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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P2199 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

IAT Sensor 1

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B75C Multifunction Intake Air Sensor
  3. Test for 49 to 49, 882 ohms between the test points: Signal terminal 1 & Low Reference terminal 3
    • If not between 49 and 49, 882 ohms 

      Replace the component: B75C Multifunction Intake Air Sensor

    • Go to next step: If between 49 and 49, 882 ohms 
  4. Verify the value is within the range listed in the table: Temperature Versus Resistance - Intake Air Temperature Sensor (B75C) , or Temperature Versus Resistance - Intake Air Temperature Sensor (B65)
    • If not in the specified range 

      Replace the component: B75C Multifunction Intake Air Sensor

    • Go to next step: If in the specified range 
  5. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component: B75C Multifunction Intake Air Sensor

    • Go to next step: If infinite resistance 
  6. All OK.

IAT Sensor 2

    NOTE:

    Circuit/System Testing must be performed before proceeding with Component Testing.

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B75C Multifunction Intake Air Sensor
  3. Install the special tool: EL-38522 Variable Signal Generator
    • Black lead @ Ground
    • Battery Cable Clip @ Battery
    • Red lead @ Signal circuit terminal 8
    • Set the voltage to 5 V
    • Set the frequency to 250 Hz
    • Set the duty cycle to 50%
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter:
    • IAT Sensor 2 = 248 to 252 Hz
    • IAT Sensor 2 = 70 to 76°C (160 to 166°F)
    • Intake Air Humidity Sensor = 48 to 52%
    • If not in the specified range or does not change 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    3. Test for less than 2 ohms between the test points: Signal circuit terminal 8 @ B75C Multifunction Intake Air Sensor & The other end of the circuit @ K20 Engine Control Module
      • 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 in the specified range and changes 
  6. Replace the component: B75C Multifunction Intake Air Sensor
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