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Home >> Chevrolet >> 2017 >> Volt Premier >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 1.5L (L3A) - DTC P0446 To DTC P2636 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P12A6: Fuel Pump Driver Control Module Enable Circuit Performance >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle 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. Vehicle in Service Mode for greater than 10 s.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.
    • If the test lamp illuminates 
    1. Vehicle OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module, vehicle in Service Mode.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  4. Remove the test lamp.
  5. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is OK when commanding the Fuel Pump Enable On with a scan tool.
    • If OK is not displayed 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If OK is displayed 
  6. Install a 3 A fused jumper wire between the control circuit terminal 2 and ground.
  7. Verify the scan tool Fuel Pump Enable Circuit Low Voltage Test Status parameter is Malfunction when commanding the Fuel Pump Enable On with a scan tool.
    • If Malfunction is not displayed 
    1. Vehicle OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If Malfunction is displayed 
  8. Replace the K111 Fuel Pump Driver Control Module.
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