GM/Detroit 6.5L ENGINE CONTROLS – DTC P0567 Cruise Control Resume Switch Circuit

Circuit Description
The cruise resume/accel 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 resume/accel switch sends ignition voltage to the PCM when the switch is closed (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 resume request signal circuit when the cruise control ON/OFF switch in the OFF position.
or
• Resume switch ON for longer than 25.5 seconds 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 is stored 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
Check for a resume/accel switch stuck in the engage position or the signal circuit is shorted 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..

 

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