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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P040B - P204D)) >> Diagnostic Information And Procedures >> DTC P1176 Or P1177: Fuel Pump Driver Control Module 5V Reference 1-2 Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

Additional DTCs will set when disconnecting the components.

  1. Ignition OFF, disconnect the harness connector at all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids .
  2. Ignition ON.
  3. Test for 4.8 - 5.2 V between one of the 5V reference circuits and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connectors at the K111 Fuel Pump Driver Control Module.
    2. Test for infinite resistance between the 5V reference circuit for each applicable component and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K111 Fuel Pump Driver Control Module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connectors at the K111 Fuel Pump Driver Control Module.
    2. Test for less than 1 V between the 5V reference circuit for each applicable component and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K111 Fuel Pump Driver Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
    4. NOTE:

    A short to voltage or ground on the signal circuit of certain components may cause this DTC to set.

  4. Verify the appropriate scan tool 5V Reference 1, 2 Circuit Status parameter displays OK while connecting each component associated with the 5V reference circuit one at a time.
    • If the parameter does not display OK when a component is connected 

      Test the signal circuit of that component for a short to ground or voltage. If the circuit tests normal, replace the component.

    • Go to next step: If the parameter displays OK when all components are connected 
  5. All OK.
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