P0568

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The cruise set/coast switch is an input to the fuel control portion of the PCM. These inputs allow the PCM to control and hold a requested speed. The 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 PCM performs this DTC diagnostic continuously.
^ The ignition switch in the ON position.

CONDITIONS FOR SETTING THE DTC
Ignition voltage on set/coast request signal circuit when the cruise control ON/OFF switch in the OFF position.
or
^ Set/Coast request switch ON for longer than 25.5 seconds when the Cruise Control ON/OFF switch in the ON position.
^ All of the diagnostic set conditions met for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM disallows all cruise control inputs.
^ TCC shift schedules may be affected.
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ The use of a scan tool.

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 switch is at fault.