For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the IPC diagnostic system check? | -- | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster
2 |

1. Disconnect engine control module (ECM) connector C2.
2. Turn ON the ignition, with the engine OFF.

Is the FUEL CAP lamp illuminated?

--

Go to Step 3

Go to Step 4

3 | Test the control circuit of the fuel cap indicator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 5
4 | Replace the ECM. Refer to Engine Control Module Replacement/Programming . Did you complete the replacement? | -- | Go to Step 6 | --
5 | Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 6 | --
6 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2