Monday, April 18, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 1039

2010 Cadillac Truck SRX FWD V6-3.0L Page 1039



* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 1)



* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 2)



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 1)



* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen



Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 2)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming



P0033



DTC P0033-P0035



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC P0033



- Turbocharger Bypass Solenoid Valve Control Circuit



DTC P0034



- Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage



DTC P0035



- Turbocharger Bypass Solenoid Valve Control Circuit High Voltage



Diagnostic Fault Information



Circuit/System Description



The turbocharger bypass solenoid valve is used to prevent the turbo from exceeding the pump limit at low flow and high pressure. This occurs



when the engine is running with a load and the throttle suddenly closes. In this case, flow is almost null and pressure is very high. This not only is



damaging to the turbocharger, but also generates noise and decelerates turbine speed. Ignition voltage is supplied directly to the bypass solenoid



valve and the engine control module (ECM) controls the valve by grounding the control circuit with a solid state device called a driver. The driver



is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or



shorted to a voltage by monitoring the feedback voltage.



Conditions for Running the DTC



* The engine speed is greater than 80 RPM.



* The ignition voltage is between 10-18 V.



* The ECM has commanded the bypass solenoid valve ON and OFF at least once during the ignition cycle.



* The DTCs run continuously once the above conditions are met.



Conditions for Setting the DTC



P0033



The ECM detects the bypass solenoid valve control circuit is open.

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