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Test Procedure

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  1. AK1 PRELIMINARY DIAGNOSIS FOR DTC P0046 
    NOTE: Refer to the PCM and component connector pin numbers at the beginning of this pinpoint test.
    • Carry out a visual inspection.
    • Retrieve and record all DTCs.
    • Record the freeze frame data.
    • Clear the DTCs.
    • Carry out the KOEO and KOER self-test.

    Is DTC P0046 present? 

    Yes No
    GO to  AK2. UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. REFER to SYMPTOM CHARTS , if a driveability concern exists.
  2. AK2 DIAGNOSTIC TROUBLE CODE (DTC) P0046 
    • Possible causes:
      • control circuit open
      • control circuit shorted to voltage
      • control circuit shorted to ground
      • VGT actuator
      • PCM
    • Key in OFF position.
    • VGT Actuator connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) VGT Actuator Connector, Harness Side ( - )
      VGTCH - Pin 1 Ground

    Is the voltage greater than 10.5 V? 

    Yes No
    GO to  AK3. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  3. AK3 CHECK THE VGT ACTUATOR 
    • Key in OFF position.
    • Connect a non-powered test lamp between:
      ( + ) VGT Actuator Connector, Harness Side ( - ) VGT Actuator Connector, Harness Side
      VGTCH - Pin 1 VGT - Pin 2
    • Key ON, engine OFF.
    • Access the PCM and control the VGT PID.
    • Command the VGT to less then 10% duty cycle.
    • Command the VGT to 85% duty cycle.

    Does the test lamp go out as the VGT duty cycle is driven low and illuminate as the duty cycle is driven high? 

    Yes No
    GO to  AK7. GO to  AK4.
  4. AK4 CHECK THE VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect the test lamp.
    • PCM connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) VGT Actuator Connector, Harness Side ( - )
      VGT - Pin 2 Ground

    Is the voltage less than 0.2 V? 

    Yes No
    GO to  AK5. REPAIR the short in the control circuit.
    CLEAR the DTCs. REPEAT the self-test.
  5. AK5 CHECK THE VGT CONTROL FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between:
      ( + ) VGT Actuator Connector, Harness Side ( - )
      VGT - Pin 2 Ground

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  AK6. REPAIR the short in the control circuit.
    CLEAR the DTCs. REPEAT the self-test.
  6. AK6 CHECK THE VGT CONTROL CIRCUIT FOR AN OPEN 
    • Measure the resistance between:
      ( + ) VGT Actuator Connector, Harness Side ( - ) PCM Connector, Harness Side
      VGT - Pin 2 VGT - Pin E10

    Is the resistance less than 5 ohms? 

    Yes No
    GO to  AK8. REPAIR the open in the control circuit.
    CLEAR the DTCs. REPEAT the self-test.
  7. AK7 CLEAN THE VGT ACTUATOR VALVE AND RETEST 
    CAUTION: The VGT actuator valve is sensitive to contamination. All work areas must be clean before starting this procedure. Do not allow contamination to enter the valve ports, cam follower, or turbocharger housing. Handle the VGT actuator by the solenoid body only. Do not attempt to wipe oil off the valve. Do not let the valve come in contact with materials that could contaminate the valve mechanism.
    CAUTION: Use only the Carburetor Tune-Up Cleaner PM-2 to spray the actuator valve. Brake cleaner or other solvents may damage the actuator valve.
    • Remove the VGT actuator from the turbocharger assembly.
      NOTE: Do not spray the zinc coated larger diameter housing, or electrical connector.

      Spray the valve with Carburetor Tune-Up Cleaner PM-2 while pressing the cam follower (tip of the actuator).

    • Install the VGT actuator.
    • VGT Actuator connector connected.
    • Key ON, engine running.
    • Access the PCM and control the VGT PID.
    • Increase the commanded engine speed to 1,250 RPM using output state control. The calibration may limit the actual RPM between 1,150 and 1,200 RPM.
    • Increase the VGT duty cycle to greater then 70%.
    • Decrease the VGT duty cycle to 0%.

    Does the turbocharger pitch change when the VGT duty cycle is increased and decreased  .

    Yes No
    The system is operating correctly at this time. The concern may have been caused by a contaminated VGT actuator valve. CHANGE the oil and oil filter assembly. INSTALL a new VGT actuator. CLEAR the DTCs. REPEAT the self-test.
  8. AK8 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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