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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Engine Controls And Fuel - 1.5L (LFV) - DTC P034A-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P1007 or P129D >> Circuit/System Testing

Circuit/System Testing

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    NOTE:

    Circuit/System Verification must be performed first or misdiagnosis may result.

  1. Ignition OFF, all vehicle systems OFF, disconnect the harness connector at the K111 Fuel Pump Driver Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Ignition ON.
  3. Verify a test lamp illuminates between the ignition circuit terminal 17 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit 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.
    • Go to next step: If the test lamp illuminates 
  4. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min for all vehicle systems to power down.
  5. Verify a test lamp does not illuminate between the ignition circuit terminal 17 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the circuit.

    • Go to next step: If the test lamp does not illuminate 
  6. Replace the K111 Fuel Pump Driver Control Module.
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