• | 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 | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
B+ | 1 | 1 | 1 | -- | -- |
Cruise Control Resume/Accel. Switch Signal | 1 | -- | 1 | P0567 | -- |
Cruise Control Set/Coast Switch Signal | 1 | -- | 1 | P0568 | -- |
1. Cruise Control Malfunction |
The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control switch signal circuits in order to detect when a cruise control function switch has been activated. The ECM detects a voltage signal when a cruise control function switch is applied.
• | The ignition is ON. |
• | The cruise control switch is ON. |
The ECM detects the Set/Coast switch is applied for greater than 90 seconds.
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The cruise control system is disabled. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear after 40 malfunction-free ignition cycles have occurred. |
Cruise Control Description and Operation
Control Module References for scan tool information
Ignition ON, observe the scan tool Cruise Set/Coast Switch parameter while pressing and depressing the Set/Coast switch. The reading should change between Inactive and Active.
⇒ | If not the specified value, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If not the specified value, replace the turn signal/multifunction switch. |
⇒ | If not the specified value, replace the turn signal/multifunction switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |