Diagnostic Procedure

DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	Connect the WDS or equivalent to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE ).
1		No	No DTC is displayed: Go to the next step.
2	Remove the fuel-filler pipe. Make sure the non return valve is installed properly. Inspect non return valve operation. Is the non return valve normal?	Yes	Inspect for the following: Improper use of fuel nozzle Inadequate fuel filling speed
2		No	Non return valve is installed improperly: Reinstall non return valve to proper position. Non return valve does not operate properly: Replace non return valve.
3	Verify test results. If normal, return to diagnostic index to service any additional symptoms. (See ENGINE SYMPTOM TROUBLESHOOTING ). If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION ).