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DTC P003A (LBY)

DTC P003A (LBY)

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 1 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 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 engine speed is between 750-850 RPM.

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

• DTCs P003A or P003B 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 desired boost pressure actuator and the actual boost pressure actuator exceed a calibrated threshold during a valid learn event.

• The above condition is met.


Action Taken When the DTC Sets

DTCs P003A and P003B are Type C DTCs.

Conditions for Clearing the DTC

DTCs P003A and P003B are Type C DTCs.

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:


• Boost Pressure Actuator LPT replacement

• Boost Pressure Actuator HPT 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 run the engine.

• The 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.

4. If the DTC resets, replace the K20 Engine Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Engine Control Module replacement, setup, and programming