Diagnostic Instructions
Circuit/System Description
This diagnostic procedure applies to serial data gages located in the instrument panel cluster (IPC) which may include the speedometer, tachometer, engine coolant temperature gage and volt gage if equipped.
Reference Information
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Important: If the suspect gage is the speedometer, the drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to
Lifting and Jacking the Vehicle.
- Ignition ON, with the scan tool perform the IPC Gage Sweep Test in the IPC Output Controls. Verify that all gage dials move from minimum to the maximum value and back to the gage minimum value.
⇒ | If the gages do not perform the IPC Gage Sweep Test, replace the IPC. |
- Start the engine with the vehicle drive wheels raised and place the transmission in drive or first gear. Verify that the speedometer value matches the scan tool Vehicle Speed parameter in the ECM Engine Data List.
⇒ | If the speedometer is incorrect, test or replace the IPC. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the IPC replacement, setup and programming