P0033
DTC P0033-P0035
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0033
- Turbocharger Bypass Solenoid Valve Control Circuit
DTC P0034
- Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage
DTC P0035
- Turbocharger Bypass Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The BorgWarner(TM) dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve, which uses a remotely mounted solenoid, is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed.
As engine load and RPM increase, the turbocharger bypass solenoid valve is commanded ON by the ECM. As soon as the throttle closes, the solenoid is commanded OFF to allow the bypass valve to open and allow the turbocharger air to recirculate to prevent compressor surging.
Conditions for Running the DTCs
* Ignition is ON or the engine is running.
* Battery voltage is between 11-32 V.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTCs
The ECM detects an open, a short to ground, or a short to voltage on the turbocharger bypass solenoid valve control circuit for greater than 10 s.
Action Taken When the DTCs Set
DTCs P0033, P0034, and P0035 are Type B DTCs.
Conditions for Clearing the MIL/DTCs
DTCs P0033, P0034, and P0035 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Turbocharger System Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information.
Circuit/System Verification
1. Ignition ON, command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. A click should be heard and felt.
2. Command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool while observing the following control circuit status parameters:
* Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status
Each parameter should toggle between OK and Not Run
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, disconnect the harness connector at the Q40 turbocharger bypass valve solenoid.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 or A and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. Verify that a test lamp does not illuminate between the control circuit terminal 2 or B 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.
4. Connect a test lamp between the control circuit terminal 2 or B and the ignition circuit terminal 1 or A.
5. Command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. The test lamp should turn OFF and ON.
• 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.
6. If the circuits test normal, test or replace the Q40 turbocharger bypass valve solenoid.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Turbocharger Control Solenoid Valve Replacement Turbocharger Control Solenoid Valve Replacement for turbocharger bypass valve solenoid replacement.
* Control Module References Control Module References for ECM replacement, programming, and setup