• | 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. |
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 |
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 has the following circuits:
• | Ignition 1 voltage |
• | Turbocharger wastegate solenoid control |
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.
• | The engine speed is greater than 80 RPM. |
• | The battery voltage is between 10-18 volts. |
• | This DTC runs continuously within the enabling conditions. |
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.
• | DTCs P0243, P0245, P0246 are Type B DTCs. |
• | The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power. |
DTCs P0243, P0245, P0246 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | Perform an inspection of the TC. Refer to Turbocharger Cleaning and Inspection. |
• | Use the scan tool output controls to command the TC Wastegate Solenoid parameter from 0-100 percent. An audible series of clicks when the command is between 20-90 percent should be heard and felt. |
• | 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. |
⇒ | If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance. |
⇒ | 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. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |