Diagnostic Instructions

DTC Descriptors

DTC P0243: Turbocharger Wastegate Solenoid Control Circuit

DTC P0245: Turbocharger Wastegate Solenoid Control Circuit Low Voltage

DTC P0246: Turbocharger Wastegate Solenoid Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Ignition 1 Voltage Circuit	P0010, P0013, P0033, P0034, P0245, P2088, P2090	P0243	P0243, P0245	--	--
Turbocharger Wastegate Solenoid Control Circuit	P0245	P0243	P0243	P0246	P0243

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 charge air 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 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 TC wastegate actuator solenoid valve has the following circuits:

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

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 wastegate solenoid control circuit for greater than 4 seconds continuously, or 50 seconds cumulative.

Action Taken When the DTCs Set

DTC P0243, P0245, P0246 are Type B DTCs.

Conditions for Clearing the MIL/DTCs

DTC P0243, P0245, P0246 are Type B DTCs.

Diagnostic Aids

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the TC wastegate actuator solenoid valve.
2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.

Important: If the ignition fuse is open, it will be necessary to test the spliced voltage supply circuits and the components for a short to ground.

⇒	If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.

3. Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
4. Command the TC Wastegate Solenoid parameter to 50 percent with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50 percent and turn OFF when commanded to 0 percent.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

⇒	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 ECM.

5. If the circuits test normal, replace the TC wastegate actuator solenoid valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.