P0568

DTC P0568

CAUTION: Refer to SIR Caution.

Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling Zone 3.

CIRCUIT DESCRIPTION
The cruise control set/coast switch is an input to the engine control module (ECM). The ECM uses the cruise control set/coast switch signal circuit in order to detect when the driver has requested to set the vehicle speed or to decelerate the vehicle speed. The ECM detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied.

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 control on/off switch is ON.

CONDITIONS FOR SETTING THE DTC
The ECM detects that 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 Control System is disabled.

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

DIAGNOSTIC AIDS
Perform the following in order to avoid misdiagnosis:
- Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the associated cruise control switch parameter in the ECM Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.
- Ensure that the set/coast switch is not stuck or sticking in the engaged position.
- For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

TEST DESCRIPTION

Step 1 - Step 9:

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