Important: The DTC descriptor that the scan tool displays will not match this DTC due to DTCs P0567 and P0568 being reversed within the engine control module (ECM). This will only affect this vehicle for the 2004 model year.
Circuit Description
The cruise control set/coast switch is an input to the 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.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The cruise control On/Off switch is ON. |
Conditions for Setting the DTC
| • | This DTC sets if the ECM detects a voltage signal on the cruise control set/coast switch signal circuit for greater than 60 seconds. |
| • | This ECM runs this diagnostic every 0.05 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 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
| • | 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 in Wiring Systems. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views or to Engine Control Module Connector End Views in Engine Controls - 3.6L (LY7) | |||
1 | Did you perform the Cruise Control Diagnostic System Check? | Go to Step 2 | |
Does the Cruise Set/Coast Switch parameter display On? | Go to Step 3 | Go to Diagnostic Aids | |
3 |
Does the Cruise Set/Coast Switch parameter display On? | Go to Step 4 | Go to Step 5 |
4 | Test the cruise control set/coast switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 9 | -- |
8 |
Important: Program the replacement ECM. Replace the ECM. Refer to Engine Control Module Replacement in Engine Controls - 3.6L (LY7). Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
