For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
SCHEMATIC REFERENCE: Engine Controls Schematics (2.4L) or Engine Controls Schematics (3.4L) in Engine Controls
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, with the engine OFF. Does the engine oil pressure indicator illuminate during the bulb check? | -- | Go to Step 3 | Go to Step 9
3 |

1. Turn OFF the ignition.
2. Disconnect the engine oil pressure sensor.
3. Connect a fused jumper wire between the signal circuit of the engine oil pressure sensor and a good ground.
4. Install a scan tool.
5. Turn ON the ignition, with the engine OFF.
6. With a scan tool, observe the Engine Oil Pressure parameter in the PCM data list.

Does the scan tool display Low?

--

Go to Step 5

Go to Step 4

4 | Test the signal circuit of the engine oil pressure sensor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6
5 | Inspect the ground circuit of the engine oil pressure sensor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 7
6 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8
7 | Inspect for poor connections at the harness connector of the engine oil pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10
8 | Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement (2.4L) or Powertrain Control Module Replacement/Programming (3.4L) in Engine Controls. Did you complete the replacement? | -- | Go to Step 11 | --
9 | Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement? | -- | Go to Step 11 | --
10 | Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor and/or Switch Replacement (2.4L) or Engine Oil Pressure Sensor and/or Switch Replacement (3.4L) in Engine Controls. Did you complete the replacement? | -- | Go to Step 11 | --
11 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2