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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 P157A or P16D7-P16D9 >> 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. Ignition Off, disconnect the harness connector at the K111 Fuel Pump Driver Control Module.
  2. Ignition On.
  3. Test for greater than 11 V between control circuit terminal 16 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If 11 V or greater

      Replace the K111 Fuel Pump Driver Control Module

    • Go to next step: If less than 11 V
  4. Ignition Off, disconnect the harness connector: X3 at the K20 Engine Control Module.
  5. Test for less than 1 V between control circuit terminal 16 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If 1 V or greater, repair the short to voltage on the circuit
    • Go to next step: If less than 1 V
  6. Test for infinite resistance between control circuit terminal 16 at the K111 Fuel Pump Driver Control Module harness connector and ground.
    • If less than infinite resistance, repair the short to ground on the circuit
    • Go to next step: If infinite resistance
  7. Test for less than 2 Ω between test points: terminal X3-6 at the Engine Control Module harness and terminal 16 at the K111 Fuel Pump Driver Control Module harness.
    • If 2 Ω or greater, repair the open/high resistance in the circuit
    • Go to next step: If less than 2 Ω

      Go to next step: Replace the K20 Engine Control Module.

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