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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010 To P0459) >> Diagnostic Information and Procedures >> DTC P0404 or P042E: Exhaust Gas Recirculation (EGR) Position Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify that the conditions listed below are not present at the Q14 Exhaust Gas Recirculation Valve:
    • Stuck Q14 Exhaust Gas Recirculation Valve
    • Any coking, soot build up, debris or damage that can cause the EGR valve to stick partially open or closed
    • If a condition is present 

      Repair as necessary

    • If no condition is present 
  2. Vehicle OFF, disconnect the harness connector at the Q14 Exhaust Gas Recirculation Valve, Ignition ON/Vehicle in Service Mode.
  3. Test for greater than 1 V between the test points: Signal circuit terminal 3 & Ground
    • If less than 1 V 
    1. Vehicle OFF.
    2. Disconnect the harness connector at the K20 Engine Control Module.
    3. Test for less than 2 Ω in the input signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    4. Test for infinite resistance between the input signal 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 greater than 1 V 
  4. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Ignition ON/Vehicle in Service Mode.
  5. Test for less than 1 V between the input signal circuit and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  6. Vehicle OFF, connect the harness connector at the K20 Engine Control Module, Ignition ON/Vehicle in Service Mode.
  7. Test for greater than 1 V between the test points: Signal circuit terminal 4 & Ground
    • If less than 1 V 
    1. Vehicle OFF.
    2. Disconnect the harness connector at the K20 Engine Control Module.
    3. Test for less than 2 Ω in the output signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    4. Test for infinite resistance between the output signal 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 greater than 1 V 
  8. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Ignition ON/Vehicle in Service Mode.
  9. Test for less than 1 V between the output signal circuit and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  10. Replace the Q14 Exhaust Gas Recirculation Valve.
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