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Home >> Chevrolet >> 2020 >> Traverse LS, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0071-P0074 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B9 Ambient Air Temperature Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal B (or 2) and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the appropriate harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference 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 less than 10 Ω 
  3. Ignition ON.
  4. Verify the ECM scan tool Ambient Air Temperature parameter reads colder than -30°F (-34°C).
    • If -30°F (-34°C) or warmer 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal A (or 1) 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 colder than -30°F (-34°C) 
  5. Install a 3 A fused jumper wire between the signal circuit terminal A (or 1) and the low reference circuit terminal B (or 2).
  6. Verify the scan tool Ambient Air Temperature parameter reads warmer than 180°F (82°C)
    • If 180°F (82°C) or colder 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Ignition OFF
    4. Test for less than 2 Ω in the 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.
    • Go to next step: If warmer than 180°F (82°C) 
  7. Apply dielectric grease to connector terminals.
  8. Connect the component: B9 Ambient Air Temperature Sensor
  9. Operate the vehicle within the Conditions for Running the DTC.
  10. Verify the DTC does not set.
    • If the repair did not correct the DTC/symptom 

      Test or replace the component: B9 Ambient Air Temperature Sensor

    • Go to next step: If the repair corrected the DTC/symptom 
  11. All OK.
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