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Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the Intake Air Temperature Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the 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 Engine Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool IAT Sensor parameter is at -40°C (-40°F).
    • If warmer than -40°C (-40°F) 
    1. Ignition OFF, disconnect the harness connector at the Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the Engine Control Module.
    • Go to next step: If -40°C (-40°F) 
    5. CAUTION:

    If the fuse in the jumper wire opens, the signal circuit may have a short to a voltage or a short to ground and the sensor might be damaged.

  5. Install a 1 A fused jumper wire between the signal circuit terminal 5 and ground.
  6. Verify the scan tool IAT Sensor parameter is at 150°C (302°F).
    • If colder than 150°C (302°F). 
    1. Ignition OFF, disconnect the harness connector at the Engine Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • 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 Engine Control Module.
    • Go to next step: If 150°C (302°F) 
  7. Test or replace the Intake Air Temperature Sensor.
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