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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P018B-P018D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P0641, P165C is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify there are no DTCs set related to the following component/system:
    • K111 Fuel Pump Driver Control Module
    • 5 V Reference
    • Go to next step: If a related DTC is not set 
  4. Engine - Running
  5. Verify the scan tool parameter: Fuel Pressure Sensor = 0.2 to 4.8 V
    • If not between 0.2 and 4.8 V 

      Refer to Circuit/System Testing

    • Go to next step: If between 0.2 and 4.8 V 
  6. Verify the scan tool parameter: Fuel Pressure Sensor = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: B47 Fuel Pressure Sensor
    • Wiggle the harness and connector: K111 Fuel Pump Driver Control Module
    • If the value spikes or drops out 

      Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)

    • Go to next step: If the value does not spike or drop out 
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to Circuit/System Testing

    • Go to next step: If the DTC does not set 
  8. All OK.