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 Descriptors

DTC P02E0: Intake Air (IA) Flow Valve Control Circuit
DTC P02E0 01: Intake Air (IA) Flow Valve Control Circuit Short to Battery
DTC P02E0 02: Intake Air (IA) Flow Valve Control Circuit Short to Ground
DTC P02E0 04: Intake Air (IA) Flow Valve Control Circuit Open Circuit
DTC P02E0 54: Intake Air (IA) Flow Valve Control Circuit Open Circuit High Temperature
DTC P02E2: Intake Air (IA) Flow Valve Control Circuit Low Voltage
DTC P02E3: Intake Air (IA) Flow Valve Control Circuit High Voltage

### Circuit/System Description

A throttle plate actuator is used to achieve high exhaust gas recirculation rates. It increases the pressure difference between exhaust and intake so that the appropriate exhaust quantity can be mixed with the intake air. The ECM transmits the desired angle as a PWM signal to the throttle plate actuator. The throttle plate actuator operates the DC motor to control the throttle plate based on the PWM signal from the ECM. The throttle plate position is monitored by an internal position sensor.

### Conditions for Running the DTC

• | The ignition is ON, or the engine is running.

• | The throttle actuator motor is commanded ON or OFF.

• | The ignition voltage is less than 16 volts.

• | The DTCs run continuously when the above conditions are met.

### Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the throttle actuator control circuit for greater than 1 second.

### Action Taken When the DTC Sets

DTCs P02E0, P02E2, and P02E3 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P02E0, P02E2, and P02E3 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Ignition ON, command the throttle blade from 0-95 percent with a scan tool. The throttle blade should respond to the scan tool commands.
2. Observe the scan tool DTC information parameter. DTCs P02E0, P02E2, or P02E3 should not set.
3. 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.

### Circuit/System Testing

1. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the throttle body assembly.
2. Test for less than 5 ohms of resistance between the ground circuit terminal 1 and ground.

⇒ | If greater than the specified range, repair the ground circuit for an open/high resistance.

3. Install the MAIN fuse. Ignition ON, measure for battery voltage between the battery voltage circuit terminal 2 and ground.

⇒ | If less than the specified range, repair the battery voltage circuit for an open/high resistance.

4. Connect a test lamp between the throttle blade control circuit terminal 3 and B+.
5. Command the throttle blade from 0-95 percent with a scan tool. The test lamp should respond to the scan tool commands.

⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits test normal, replace the throttle body assembly.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Throttle Body Assembly Replacement

• | Control Module References for ECM replacement, setup, and programming