0961

0961- EVAP SYSTEM - LOOSE FUEL CAP





For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

Fuel level is recorded when the ignition key is turned off and is compared to the fuel level when the ignition key is turned back on. The PCM recognizes an increase in fuel level and will fail the Medium leak test because the fuel cap is broken or not installed properly. GAS CAP will be displayed in odometer to inform the owner that the cap is off of loose.

- When Monitored:
Engine running. Ambient Temperature between 4° C and 32° C (39° F and 89° F) Close Loop fuel system. Test runs after the medium leak test is inconclusive and the PCM has senses a fuel increase.

- Set Condition:
If a leak greater than.090" is detected by the PCM for two consecutive cold start trips after a significant fuel level change, this DTC will set. One good trip turns off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. DTC IS ACTIVE
NOTE: If DTC 1085-EVAP SYSTEM LARGE LEAK is set along with this DTC, perform the diagnostic procedure for 1085 before continuing with this test. 1085

NOTE: Do not replace the gas cap for DTC 0961-EVAP SYSTEM - LOOSE FUEL CAP.

With a scan tool, select View DTCs.
Is the status Active or Pending for DTC 1085-EVAP SYSTEM LARGE LEAK along with this DTC?

Yes

- Perform the diagnostic procedure for 1085-EVAP SYSTEM LARGE LEAK.

No

- No repair is necessary. Verify that the gas cap is in place and tight. Clear DTCs and follow the directions outlined under Instrument Cluster on resetting the odometer or message center display.