P0567

DTC P0567

CIRCUIT DESCRIPTION
The cruise control keeps the vehicle running at a driver's set speed. When the cruise main switch is turned ON, battery voltage is provided to the engine control module (ECM). When a signal from the control switch is inputted to the ECM, the cruise control system is activated. The "cruise main" indicator light in the meter assembly will light up when the cruise main switch is ON. When the cruise resume switch is turned "ON", the switch signal is provided to the ECM and the vehicle speed is reset to the previous set speed. If the ECM detects the cruise resume switch signal continuously "ON", this DTC will set.

Condition for Running the DTC
- The battery voltage is between 10-16 volts.
- The ignition switch is ON.

Condition for Setting the DTC
- The ECM detects that the cruise resume/accel. switch signal is stuck at the ON position (high voltage) for longer than 1 minute.

Action Taken When the DTC Sets
12,000 lbs GVW
- The ECM illuminates the service vehicle soon (SVS) lamp when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
- The ECM inhibits the cruise control.
- The ECM inhibits the PTO control.

Except 12,000 lbs GVW
- The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive driving cycle when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records on the second consecutive driving cycle when the diagnostic runs and fails.
- The ECM inhibits the cruise control.
- The ECM inhibits the PTO control.

Condition for Clearing the MIL/DTC
12,000 lbs GVW
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic after the ECM turns OFF the SVS lamp.
- Clear the SVS lamp and the DTC with a scan tool.

Except 12,000 lbs GVW
- The ECM turns OFF the MIL when the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
If an intermittent condition is suspected, the following may cause an intermittent:
- Faulty cruise resume/accel switch
- Misrouted harness
- Rubbed through wire insulation

Check for the following conditions:
- Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "Cruise Resume/Accel. Switch" display on the scan tool with the ignition ON and engine OFF while moving connectors and the wiring harness related to the switch. A change in the display will indicate the location of the fault.

NOTE: This DTC will set if the cruise resume/accel. switch continues being pushed for longer than 1 minute.

DTC P0567
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

Step 2 - 8:

Step 9 - 11: