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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 P0137, P0138, P013A, P013B, P013E, P013F, P2270 Or P2271: HO2S >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate B52 Heated Oxygen Sensor harness connector. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
  2. Test for 1.7 - 3.0 V between the high signal circuit terminal 4 and ground.
    • If less than 1.7 V 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the high signal circuit terminal 4 and ground.
      • If less than infinite resistance repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the high signal 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.
    • If greater than 3.0 V 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the high signal circuit terminal 4 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 between 1.7 - 3.0 V 
  3. Verify the scan tool HO2S 1 or 2 parameter is between 1.7 - 2.1 V.
    • If less than 1.7 V 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the low signal circuit terminal 3 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 between 1.7 - 2.1 V 
  4. Connect a 3 A fused jumper wire between the high signal circuit terminal 4 and the low signal circuit terminal 3.
    5. NOTE:

    The low signal circuit is tied to a pull-up circuit within the engine control module. A voltage of 0.0 - 1.10 V on the low signal circuit is normal.

  5. Verify the scan tool HO2S 1 or 2 parameter displays 0.0 V.
    • If greater than 0.0 V 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 2 Ω in the low signal 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 less than 1 V between the low signal circuit terminal 3 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 0.0 V 
  6. Verify none of the conditions listed below exist:
    • If any of the conditions exist 

      Repair as necessary.

    • Go to next step: If none of the conditions exist 

      Test or replace the B52 Heated Oxygen Sensor.

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