LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010-DTC P0459) >> Diagnostic Information and Procedures >> DTC P0404 or P042E >> 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. 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

    • Go to next step: 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.
      • Go to next step: 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
    • Go to next step: 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.

    • Go to next step: 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.
      • Go to next step: 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
    • Go to next step: 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.

    • Go to next step: If less than 1 V 
  10. Replace the Q14 Exhaust Gas Recirculation Valve.
scientia non olet · About LEMON Manuals