DTC P0244-P0246 (LLU)
DTC P0244-P0246 (LLU) |
Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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DTC Descriptors |
DTC P0244 00
Turbocharger Wastegate Solenoid Valve Control Performance
DTC P0245 00
Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage
DTC P0246 00
Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Ignition Voltage Circuit
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P0033 00, P0034 00, P0245 00
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P0244 00, P0245 00
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-
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-
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Control Circuit
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P0245 00
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P0244 00
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P0246 00
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P0244 00
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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:
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Ignition voltage
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Turbocharger wastegate solenoid control
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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 |
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The engine speed is greater that 40 RPM.
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The battery voltage is between 10-18 V.
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This DTC runs continuously within the enabling conditions.
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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 |
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DTCs P0234 00, P0245 00 and P0246 00 are Type C DTCs.
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The service vehicle soon indicator will illuminate.
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The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.
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Conditions for Clearing the DTC |
DTCs P0234 00, P0245 00 and P0246 00 are Type C DTCs.
Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
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Boost Control System Description (LLU)
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Turbocharger System Description (LLU)
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Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification |
1. |
Perform an inspection of the turbocharger.
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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.
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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.
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Circuit/System Testing |
1. |
Clear the DTCs with a scan tool.
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2. |
Inspect for damage to the turbocharger wastegate actuator.
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3. |
Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve.
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4. |
Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.
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5. |
If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
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6. |
Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
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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.
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8. |
Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
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9. |
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%.
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10. |
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.
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11. |
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.
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12. |
If the circuits test normal, test or replace the Q42 Turbocharger Wastegate Solenoid Valve.
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Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Turbocharger Wastegate Regulator Solenoid Valve Replacement (LLU/A16LET)
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Control Module References
for ECM replacement, setup, and programming
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