LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P042E Or P042F: Exhaust Gas Recirculation (EGR) Open/Closed 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

    • Go to next step: If no condition is present 
  2. Ignition Off, disconnect the harness connector at the Q14 Exhaust Gas Recirculation Valve, ignition On.
  3. Verify a test lamp does illuminate between the EGR motor control circuit terminal 6 and ground.
    • If the test lamp does not illuminate 
    1. Ignition Off, remove the test lamp and disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Test for infinite resistance between the 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
    • Go to next step: If the test lamp illuminates 
  4. Ignition ON, verify a test lamp does not illuminate between the EGR motor control circuit terminal 5 and B+.
    • If the test lamp illuminates 
    1. Ignition Off, remove the test lamp and disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the 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
    • Go to next step: If the test lamp does not illuminate 
  5. Ignition On, verify a test lamp illuminates between the EGR motor control circuit terminal 2 and B+ when commanding the EGR Motor to 10% with a scan tool.
    • If the test lamp does not illuminate 
    1. Ignition Off, remove the test lamp and disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω
    3. Ignition ON, 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.
    • Go to next step: If the test lamp illuminates 
  6. Replace the Q14 Exhaust Gas Recirculation Valve.
scientia non olet · About LEMON Manuals