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Vauxhall Workshop Service and Repair Manuals

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DTC P0236, P0237, or P0238 - LLU > < DTC P0340 - LLU

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DTC P0243, P0245, or P0246 - LLU

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 P0243 00:  Turbocharger Wastegate Solenoid Valve Control Circuit

DTC P0245 00:  Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage

DTC P0246 00:  Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Ignition Voltage Circuit

P0033 00, P0034 00, P0243 00, P0245 00, P0443 00, P0597 00, P0598 00

P0243 00, P0245 00

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-

Control Circuit

P0245 00

P0243 00

P0246 00

P0243 00

Circuit/System Description

The BorgWarner™ dual scroll turbocharger incorporates a wastegate that is controlled by a pressure differential, that is determined by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, in order to regulate the pressure ratio of the compressor. A charge air bypass valve also controlled by the ECM by utilising a remotely mounted solenoid is integrated into the bypass valve to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. When the bypass valve is open during closed throttle deceleration conditions, the bypass valve allows the air to recirculate in the turbocharger and maintain compressor speed. Within a calibrated range during the closed throttle event, or upon a wide open throttle command the bypass valve will then close to optimise turbo response. The turbocharger wastegate actuator has the following circuits:

    •  Ignition voltage
    •  Turbocharger wastegate solenoid control

At idle the turbocharger wastegate solenoid parameter is commanded to 0% by the ECM. When the engine load and RPM first increase under a wide open throttle, the turbocharger wastegate solenoid parameter should briefly be commanded as great as 90-100%. When the proper level of boost pressure is attained, the ECM will decrease the PWM of the solenoid to a range of 65-85%. As soon as the throttle closes the ECM will command the turbocharger wastegate solenoid parameter back to 0%, in order to allow the turbocharger wastegate to open from the air pressure ratio differential, thereby reducing the speed of the turbine.

Conditions for Running the DTC

    •  The engine speed is greater than 40 RPM.
    •  The battery voltage is between 10-18 V.
    •  This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

The ECM detects an open, a short to ground, or a short to voltage on the turbocharger wastegate solenoid control circuit for greater than 0.5 s.

Action Taken When the DTC Sets

    •  DTCs P0243 00, P0245 00 and P0246 00 are Type C DTCs.
    •  The service vehicle soon indicator will illuminate.
    •  The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

Conditions for Clearing the DTC

DTCs P0243 00, P0245 00 and P0246 00 are Type C DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation



Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  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. Verify the proper operation of the turbocharger.
  2. Use the scan tool output controls to command the turbocharger wastegate solenoid parameter from 0-100%. An audible series of clicks when the command is between 20-90% should be heard and felt.
  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. Clear the DTCs with a scan tool.
  2. Inspect for damage to the turbocharger wastegate actuator.
  3. Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve.
  4. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.
    5. ⇒ If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
  5. Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
    6. ⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
  7. Command the turbocharger wastegate solenoid parameter to 50% with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50% and turn OFF when commanded to 0%.
    8. ⇒ If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    ⇒ 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 K20 Engine Control Module.
  8. If the circuits test normal, test or replace the Q42 Turbocharger Wastegate Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

DTC P0236, P0237, or P0238 - LLU > < DTC P0340 - LLU