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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P1029 or P102A-P102C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: K111 Fuel Pump Driver Control Module
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for less than 1 V between the test points:
    • Control circuit terminal 8 & Ground
    • Control circuit terminal 9 & Ground
    • Control circuit terminal 24 & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  5. Ignition/Vehicle & All vehicle systems - Off
  6. Test for infinite resistance between the test points:
    • Control circuit terminal 8 & Ground
    • Control circuit terminal 9 & Ground
    • Control circuit terminal 24 & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  7. Disconnect the electrical connector: A7 Fuel Pump and Level Sensor Assembly
  8. Test for less than 2 ohms between the test points:
    • Control circuit terminal 8 @ K111 Fuel Pump Driver Control Module & Control circuit terminal 1 @ A7 Fuel Pump and Level Sensor Assembly
    • Control circuit terminal 9 @ K111 Fuel Pump Driver Control Module & Control circuit terminal 2 @ A7 Fuel Pump and Level Sensor Assembly
    • Control circuit terminal 24 @ K111 Fuel Pump Driver Control Module & Control circuit terminal 3 @ A7 Fuel Pump and Level Sensor Assembly
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit:

    • Go to next step: If less than 2 ohms 
  9. Verify DTC P102C is not set.
    • If the DTC sets 
    1. Disconnect the electrical connector: A7 Fuel Pump and Level Sensor Assembly
    2. Test for infinite resistance between the test points:
      • Control circuit terminal 8 & Control circuit terminal 9
      • Control circuit terminal 8 & Control circuit terminal 24
      • Control circuit terminal 9 & Control circuit terminal 24
      • If less than infinite resistance - Repair the short between the circuits.
      • Go to next step: If infinite resistance
    3. Replace the component: A7 Fuel Pump and Level Sensor Assembly
    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 - Replace the component: K111 Fuel Pump Driver Control Module
      • Go to next step: If the DTC does not set
    5. All OK.
    • Go to next step: If the DTC is not set 
  10. Replace the component: A7 Fuel Pump and Level Sensor Assembly
  11. 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 

      Replace the component: K111 Fuel Pump Driver Control Module

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