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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 51 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446-DTC P31BF And Symptoms) >> Diagnostic Information and Procedures >> DTC P12A6 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the K111 Fuel Pump Driver Control Module harness connector.
  2. Ignition OFF, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  3. Test for 0 V on the enable circuit terminal 2 of the fuel pump driver control module.
    • If greater than 0 V 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for less than 1 V between the enable circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 ECM.
    • Go to next step: If 0 V 
  4. Ignition ON, command the Fuel Pump Enable ON with a scan tool.
  5. Test for B+ on the enable circuit terminal 2 of the fuel pump driver control module.
    • If less than B+ 
    1. Ignition OFF, disconnect the harness connector at the K20 ECM.
    2. Test for infinite resistance between the enable circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the enable 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 ECM.
    • Go to next step: If B+ 
  6. Replace the K111 Fuel Pump Driver Control Module.
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