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 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 turbocharger. A turbocharger bypass valve also controlled by the ECM by utilizing a remotely mounted solenoid is integrated into the bypass valve to prevent turbocharger 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 turbocharger speed. Within a calibrated range during the closed throttle event, or upon a wide open throttle command the valve will then close to optimize turbo response. The bypass valve solenoid has the following circuits:
* Ignition voltage
* Turbocharger bypass solenoid valve control
As engine load and engine speed 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 turbocharger surging.
Conditions for Running the DTC
* The engine is not cranking.
* The powertrain relay voltage is greater than 11 V.
* The run/crank voltage is greater than 6 V.
* The DTC run continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects an open, a short to ground, or a short to voltage on the turbocharger bypass valve solenoid control circuit for greater than 1 s.
Action Taken When the DTC Sets
DTC P0033, P0034, P0035 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0033, P0034, P0035 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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, Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between 0-100% with a scan tool:
* Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing.
• If Malfunction is not displayed
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 you observed from the Freeze Frame/Failure Records data.
3. Verify a DTC does not set.
• If a DTC sets
Refer to Circuit/System Testing
• If a DTC does not set
4. All OK
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the Q40 turbocharger bypass valve solenoid. Ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 2 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, test or replace the Q40 turbocharger bypass valve solenoid
• If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the control circuit terminal 1 and the ignition circuit terminal 2.
• If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K20 Engine Control Module.
• If the test lamp does not illuminate
4. Remove the test lamp.
5. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool.
• If OK is not displayed
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If OK is displayed
6. Install a 3 A fused jumper wire between the control circuit terminal 1 and the ignition circuit terminal 2.
7. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool.
• If Malfunction is not displayed
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If Malfunction is displayed
8. Test or replace the Q40 turbocharger bypass valve solenoid.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Charge Air Bypass Regulator Solenoid Valve Replacement Charge Air Bypass Regulator Solenoid Valve Replacement
* Control Module References Control Module References for ECM replacement, programming and setup