P0568
DTC P0568
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0568
- Cruise Control Set Switch Circuit
Diagnostic Fault Information
Circuit/System Description
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.
Conditions for Running the DTC
* The ignition is ON.
* The cruise control switch is ON.
Conditions for Setting the DTC
The ECM detects the Set/Coast switch is applied for greater than 90 seconds.
Actions Taken When the DTC Sets
* The malfunction indicator lamp (MIL) will not illuminate.
* The cruise control system is disabled.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Cruise Control Schematics ([1][2]Cruise Control)
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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
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.
Circuit/System Testing
1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
2. Ignition ON, verify the scan tool Cruise Set/Coast Switch parameter displays Inactive.
• If not the specified value, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the ECM.
3. Install a 3A fused jumper wire between the signal circuit terminal C and the ignition circuit terminal A. Verify the scan tool Cruise Set/Coast Switch parameter displays Active.
• 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.
4. If all circuits test normal, test or replace the turn signal/multifunction switch.
Component Testing
1. Ignition OFF, disconnect the X4 harness connector at the turn signal/multifunction switch.
2. Turn the cruise control switch ON.
3. Test for infinite resistance between terminal A and terminal C at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
4. Press and hold the cruise Set/Coast switch. Test for less than 1 ohm between terminal A and terminal C at the turn signal/multifunction switch.
• If not the specified value, replace the turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)
* Control Module References (Programming and Relearning) for ECM replacement, setup, and programming