Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The powertrain control module (PCM) / engine control module (ECM) monitors the cruise control switch. When the cruise on/off switch is switched ON, the cruise control switch is closed and the signal circuit is high. When the cruise on/off switch is switched OFF, the cruise control switch is open and the signal circuit is low.
Reference Information
Schematic Reference
Connector End View Reference
| • | Engine Control Module Connector End Views (non 4.2L) |
Description and Operation
Cruise Control Description and Operation
Electrical Information Reference
| • | Circuit Testing |
| • | Wiring Repairs |
Scan Tool Reference
Circuit/System Verification
Important: Vehicles without a driver information center (DIC) do not have a cruise control indicator in the instrument panel cluster (IPC). Do not perform this diagnostic if the vehicle does not have a DIC.
- Ignition ON, install a scan tool and command the Cruise Control Lamp Test ON. Verify that the cruise control indicator in the IPC is illuminated.
- If all circuits test normal, replace the ECM / PCM.
| ⇒ | If the indicator is not illuminated, replace the IPC. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for PCM (4.2L) / ECM (non 4.2L) or IPC replacement, setup, and programming.
