Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The instrument panel cluster (IPC) displays the vehicle speed based on the information from the engine control module (ECM) or the powertrain control module (PCM). The IPC receives a serial data message from the ECM/PCM indicating the vehicle speed.

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Instrument Panel, Gages, and Console Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Important: The drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear.

1. Start the engine, raise the vehicle drive wheels 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.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming.