P0568

DTC P0568

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC P0568 00
- Cruise Control Set Switch Circuit




Diagnostic Fault Information






Circuit/System Description

The cruise control switch is an input to the engine control module (ECM)/powertrain control module (PCM). The ECM/PCM monitors the cruise control switch signal circuit in order to detect when a cruise control function switch has been requested. The ECM/PCM detects a predetermined voltage signal when a cruise control function switch is applied, with each switch having a different voltage value.


Conditions for Running the DTC

* The ignition is ON.
* The cruise control switch is ON.



Conditions for Setting the DTC

The ECM detects that the set/coast switch is applied for longer than 90 seconds.


Action Taken When the DTC Sets

* The ECM/PCM stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The ECM/PCM records the operating conditions at the time the diagnostic fails. The ECM/PCM stores this information in the Failure Records.
* The cruise control system is disabled.



Conditions for Clearing the DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 malfunction-free warm-up cycles.



Diagnostic Aids

Ensure that the set/coast switch is not stuck or sticking in the applied position.


Reference Information
Schematic Reference

Cruise Control Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Cruise Control Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

Ignition ON, Cruise Control Switch ON, verify that the Cruise Set/Coast Switch parameter reads Inactive (OFF). The switch parameter should change to Active (ON) and back to Inactive (OFF) as the switch is pressed and released.


Circuit/System Testing

1. Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement (Service and Repair).
2. Disconnect the cruise control switch.
3. Ignition ON, cruise control switch ON, verify that the scan tool Cruise Set/Coast Switch parameter displays Off or Inactive.

• If the scan tool parameter reads On, Active or Invalid, test the cruise control switch signal circuit for a short to voltage. If the circuit tests normal, replace the ECM/PCM.

4. If all circuits test normal, replace the cruise control switch assembly.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for ECM or PCM replacement, setup, and programming