Cruze

DTC P0033-P0035

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 PWM solenoid, in order to regulate the pressure ratio of the compressor. A compressor 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 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 valve will then close to optimise turbo response. The bypass valve solenoid has the following circuits:

As engine load and RPM increases the turbocharger bypass solenoid parameter should remain commanded ON by the ECM. As soon as the throttle closes the turbocharger bypass solenoid parameter should be commanded OFF by the ECM, in order to allow the turbocharger bypass valve to open and allow the turbocharger air to recirculate, there by preventing compressor surging.

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

DTC  P0033 00, P0034 00, P0035 00, are Type C DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Use the scan tool output controls to command the Turbocharger Bypass Solenoid Valve command parameter to 100% and back to 0%. An audible click should be heard and felt.
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 are captured in the freeze frame/failure records data.

1. Clear the DTCs with a scan tool.
2. Ignition OFF, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.

⇒	If the test lamp does not illuminate test the ignition circuit for a short to ground or an open/high resistance.

4. Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.

⇒	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.

5. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 2.
6. Command the Q40 Turbocharger Bypass Solenoid Valve to 100% and back to 0% with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	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 an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

7. If the circuits test normal, test or replace the Q40 Turbocharger Bypass Solenoid Valve.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for replacement, setup, and programming.