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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

Circuit Description

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

Conditions for Running the DTC

* DTCs P0033, P0034, P0035, P0097, P0098, P0100, P0101, P0102, P0103, P0121, P0122, P0123, P0221, P0222, P0223, P0234, P0237, P0238, P0299, P2228, or P2229, are not set.

* The boost pressure versus the Barometric Pressure (BARO) ratio is between 1.1-3.3.

* The charge air bypass valve has been commanded ON 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 engine speed is grater than 1,800 RPM.

* This DTC runs continuously within the enabling conditions.

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 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 Fuel Pump and Level Sensor Assembly

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 Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0033, P0034, or P0035 is not set.

• If any of the DTCs are set
Refer to DTC P0033-P0035 P0033.

• If none of the DTCs are set

3. Verify the scan tool BARO Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table for the current testing altitude.

• If the parameter is not within the range specified in the table.
Refer to DTC P2227-P2230 P2227.

• If the parameter is within the range specified in the table.

4. Verify the scan tool Boost Pressure Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi).

• If the parameters are not within 3 kPa (0.4 psi).
Refer to DTC P0236 P0236.

• If the parameters are within 3 kPa (0.4 psi).

5. Verify a click is heard or felt from the Q40 turbocharger bypass solenoid valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.

• If a click is not heard or felt
Refer to Circuit/System Testing

• If a click is heard or felt

6. 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.

7. Verify a DTC does not set.

• If a DTC sets
Refer to Circuit/System Testing

• If a DTC does not set

8. All OK

Circuit/System Testing

1. Verify the conditions listed below do not exist:

* Vacuum leaks.

* Vacuum line restrictions

* 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 exists
Repair or replace the affected component as necessary.

• If none of the conditions exist

2. Disconnect the vacuum hose at the turbocharger bypass valve.

3. Install a vacuum gauge to the hose.

4. Engine Idling, verify the vacuum gauge displays between 51-67 kPa (15-20 inches Hq) of vacuum.

• The gauge does not display between 51-67 kPa (15-20 inches Hq) of vacuum.
Inspect and repair the leaking vacuum hose in the areas listed below:

* Between the turbocharger bypass valve and the turbocharger bypass solenoid valve

* Between the intake manifold and the turbocharger bypass solenoid valve

• The gauge displays between 51-67 kPa (15-20 inches Hq) of vacuum.

5. Disconnect the vacuum hose at the turbocharger vacuum reservoir on the bottom of intake manifold.

6. Connect the GE 23738-A to the vacuum reservoir and apply 34 kPa (10 inches Hg) of vacuum.

7. Verify the reservoir holds vacuum for at least 10 s.

• The reservoir does not hold vacuum for at least 10 s
Replace the intake manifold

• The reservoir holds vacuum for at least 10 s

8. Engine idling, vacuum gauge still installed from step 3, command the Turbocharger Bypass Solenoid Valve ON and OFF with the scan tool.

9. Verify the vacuum toggles between 0 kPa (0 inches Hg) when OFF to greater than 51 kPa (15 inches Hg) when ON.

• The vacuum does not toggle between 0-51 kPa (0-15 psi)
Replace the Q40 turbocharger bypass solenoid valve

• The vacuum toggles between 0-51 kPa (0-15 psi)

10. Verify damage to the turbocharger bypass valve assembly does not exist. Refer to Turbocharger Cleaning and Inspection Service and Repair.

• If the bypass valve assembly is damaged
Repair or replace the valve assembly as necessary

• If the bypass valve assembly is not damaged

11. Replace the turbocharger.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Charge Air Bypass Regulator Solenoid Valve Replacement Charge Air Bypass Regulator Solenoid Valve Replacement for turbocharger bypass solenoid valve replacement.

Turbocharger Replacement Service and Repair

Control Module References Control Module References for ECM replacement, programming and setup

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