P2261
DTC P2261
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 Descriptor
DTC P2261
- Turbocharger Bypass Valve Stuck
System Description
The BorgWarner(TM) dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve, which uses a remotely mounted solenoid, is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed. The valve closes during open throttle commands, to optimize turbo response.
Front wheel drive platforms also incorporate a bypass valve vacuum tank. The purpose of the tank is to provide an instant source of vacuum to the bypass valve, when it is commanded open by the ECM. This results in less pressure buildup under closed throttle conditions, thereby reducing compressor noise and surge.
The purpose of this diagnostic is to determine if the bypass valve is stuck closed. The ECM will first verify the integrity of the following sensors. The ECM then compares the actual measured mass air flow (MAF) to a modeled airflow that is derived from these inputs:
* Throttle position
* Engine speed
* Boost pressure sensor
* Manifold absolute pressure (MAP) sensor
Conditions for Running the DTC
* DTC P0033, P0034, P0035, P0101, P0102, P0103, P0236, P0237, or P0238 is not set.
* The boost pressure versus the BARO pressure ratio is between 1.1-3.3.
* The turbocharger bypass valve has been commanded Open greater than 6% for greater than 1 s immediately after an abrupt closed throttle has occurred and the resulting pressure ratio across the compressor exceeds the calibrated pressure ratio limit.
* The DTC runs continuously when the above conditions have been met.
Conditions for Setting the DTC
The ECM has detected a series of pulsations in the induction system that exceed a calibrated threshold.
Action Taken When the DTC Sets
DTC P2261 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P2261 is a Type B DTC.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Turbocharger System Description Description and Operation
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 Programming and Relearning for scan tool information.
Circuit/System Verification
1. Verify that DTC P0033, P0034, or P0035 is not set
• If a DTC is set, refer to DTC P0033-P0035 P0033 for further diagnosis.
2. Engine running, command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. A click should be heard and felt.
3. Set up the scan tool for a snapshot of the induction data list. With the emergency brake on, the vehicle transmission in neutral, and the engine idling, perform a wide open throttle and then quickly release the accelerator. Review the Boost Pressure Sensor parameter. There should not be any abnormal pulsations of the parameter.
4. With the parking brake ON and the engine idling in neutral, perform an audible test of the valve by depressing the throttle wide open, then quickly releasing it to a closed throttle position. A valve that is stuck shut will generate a rapid pulsating or fluttering sound. There should not be any unusual noise.
5. 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. Verify the conditions listed below do not exist:
* Vacuum leaks
* Vacuum line restrictions
* Bypass solenoid valve damage or sticking
* Bypass valve assembly damage. Refer to Turbocharger Cleaning and Inspection (LDK, LHU)
* Improper routing or connecting of the vacuum hoses on the turbocharger bypass valve solenoid, the bypass valve, and the bypass valve vacuum tank
• If a condition is found, repair or replace the affected component as necessary.
2. If all inspections are normal, test or replace the charge air bypass valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Charge Air Bypass Valve Replacement Charge Air Bypass Valve Replacement
* Turbocharger Control Solenoid Valve Replacement Turbocharger Control Solenoid Valve Replacement for turbocharger bypass valve solenoid replacement.