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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P2199: Intake Air Temperature (IAT) Sensors 1-2 Not Plausible >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To minimize the effects of residual engine heat and sensor internal heating elements, perform Steps 1 and 2 of this verification procedure only if the ignition has been OFF for 8 hours or more.
  1. Ignition ON.
  2. Verify the following scan tool parameters are within 25°C (45°F) of each other.
    • Start-Up IAT Sensor 1
    • Start-Up IAT Sensor 2
    • Start-Up ECT
    • If not within 25°C (45°F) 

      Refer to Circuit/System Testing below.

    • Go to next step: If within 25°C (45°F) 
  3. Engine idling, verify the following scan tool parameters are between -38 to +149°C (-36 to +300°F).
    • IAT Sensor 1
    • IAT Sensor 2
    • ECT Sensor
    • If not between -38 to +149°C (-36 to +300°F) 

      Refer to Circuit System Testing below.

    • Go to next step: If between -38 to +149°C (-36 to +300°F) 
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTC does not set.
    • If any DTC sets 

      Refer to Circuit/System Testing below.

    • Go to next step: If no DTC sets 
  6. All OK
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