2010 Cadillac Truck SRX AWD V6-3.0L Page 1044
5. Test for 2.6-4.6 V between the control circuit terminal 2 and ground.
瀚慖f the voltage is not within the specified range, replace the K20 ECM.
6. If all circuits test normal, test or replace the Q40 turbocharger bypass solenoid valve.
Component Testing
1. Ignition OFF, disconnect the harness connector at the Q40 turbocharger bypass solenoid valve.
2. Test for 12-60 ohm between the control terminal 2 and the ignition terminal 1 of the Q40 turbocharger bypass solenoid valve.
瀚慖f not within the specified range, replace the Q40 turbocharger bypass solenoid valve.
3. Test for infinite resistance between each terminal and the Q40 turbocharger bypass solenoid valve housing.
瀚慖f not the specified value, replace the Q40 turbocharger bypass solenoid valve.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Turbocharger Disassemble ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and
programming
P0035
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
