Pinpoint Test N: The Check Fuel Cap Indicator Is Never On

N1 RETREIVE AND RECORD DTCS FROM CONTINUOUS AND ON-DEMAND SELF-TESTS-PCM
NOTE: Once the check fuel cap indicator does turn on, it does not turn off unless the fuel cap has been correctly secured and the vehicle has been driven for several minutes.
- Use recorded PCM DTCs from the continuous and on-demand self-test.
- Are any DTCs recorded?
1. Yes: If PCM DTC P0457, REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
2. No: GO to N2.
N2 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL III ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Connect the diagnostic tool.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster INDICATOR LAMP CONTROL III active command. Trigger the CHECK FUEL CAP active command ON. Observe the CHECK FUEL CAP indicator.
- Does the CHECK FUEL CAP indicator illuminate?
1. Yes: REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
2. No: GO to N3.
N3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
1. Yes: INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
2. No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.