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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F >> 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. Perform the scan tool control function: Fuel Pump @ K20 Engine Control Module - On and Off

    Verify the component turns On and Off: G12 Fuel Pump

    • If the component does not turn On and Off 

      Refer to: Circuit/System Testing

    • Go to next step: If the component turns On and Off 
  3. Operate the component: Engine - Idling

    Verify a condition does not exist with the component: Engine - Stalled/Stopped/Stumble

    • Perform the action while monitoring the component:
    • Wiggle the harness and connector: Inline Harness Connector @ G12 Fuel Pump
    • Wiggle the harness and connector: K111 Fuel Pump Driver Control Module
    • If a condition exists 

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

    • Go to next step: If no condition exists 
  4. 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 is not set 
  5. All OK.
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