P0034
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 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 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 valve is commanded closed by the ECM. As soon as the throttle closes, the valve is commanded open to 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 Sunshade - Left
Description and Operation
Turbocharger System Description
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
2. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
• If a click is not heard or felt
Refer to Circuit/System Testing
• If a click is heard or felt
3. Verify the circuit status parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool:
* 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
• If Malfunction is displayed
Refer to Circuit/System Testing
• If Malfunction is not displayed
4. 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.
5. Verify a DTC does not set.
• If a DTC sets
Refer to Circuit/System Testing
• If a DTC does not set
6. All OK
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve. Ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 1 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 Solenoid Valve
• If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and the ignition circuit terminal 1.
• 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 2 and the ignition circuit terminal 1.
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 Solenoid Valve.
Component Testing
Static Test
1. Ignition OFF, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve.
2. Test for 10-14 ohms between the control terminal 2 and the Ignition terminal 1 of the Q40 Turbocharger Bypass Solenoid Valve.
• If not between 10-14 ohms
Replace the Q40 Turbocharger Bypass Solenoid Valve.
• If between 10-14 ohms
3. All OK
Dynamic Test
1. Install a 10 A fused jumper wire between the ignition terminal 2 of the Q40 Turbocharger Bypass Solenoid Valve and 12 V. Install a jumper wire between the control terminal 1 and ground.
2. Verify the Q40 Turbocharger Bypass Solenoid Valve plunger retracts.
• If the plunger does not retract.
Replace the Q40 Turbocharger Bypass Solenoid Valve.
• If the plunger retracts.
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Turbocharger Bypass Valve Solenoid Replacement (LTG)
* Control Module References Control Module References for ECM replacement, programming, and setup