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. |
Circuit/System Description
The engine control module (ECM) determines when the engine oil should be changed and calculates the oil life in percent. The ECM sends this information via the serial data circuit to the body control module (BCM). The instrument panel cluster (IPC) receives this information from the BCM through the serial data circuit and illuminates the oil level percent in the driver information center (DIC). The IPC will illuminate the CHANGE ENGINE OIL message when the oil needs to be changed.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify the scan tool Engine Oil Life Remaining parameter is greater than 0 percent.
- If the percent value is normal, replace the IPC.
| ⇒ | If less than the specified range, reset the engine oil life. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PCM or IPC replacement, setup, and programming |
