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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> DTC P2199: Intake Air Temperature (IAT) Sensor 1-2 Not Plausible >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.

Multifunction Intake Air Sensor

  1. Ignition Off, disconnect the harness connector at the B75C Multifunction Intake Air Sensor.
  2. Connect a DMM between the IAT sensor 1 signal terminal 1 and the low reference terminal 3.
    3. NOTE:

    A thermometer can be used to test the sensor off the vehicle.

  3. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance - Intake Air Temperature Sensor table. The resistance values should be in range of the table values.
    • If not within the specified range 

      Replace the B75C Multifunction Intake Air Sensor.

    • Go to next step: If within the specified range 
  4. All OK.

Multifunction Intake Air Sensor

  1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%.
    • If not within the specified range 

      Replace the B75C Multifunction Intake Air Sensor.

    • Go to next step: If within the specified range 
  2. All OK.

Circuit Testing with EL-38522-A

    NOTE:

    In-correct diagnosis will result if Circuit/System Testing is not completed before performing the following test.

  1. Perform the following test using a EL-38522-A  Variable Signal Generator or equivalent, if available.
  2. Ignition Off, connect the leads of the EL-38522-A  Variable Signal Generator as follows:
    1. Red lead to the IAT 2 signal circuit terminal 8 at the harness connector
    2. Black leads to ground
    3. Battery voltage supply lead to B+
  3. Set the EL-38522-A  Variable Signal Generator to the following specifications.
    • Signal switch to 5 V
    • Duty Cycle switch to 50% (Normal)
    • Frequency switch to 250 Hz
  4. Ignition On.
  5. Verify the scan tool IAT Sensor 2 parameters listed below are within the ranges listed below:
    • IAT Sensor 2 is between 248 - 252 Hz
      • NOTE:

      Changing the frequency should cause a warmer or colder IAT 2 temperature.

    • IAT Sensor 2 is between 70 - 76°C (160 - 166°F)
      • NOTE:

      Increasing or decreasing the duty cycle should have an inverse affect on humidity.

    • Intake Air Humidity Sensor is between 48 - 52%
    • If a parameter is not within the specified range 
    1. Ignition Off, disconnect the harness connector X3 at the K20 Engine Control Module.
    2. 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 all the parameters are within the specified range 
  6. All OK.
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