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HOMESERVICE MANUALSJEEP2008GRAND CHEROKEE OVERLAND, 5.7 2, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (DIESEL - DTCS B10B3 TO P0092, DIAGNOSTIC PRE-TEST)P0045-BOOST PRESSURE CONTROL CIRCUIT OPENDIAGNOSTIC TEST
2008 Jeep Grand Cherokee Overland, 5.7 2, 4WD

Diagnostic Test

2008 Jeep Grand Cherokee Overland, 5.7 2, 4WDSECTION Diagnostic Test
WARNING: This page is about a different variant/trim than selected.
  1. DTC IS ACTIVE 

    Ignition on, engine not running.

    With the scan tool, Clear DTCs in the Engine Control Module (ECM).

    With the scan tool, actuate the Boost Pressure Servo Motor.

    Monitor the scan tool for at least two minutes.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go To  2.

    No 

    1. Refer to the *CHECKING FOR AN INTERMITTENT CONDITION Diagnostic Procedure.
  2. (A15) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 1: Checking Fused ASD Relay Output 2 Circuit Open Or High Resistance
    GC0039944Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Boost Pressure Servo Motor harness connector.

    Turn the ignition on.

    Using a 12 volt test light connected to ground, check the (A15) Fused ASD Relay Output circuit in the Boost Pressure Servo Motor harness connector.

    NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

    Is the test light illuminated and bright? 

    Yes 

    1. Go to  3.

    No 

    1. Repair the (A15) Fused ASD Relay Output circuit for an open circuit or high resistance.
    2. Perform ECM VERIFICATION TEST .
  3. (X635) BOOST PRESSURE SERVO MOTOR CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Boost Pressure Servo Motor Control Circuit Short To Ground
    GC0039945Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Engine Control Module (ECM) harness connector.

    Measure the resistance between ground and the (X635) Boost Pressure Servo Motor Control circuit in the Boost Pressure Servo Motor harness connector.

    Is the resistance above 1000 ohms? 

    Yes 

    1. Go to  4.

    No 

    1. Repair the (X635) Boost Pressure Servo Motor Control circuit for a short to ground.
    2. Perform ECM VERIFICATION TEST .
  4. (X635) BOOST PRESSURE SERVO MOTOR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking Boost Pressure Servo Motor Control Circuit Open Or High resistance
    GC0039946Courtesy of CHRYSLER LLC

    Measure the resistance of the (X635) Boost Pressure Servo Motor Control circuit between the Boost Pressure Servo Motor harness connector and the Engine Control Module (ECM) harness connector.

    Is the resistance below 10.0 ohms? 

    Yes 

    1. Go to  5.

    No 

    1. Repair the (X635) Boost Pressure Servo Motor Control circuit for an open circuit or high resistance.
    2. Perform ECM VERIFICATION TEST .
  5. BOOST PRESSURE SERVO MOTOR 

    Connect the Engine Control Module (ECM) harness connector.

    Turn the ignition on.

    With the scan tool, actuate the Boost Pressure Servo Motor (Boost Pressure Actuator) to 100%.

    Using a 12 volt test light connected to 12 volts, check the (X635) Boost Pressure Servo Motor Control circuit in the Boost Pressure Servo Motor harness connector.

    NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.