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 P003A 00: Turbocharger Boost Control Position Not Learned

### Circuit/System Description

The engine control module (ECM) performs the turbocharger learn procedure automatically when the enabling criteria have been met. After each ignition cycle, and before the enable criteria have been met, the ECM will use the previously learned value. If the ECM does not have a previously learned value, it will default to a stored calibrated value.

The ECM commands the turbocharger vane control solenoid to position the turbocharger vanes, and a turbocharger vane position sensor monitors the actual position of the vanes. The ECM varies the boost dependant upon the load requirements of the engine.

### Conditions for Running the DTC

• | The battery voltage is equal to or greater than 11 V.

• | The ECM is commanding the turbocharger vanes open or closed during a position learn process.

• | The engine speed is between 750-850 RPM.

• | The engine coolant temp (ECT) is between 73-96°C (163-205°F).

• | DTC P003A runs once per key cycle when the above conditions are met.

### Conditions for Setting the DTC

• | The engine control module (ECM) determines that the difference between the turbocharger desired vane position sensor and the actual turbocharger vane position exceed a calibrated threshold during a valid learn event.

• | The above condition is met.

### Action Taken When the DTC Sets

DTC P003A is a Type C DTC.

### Conditions for Clearing the DTC

DTC P003A is a Type C DTC.

### Diagnostic Aids

If any service has been performed on the turbocharger or on the turbocharger components, a turbocharger relearn must be performed. Failure to perform the turbocharger learn procedure may cause other DTCs to set.

The turbocharger learn procedure is required when the following service procedures have been performed:

• | Turbocharger vane position control solenoid valve replacement

• | Turbocharger vane position sensor replacement

• | ECM replacement

• | Turbocharger replacement

• | Any service that disturbs the turbocharger components

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Turbocharger System Description

#### 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

Note: Once the enable conditions have been met the throttle must remain at idle. Do not change the accelerator pedal position (APP) during this procedure.

1. The following conditions must be met for the ECM to perform the turbocharger learn procedure:

• | The A/C is OFF.

• | The vehicle is in Park or Neutral.

• | Start and idle the engine.

• | The engine coolant temperature (ECT) is greater than 40°C (104°F).

2. Perform the Turbocharger Learn procedure. Refer to Control Module References
3. Verify the DTC does not reset.

⇒ | If the DTC resets, replace the K20 Engine Control Module (ECM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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