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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0016 To DTC P0406) >> Diagnostic Information and Procedures >> DTC P0403, P0489, P0490, P1407, P140D, P140E or P140F: Exhaust Gas Recirculation (EGR) Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the Q14 Exhaust Gas Recirculation Valve. Ignition ON.
  2. Verify a test lamp illuminates between the high control circuit terminal 6 and B+.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Disconnect the harness connector at the K20 Engine Control Module.
    3. Test for less than 2 Ω in the high control 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 less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module
    • If the test lamp illuminates 
  3. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
  4. Verify a test lamp does not illuminate between the high control circuit terminal 6 and B+.
    • If the test lamp illuminates 

      Repair the short to ground on the circuit.

    • If the test lamp does not illuminate 
  5. Verify a test lamp illuminates between the low control circuit terminal 2 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Disconnect the harness connector at the K20 Engine Control Module.
    3. Test for less than 2 Ω in the low control 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 low control 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 the test lamp illuminates 
  6. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
  7. Verify a test lamp does not illuminate between the close control circuit terminal 2 and ground.
    • If the test lamp illuminates 

      Repair the short to voltage on the circuit.

    • If the test lamp does not illuminate 
  8. Test or replace the Q14 Exhaust Gas Recirculation Valve.
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