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Home >> Chevrolet >> 2023 >> Camaro ZL1, 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Controls And Fuel - 3.6L - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0128 or P01F0 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    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: X164 Inline Harness Connector
    3. NOTE:

    Testing for steps 3 to 7 is performed on the control module K20 side of the harness connector.

  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 2@X164 Inline Harness Connector & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: X2@K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 2@X164 Inline Harness Connector & The other end of the circuit@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. Verify the scan tool parameter: ECT Sensor = Colder than -39°C (-38°F)
    • If warmer than -39°C (-38°F) 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X3@K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 1@X164 Inline Harness Connector & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If colder than -39°C (-38°F) 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2@X164 Inline Harness Connector
  7. Verify the scan tool parameter: ECT Sensor = Warmer than 149°C (300°F)
    • If 149°C (300°F) or colder 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X3@K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 1@X164 Inline Harness Connector & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 1@X164 Inline Harness Connector & Terminal 38 X3@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 warmer than 149°C (300°F) 
  8. Disconnect the electrical connector: B34 Engine Coolant Temperature Sensor
  9. Connect the electrical connector: X164 Inline Harness Connector
  10. Ignition - On/Vehicle - In Service Mode
  11. Verify the scan tool parameter: ECT Sensor = Colder than -39°C (-38°F)
    • If warmer than -39°C (-38°F) 

      Replace the component: X164Component harness

    • Go to next step: If colder than -39°C (-38°F) 
  12. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Low Reference circuit terminal 1@B34 Engine Coolant Temperature Sensor
  13. Verify the scan tool parameter: ECT Sensor = Warmer than 149°C (300°F)
    • If colder than 149°C (300°F) 

      Replace the component: X164Component harness

    • Go to next step: If warmer than 149°C (300°F) 
  14. Test or replace the component: B34 Engine Coolant Temperature Sensor
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