P0568

DTC P0568

CIRCUIT DESCRIPTION
The cruise control set/coast switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast switch signal circuit in order to detect when the driver has requested to set the vehicle speed or to allow the vehicle to coast. The ECM detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied. This DTC sets if the ECM detects that voltage is present on the cruise control set/coast switch signal circuit for longer than 90 seconds.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0568 Cruise Control Set Switch Circuit

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The Cruise switch is ON.

CONDITIONS FOR SETTING THE DTC
The ECM detects the set/coast switch is ON for longer than 90 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The ECM stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
- The cruise is disabled.

CONDITIONS FOR CLEARING THE MIL/DTC
- A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL/DTC.

DIAGNOSTIC AIDS
- Inspect for a set/coast switch stuck in the engaged position or the signal circuit is shorted to voltage.
- For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections.

TEST DESCRIPTION

Step 1 - Step 9:

The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if condition is present.