For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Oil Pressure Indicator Control | 2 | 1 | -- | -- |
Oil Pressure Switch Ground | -- | 1 | -- | -- |
1. Engine Oil Pressure Indicator Inoperative 2. Engine Oil Pressure Indicator Always On | ||||
Circuit Description
The engine oil pressure switch is a normally closed switch that opens with the proper oil pressure. With the ignition switch turned ON and the engine not running, ignition voltage is supplied to the oil pressure indicator, the oil pressure switch will be closed and the indicator will be grounded. With the engine running, the pressure switch opens and the indicator will turn off.
Reference Information
Schematic Reference
Connector End View Reference
Displays and Gages Connector End Views
Description and Operation
Electrical Information Reference
Circuit/System Verification
- Ignition ON, engine OFF, verify the low oil pesewa indicator is ON.
- Engine running, verify the low oil pressure indicator is OFF.
| ⇒ | If not the specified value refer to the following: |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the engine oil pressure switch.
- Ignition ON, verify the low oil pressure indicator is OFF.
- Ignition ON, install a 3A fused jumper wire between the indicator control circuit terminal and ground. Verify the low oil pressure indicator is ON.
- If all circuits test normal, test or replace the engine oil pressure switch.
| ⇒ | If not the specified value, test the indicator control circuit for a short to ground. If the circuit tests normal replace the IPC. |
| ⇒ | If not the specified value, test the signal circuit for an open/high resistance. If circuit tests normal, replace the low oil pressure indicator bulb. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for IPC replacement, programming, and setup |
