For 1990-2009 cars

## DTC P0567 8.1L

### Circuit Description

The cruise control resume/accel switch is an input to the throttle actuator control (TAC) module. The TAC module uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The TAC module detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. The TAC module sends a serial data signal to the powertrain control module (PCM) via the serial data circuit. This DTC sets if the PCM receives a serial data signal from the TAC module indicating that voltage is present on the cruise control resume/accel switch signal circuit for longer than 90 seconds.

### Conditions for Running the DTC

• | The ignition is ON.

• | The cruise control switch is ON.

### Conditions for Setting the DTC

The PCM receives a serial data signal from the TAC module indicating that the resume/accel switch is applied for longer than 90 seconds.

### Action Taken When the DTC Sets

• | The PCM stores the DTC information into memory when the diagnostic runs and fails.

• | The malfunction indicator lamp (MIL) will not illuminate.

• | The PCM records the operating conditions at the time the diagnostic fails. The PCM 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 resume/accel 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.

1. This step determines if a condition is present.

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference : Cruise Control Schematics Connector End View Reference: Powertrain Control Module Connector End Views in Engine Controls - 8.1L
1 | Did you perform the Diagnostic System Check - Cruise Control? | Go to Step 2 | Go to Diagnostic System Check - Cruise Control
2 |

1. Install a scan tool.
2. Turn the ignition ON, with the engine OFF.
3. Turn the cruise On/Off control switch ON.
4. With the scan tool, observe the Cruise Resume/Accel. Switch parameter in the PCM data list.

Does the Cruise Resume/Accel. Switch parameter display On?

Go to Step 3

Go to Diagnostic Aids

3 |

1. Turn the ignition OFF.
2. Disconnect the cruise control switch.
3. Turn the ignition ON, with the engine OFF.
4. With the scan tool, observe the Cruise Resume/Accel. Switch parameter.

Does the Cruise Resume/Accel. Switch parameter display On?

Go to Step 4

Go to Step 5

4 | Test the cruise control resume/accel 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 cruise control 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 8
6 | Inspect for poor connections at the harness connector of the throttle actuator control (TAC) module. 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
7 | Replace the TAC module. Refer to Electronic Throttle Actuator Control Module Replacement in Engine Controls - 8.1L. Did you complete the replacement? | Go to Step 9 | --
8 | Replace the cruise control switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 9 | --
9 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK