2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1867
resulting pressure ratio across the turbo exceeds the calibrated pressure ratio limit.
* The engine is running.
* The ignition voltage is between 10-18 V.
* The ECM has commanded the bypass valve.
* The intake air temperature is greater than 15掳C (59掳F).
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects that the bypass valve is stuck in the closed position. The ECM by comparing the measured MAF to the modeled MAF 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 (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Turbocharger System Description (See: Powertrain Management/Fuel Delivery and Air Induction/Turbocharger/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC Information with a scan tool. DTCs P0033, P0034, or P0035 should not set.
瀚慖f any of the DTCs are set, refer to DTC P0033-P0035 (See: P Code Charts/P0033) for further diagnosis.
2. Ignition ON, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool. An audible click should be
heard.
3. Engine running, command the Turbocharger Bypass Solenoid Valve between Inactive and Active with a scan tool while observing the
following control circuit status parameters:
* Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit Circuit Open Test Status
* Turbocharger Bypass Solenoid Valve Control Circuit Circuit Low Voltage Test Status
The parameters should alternate between OK and Not Run with each change in command.
4. Engine idling, rapidly depress the accelerator pedal from the rest position to the wide open throttle (WOT) position and release pedal. A
valve that is stuck shut will generate an unusual pulsating noise. Compare to similar vehicle. There should not be any unusual noise.
瀚慖f there is unusual noise, refer to Turbocharger Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and
