DTC Descriptor
DTC P0568 00 : Cruise Control Set Switch CircuitDiagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Cruise Control Set / Coast Switch Signal | Cruise Control Inoperative / Malfunctioning | Cruise Control Inoperative / Malfunctioning | P0568 00 | -- |
Circuit/System Description
The cruise control set/coast switch is an input to the powertrain control module (PCM)/engine control module (ECM). The PCM/ECM uses the cruise control set/coast switch signal circuit in order to detect when the driver has requested to set the vehicle speed or to decelerate the vehicle speed. The PCM/ECM detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied. This DTC sets if the PCM/ECM senses voltage on the cruise control set/coast switch signal circuit for longer than 90 seconds.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The cruise control On/Off switch is ON. |
Conditions for Setting the DTC
The PCM/ECM detects the set/coast switch is ON for longer than 90 seconds.
Action Taken When the DTC Sets
| • | The PCM/ECM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM/ECM records the operating conditions at the time the diagnostic fails. The PCM/ECM 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 50 malfunction-free warm-up cycles. |
| • | The PCM/ECM receives a clear code command from the scan tool. |
Diagnostic Aids
| • | Ensure that the set/coast switch is not stuck or sticking in the engaged position. |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, cruise control On/Off switch ON, observe the scan tool Cruise Resume/Accel. Switch while toggling the resume/accel switch from R/A to On. The reading should change between On and Off.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the multifunction switch.
- Ignition ON, verify the scan tool Cruise Set/Coast Switch parameter reads Off.
- If all circuits test normal, test or replace the multifunction switch.
| ⇒ | If the scan tool parameter reads On, test the cruise control set/coast switch signal circuit for a short to voltage. If the circuit tests normal, replace the PCM/ECM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the multifunction switch.
- Cruise control On/Off switch ON, test for infinite resistance between the signal circuit terminal A and signal circuit terminal C.
| ⇒ | If not the specified value, replace the multifunction switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PCM (4.2L) or ECM (5.3L) replacement, setup, and programming |
