For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category

### DTC Descriptor

DTC P060D: Internal Control Module Accelerator Pedal Position Performance

### Circuit/System Description

The throttle actuator control (TAC) system uses 2 accelerator pedal position (APP) sensors to monitor the pedal position. Two processors are also used to monitor the TAC system data. The engine control module (ECM) performs an intrusive test in order to detect that the APP signals are not shorted together. The ECM accomplishes this by pulling the APP sensor 2 low momentarily and looking for sensor 1 to also be low. The TAC system also performs this test on the throttle position (TP) sensors. This diagnostic monitors the transistor used to pull one pedal and one throttle sensor to ground simultaneously. Additionally both processors monitor each other's data to verify that the indicated APP calculation is correct.

### Conditions for Running the DTC

• | The system voltage is more than 5.23 volts.

• | The ignition is in the Unlock/Accessory or Run position.

• | DTCs P0601, P0602, P0604, P0606, P0607 or P1621 are not set.

### Conditions for Setting the DTC

The APP sensor 2 voltage is more than 2.05 volts for more than 0.3 second during the intrusive test.

OR

The APP sensor calculations in the main processor differ from the motor control processor by more than 5 percent.

### Action Taken when the DTC Sets

DTC P060D is a type A DTC.

### Conditions for Clearing the MIL/DTC

DTC P060D is a type A DTC.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References

### Circuit/System Testing

1. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
2. Ignition ON, use a scan tool to observe the DTCs.

⇒ | If DTC P0602 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

3. Ignition OFF, disconnect the accelerator pedal connector. Make sure that the pedal is at the rest position. Measure for more than 450 ohms from the 5 volt reference terminal of the accelerator pedal assembly to the APP sensor 2 signal terminal of the accelerator pedal assembly.

⇒ | If less than 450 ohms, replace the accelerator pedal assembly.

4. If the pedal test is normal, replace the ECM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Accelerator Pedal Position Sensor Replacement .

• | Engine Control Module Replacement for engine control module replacement, setup and programming.