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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0010 - P0333)) >> Diagnostic Information And Procedures >> DTC P0033, P0034, Or P0035: Turbocharger Bypass Solenoid Valve 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 Q40 Turbocharger Bypass Solenoid Valve, Ignition On.
  2. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition Off.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition Off, remove the test lamp.
      2. NOTE:

      An short circuit in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated.

    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test all components supplied by the fuse and replace as necessary.
    • Go to next step: If the test lamp illuminates 
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and the ignition circuit terminal 1.
    • If the test lamp illuminates 
    1. Ignition Off, disconnect the 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 
  4. Remove the test lamp.
  5. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool.
    • If OK is not displayed 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On.
    2. 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 OK is displayed 
  6. Install a 3 A fused jumper wire between the control circuit terminal 2 and the ignition circuit terminal 1.
  7. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool.
    • If Malfunction is not displayed 
    1. Ignition Off, disconnect the 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, replace the K20 Engine Control Module.
    • Go to next step: If Malfunction is displayed 
  8. Test or replace the Q40 Turbocharger Bypass Solenoid Valve.
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