at the EVAPCP and cap it at the EVAPCP.
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.
Locate the evaporative emission test port and remove the green cap. It is located on or close to the EVAPCP.
For vehicles equipped with the vacuum diaphragm type EVAPCP, remove the Schrader valve from the evaporative emission test port by turning it in a clockwise rotation. Do not remove the Schrader valve from vehicles equipped with an electronic type EVAPCP. Refer to the illustration in step HX2 for evapcp type identification.
Install the EVAP test port adapter (provided with the Vacutec Smoke Machine) to the test port.
Diagnostic tool connected.

Is the smoke machine hook up complete?

Yes	No
For leak detection, GO to HX53. For leak repair verification, GO to HX54.	Key in OFF position. REFER to the smoke machine operator manual for additional instructions and for helpful tips.

HX53 CARRY OUT SMOKE MACHINE PHASE 2 - LEAK DETECTION SMOKE TEST

Position the control lever located on the smoke machine to SMOKE.
Remove the fuel filler cap.
Connect the smoke supply hose (black hose) nozzle tip into the EVAP service port adapter.
Key in ON position.
Close the EVAPCV by commanding the EVAPCV PID to ON (100% duty cycle). Note: The EVAPCV reopens after 9 minutes of continuous operation.
Press the remote starter button on the smoke machine. Smoke will be introduced into the EVAP system.
- Secure the fuel cap once smoke is observed exiting the fuel tank neck area.
NOTE:
If smoke does not exit the fuel filler neck after the system is pressurized, command the EVAPCV open to allow air to purge the canister vent solenoid. Once smoke is seen at the canister vent solenoid, close the EVAPCV.
- 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(s).

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

Is the source of the EVAP leak located?

Yes	No
Key in OFF position. REPAIR as necessary. CONNECT all the disconnected components. For repair verification, CARRY OUT the Smoke Machine PHASE 1 - Leak Verification Pressure Test. GO to HX54.	Key in OFF position. Test passed. CONNECT all the disconnected components. CARRY OUT Smoke Machine PHASE 1 - Leak Verification Pressure Test GO to HX54.

HX54 CARRY OUT THE SMOKE MACHINE PHASE 1 - LEAK VERIFICATION PRESSURE TEST

Position the control lever located on the smoke machine to METER.
Calibrate the smoke machine flow meter using the 0.020 standard as follows:
- Insert the air supply hose (transparent hose) nozzle tip into the 0.020 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 flow meter indicator ball.
- Position the flow meter 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 EVAP test port adapter.
Key in ON position.
Close the EVAPCV by commanding the EVAPCV PID to ON (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
Key in OFF position. Test passed, no faults found.	GO to HX53.

HX55 DTC P260F: CHECK FOR THE PRESENCE OF ANY MODULE COMMUNICATION CONCERNS

Key in ON position.
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. ADDRESS the next DTC. GO to POWERTRAIN DTC CHARTS AND DESCRIPTIONS - GASOLINE MODELS . For communication concerns in other modules: REFER to the applicable service information article to diagnose the communication DTC.	GO to HX56.

HX56 CHECK THE PERFORMANCE OF THE PROCESSOR

Key in OFF position.
Disconnect the battery and wait for 1 minute.
Connect the battery.
Key on engine running.
Allow the engine idle to stabilize.
Access the PCM and monitor the FTP PID.

Is the pressure equal to 0 kPa (0 psi)?

Yes	No
GO to HX58.	GO to HX57.

HX57 CHECK FOR SELF-TEST DTC

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

Is DTC P260F present?

Yes	No
GO to HX58.	RETURN the vehicle to the customer.

HX58 CHECK THE PCM FOR THE LATEST CALIBRATION

Program the PCM to the latest calibration.
Key on engine running.
Idle the engine for 2 minutes.
Carry out the self-test.

Is DTC P260F present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) .	RETURN the vehicle to the customer.