Chevrolet Trax: DTC P0243, P0245, OR P0246

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0243

Turbocharger Wastegate Solenoid Valve Control Circuit

DTC P0245

Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage

DTC P0246

Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

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 pulse width modulation (PWM) solenoid, in order to regulate the pressure ratio of the compressor. A charge air bypass valve also controlled by the ECM by utilizing 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 bypass 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 bypass valve will then close to optimize turbo response. The turbocharger wastegate actuator has the following circuits:

• Ignition voltage
• Turbocharger wastegate solenoid control

At idle the turbocharger wastegate solenoid parameter is commanded to 0% by the ECM. When the engine load and RPM first increases under a wide open throttle, the turbocharger wastegate solenoid parameter should briefly be commanded as great as 90-100%. When the proper level of boost pressure is attained, the ECM will decrease the PWM of the solenoid to a range of 65-85%. As soon as the throttle closes the ECM will command the turbocharger wastegate solenoid parameter back to 0%, in order to allow the turbocharger waste gate to open from the air pressure ratio differential, there by reducing the speed of the turbine.

Conditions for Running the DTC

• Ignition ON or engine running.
• The battery voltage is between 11-32 V.
• This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTCs P0243, P0245 and P0246 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0243, P0245 and P0246 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON
2. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15- 100 % with a scan tool.

• If a series of clicks in increasing frequency are not heard or felt

Refer to Circuit/System Testing.

• If a series of clicks in increasing frequency is heard or felt

3. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool.

• Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status
• Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status
• Turbocharger Wastegate 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. 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 Q42 Turbocharger Wastegate Solenoid Valve.

   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, remove the test lamp.
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, remove the test lamp.

NOTE: An internal short in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated.

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 all components connected to the ignition voltage circuit for a short
• and replace as necessary.
• If the test lamp illuminates

3. Remove the test lamp.
4. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status parameter is OK.

• If OK is not displayed

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 OK is displayed

5. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is OK.

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 Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction.

• If Malfunction is not displayed

1. Ignition OFF, remove the jumper wire, 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 Q42 Turbocharger Wastegate Solenoid Valve.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve.
2. Test for 20-27 ohms between terminal 1 and terminal 2 of the solenoid valve.

• If not between 20-27 ohms

Replace the Q42 Turbocharger Wastegate Solenoid Valve.

• If between 20-27 ohms

3. All OK

Dynamic Test

1. Install a 10 A fused jumper wire between the Ignition terminal 2 and 12 V. Install a jumper wire between the control terminal 1 and ground.
2. Verify the solenoid clicks.

• If the solenoid does not click

Replace the Q42 Turbocharger Wastegate Solenoid Valve.

• If the solenoid clicks

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Turbocharger Wastegate Regulator Solenoid Valve Replacement
• Control Module References for ECM replacement, programming and setup

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