2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 999
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.
P0034
The ECM detects the bypass solenoid valve control circuit is shorted to ground.
P0035
The ECM detects the bypass solenoid valve control circuit is shorted to voltage.
Action Taken When the DTC Sets
DTC P0033, P0034, and P0035 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0033, P0034, and P0035 are Type B DTCs.
Diagnostic Aids
If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the circuit status for the
component with a scan tool. The circuit status parameter changes from OK or Not Run to Malfunction if there is a condition with the circuit or a
connection.
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)
