P0568

DTC P0568 Cruise Set Circuit






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. Cruise Set/Coast switch sends an ignition voltage signal to the PCM when the Set/Coast switch is "ON". This is a type D DTC.

Conditions for Setting the DTC

^ Cruise switch "OFF".
^ Ignition voltage on Set switch signal circuit.
or
^ Cruise switch "ON".
^ Set switch "ON" for longer than 25.5 seconds

Action Taken When the DTC Sets

^ The PCM will disallow all cruise inputs.
^ TCC shift schedules may be affected.

Conditions for Clearing the MIL/DTC

^ A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (16O°F) that same ignition cycle).
^ Use of a Scan Tool.

Diagnostic Aids

If the Set/Coast switch stuck in the "ON" position or the driver is holding the Set/Coast switch "ON" for longer than 25.5 seconds, DTC P0569 will set. DTC P0568 only checks the signal circuit for a short to voltage.

Test Description

Number(s) below refer to the number(s) 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.