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Home >> Chevrolet >> 2016 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0071-P0074: Ambient Air Temperature Sensor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems» Off
    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.
  2. Disconnect the electrical connector: B9 Ambient Air Temperature Sensor
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal B or 2 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector: K20 Engine Control Module
    2. Test for less than 2 Ω between the test points: Low Reference circuit terminal B or 2 @ Component harness & The other end of the circuit
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Replace the component: K20 Engine Control Module
    • If less than 10 Ω 
  4. Ignition» On / Vehicle» In Service Mode
  5. Verify the scan tool parameter: Ambient Air Temperature= Less than -34°C (-30°F)
    • If -34°C (-30°F) or warmer 
    1. Ignition/Vehicle» Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal A or 1 @ Component harness & Ground
      • If less than infinite resistance» Repair the short to ground on the circuit.
      • If infinite resistance» Replace the component: K20 Engine Control Module
    • If -35°C (-31°F) or colder 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal A or 1 & Low Reference circuit terminal B or 2
  7. Verify the scan tool parameter: Ambient Air Temperature=Greater than 143°C (290°F)
    • If 143°C (290°F) or greater 
    1. Ignition/Vehicle» Off & Remove» Jumper wire(s)
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Ignition» On / Vehicle» In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit @ Component harness & Ground
      • If 1 V or greater» Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle» Off
    6. Test for less than 2 Ω between the test points: Signal circuit @ Component harness & The other end of the circuit
      • If 2 Ω or greater» Repair the open/high resistance in the circuit.
      • If less than 2 Ω» Replace the component: K20 Engine Control Module
    • If 144°C (291°F) or warmer 
  8. Test or replace the component: B9 Ambient Air Temperature Sensor
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