P0246
DTC P0243, P0245, or P0246
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 P0243
-
Turbocharger Wastegate Solenoid Valve Control Circuit
DTC P0245
-
Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage
DTC P0246
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Turbocharger Wastegate 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 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 [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
* Boost Control System Description (LUJ) Boost Solenoid, Turbocharger
* Turbocharger System Description (LUJ) Turbocharger System Description (LUJ)
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. Perform an inspection of the turbocharger. Turbocharger Cleaning and Inspection 54. Turbocharger Cleaning and Inspection.
2. Use the scan tool output controls to command the turbocharger wastegate solenoid parameter from 0-100%. An audible series of clicks when the command is between 20-90% should be heard and felt.
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. Clear the DTCs with a scan tool.
2. Inspect for damage to the turbocharger wastegate actuator.
3. Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve.
4. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 1 and ground.
• If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
5. Verify that a test lamp does not illuminate between the control circuit terminal 2 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.
6. Connect a test lamp between the control circuit terminal 2 and the voltage supply circuit terminal 1.
7. Command the turbocharger wastegate solenoid parameter to 50% with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50% and turn OFF when commanded to 0%.
• 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 a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
8. If the circuits test normal, test or replace the Q42 Turbocharger Wastegate Solenoid Valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Turbocharger Removal 9. Turbocharger Removal
* Control Module References Control Module References for ECM replacement, programming and setup