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 P2107: Throttle Actuator Control (TAC) Module Internal Circuit

### Circuit/System Description

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the throttle actuator control motor. The ECM monitors the actual throttle valve position using throttle position (TP) sensor 1 and 2. The ECM amplifies the TP sensor 1 signal in order to obtain a more accurate signal. The ECM monitors the TP sensor 1 amplification output whenever the ignition is ON and a closed throttle test is performed.

### Conditions for Running the DTC

• | The ECM is performing the closed throttle test with the ignition ON and the engine OFF.

• | DTC P2107 runs once the above conditions are met during the throttle actuator control system initialization.

### Conditions for Setting the DTC

The ECM detects the internal TP sensor 1 amplification output does not correlate with the TP sensor 1 signal voltage for greater than 4 seconds.

### Action Taken When the DTC Sets

DTC P2107 is a Type A DTC.

### Conditions for Clearing the DTC

DTC P2107 is a Type A DTC.

### Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool for 30 seconds. DTC P2107 should not set.

⇒ | If P2107 is set, replace the ECM.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for engine control module replacement, setup, and programming