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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 P0405 or P0406 >> 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.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:Q14 Exhaust Gas Recirculation Valve
  3. Test for less than 10 ohms between the test points:Low Reference circuit terminal 5 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector:K20 Engine Control Module
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal 5 @ Component harness & Terminal X3 29 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. 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 
  6. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Ignition ON/Vehicle in Service Mode.
  7. 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 
  8. Test or replace the Q14 Exhaust Gas Recirculation Valve.
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