For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the instrument cluster diagnostic system check? | -- | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster
2 | Turn ON the ignition. Does the ENGINE OIL PRESSURE message display? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 |

1. Turn ON the ignition, with the engine OFF.
2. Install a scan tool.

With a scan tool, select the PCM IPC data list screen on the scan tool.

4. Check the engine oil pressure data value.

Does the engine oil pressure data value indicate low?

--

Go to Step 5

Go to Step 4

4 | Important: Perform the set up procedure for the replacement IPC. Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement and the set up procedure? | -- | Go to Step 10 | --
5 |

1. Turn OFF the ignition.
2. Disconnect the PCM connector C1.

Test for a short to ground in the signal circuit of the engine oil pressure indicator switch. Refer to Circuit Testing in Wiring Systems.

Is a short to ground present?

--

Go to Step 6

Go to Step 7

6 | Disconnect the engine oil pressure indicator switch. Is a short to ground still present? | -- | Go to Step 8 | Go to Step 9
7 | Important: Perform the reprogramming procedure for the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.4L. Did you complete the replacement and the set up procedure? | -- | Go to Step 10 | --
8 | Repair a short to ground in the signal circuit of the engine oil pressure indicator switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 10 | --
9 | Replace the engine oil pressure indicator switch. Refer to Engine Oil Pressure Sensor or Switch Replacement . Did you complete the repair? | -- | Go to Step 10 | --
10 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3