P0568

Diagnostic Chart:

Wiring Diagram:

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 a ignition voltage signal to the PCM when the Set/Coast switch is ON.

Conditions for Setting the DTC

^ The PCM performs this DTC diagnostic continuously.

^ The Cruise Control ON/OFF switch in the OFF position.

^ Ignition voltage on Set/Coast request signal circuit.

^ All of the diagnostic set conditions met for 2 seconds.

or

^ The PCM performs this DTC diagnostic continuously.

^ The Cruise Control ON/OFF switch in the ON position.

^ Set/Coast request switch ON for longer than 25.5 seconds.

^ All of the diagnostic set conditions met for 2 seconds.

Action Taken When the DTC Sets

^ The PCM disallows all cruise control inputs.

^ Torque Converter Clutch (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 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 (160°F) that same ignition cycle.

^ 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

Number(s) below refer to the Step 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.