P0568

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The cruise Set/Coast switch is an input to the fuel control portion of the Powertrain Control Module (PCM). These inputs allow the PCM to control and hold a requested speed. A cruise Set/Coast switch sends an ignition voltage signal to the PCM when the Set/Coast switch is ON.

CONDITIONS FOR RUNNING THE DTC
The ignition is in the ON position.

CONDITIONS FOR SETTING THE DTC
^ The cruise switch is OFF.
^ The ignition voltage on the set switch signal circuit.

or

^ The cruise switch is ON.
^ The set switch is ON for longer than 25.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ The scan tool Clear Info function was used.

DIAGNOSTIC AIDS
If the Set/Coast switch is stuck in the ON position or the driver is holding the Set/Coast switch ON for longer than 25.5 seconds, DTC P0568 will set. DTC P0568 only checks the signal circuit for a short to voltage.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This step determines if the signal circuit is shorted to voltage.
3. This step determines if the PCM or the switch is malfunctioning.