Diagnostic Instructions

DTC Descriptors

DTC P0033: Turbocharger Bypass Valve Solenoid Control Circuit

DTC P0034: Turbocharger Bypass Valve Solenoid Control Circuit Low Voltage

DTC P0035: Turbocharger Bypass Valve Solenoid Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Ignition Voltage Circuit	P0010, P0013, P0033, P0034, P0245, P2088, P2090	P0033	P0033, P0034	--	--
Turbocharger Bypass Valve Solenoid Control Circuit	P0034	P0033	P0033	P0035	P0033

Circuit/System Description

The BorgWarner™ dual-scroll turbocharger (TC) 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 utilizing a remotely mounted solenoid is integrated into the unit 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 optimize turbo response. The bypass valve solenoid has the following circuits:

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

Conditions for Running the DTCs

Conditions for Setting the DTCs

The ECM detects an open, a short to ground, or a short to voltage on the TC bypass valve solenoid control circuit for greater than 4 seconds continuously, or 50 seconds cumulative.

Action Taken When the DTCs Set

DTCs P0033, P0034, P0035 are Type B DTCs.

Conditions for Clearing the MIL/DTCs

DTCs P0033, P0034, P0035 are Type B DTCs.

Reference Information

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.

Circuit/System Verification

1. Use the scan tool output controls to command the TC Bypass Solenoid Command parameter ON and OFF. 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 you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Clear the DTCs with a scan tool.
2. Ignition OFF, disconnect the harness connector at the Q40 TC bypass valve solenoid.
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 ECM.

5. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 2.
6. Command the TC bypass solenoid ON and OFF 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 ECM.

⇒	If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

7. If the circuits test normal, test or replace the charge air bypass valve solenoid.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.