2010 Cadillac Truck SRX AWD V6-3.0L Page 1042

2010 Cadillac Truck SRX AWD V6-3.0L Page 1042

- 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.

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)