Inspection and Verification: Notes
- Verify the customer concern is with the evaporative emission (EVAP) system.
- Visually inspect for the following obvious signs of mechanical damage.VISUAL INSPECTION CHART
Mechanical - Fuel filler cap
- EVAP test port
- EVAP canister or vent solenoid
- EVAP lines and hoses
- Vacuum lines or hoses
- Fuel filler cap seal
- Fuel filler neck seal surface
- If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
- Check that the program card is correctly installed.
- Check the connections to the vehicle.
- Check the ignition switch position.
- If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
- Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to MODULE COMMUNICATIONS NETWORK .
- NO RESP/NOT EQUIP for PCM, refer to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article.
- SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs).
- If the DTCs retrieved are related to the concern, go to the PCM DIAGNOSTICS TROUBLE CODE (DTC) INDEX to continue diagnostics.
- If the concern remains after the inspection, determine the symptom. GO to SYMPTOM CHART .