P0568

DTC P0568

CIRCUIT DESCRIPTION
The cruise control Set/Coast switch is an input to the throttle actuator control (TAC) module. The TAC module 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 TAC module detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied. The TAC module sends a serial data signal to the PCM via the serial data circuit. This DTC sets if the PCM receives a serial data signal from the TAC module indicating that voltage is present 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 switch is ON.

CONDITIONS FOR SETTING THE DTC
The PCM receives a serial data signal from the TAC module indicating that the Set/Coast switch is ON for longer than 90 seconds.

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

CONDITIONS FOR CLEARING THE MIL/DTC
- A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL/DTC.

DIAGNOSTIC AIDS
Ensure that the Set/Coast switch is not stuck or sticking in the engaged position.

TEST DESCRIPTION

Step 1:

Steps 2-6:

Steps 7-9:

The number below refers to the step number on the diagnostic table.
2. This step determines if condition is present.