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Home >> Chevrolet >> 2015 >> Camaro LS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 6.2L (L99 LS3 LSA) Or 7.0L (LS7) - DTC P0010 To DTC P0333) >> Diagnostic Information and Procedures >> DTC P0112 or P0113: Intake Air Temperature (IAT) Sensor >> Circuit/System Testing

Circuit/System Testing

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

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

  1. Ignition OFF and all systems OFF, it may take up to for 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the B75B Mass Air Flow /Intake Air Temperature sensor.
  2. Test for less than 2 Ω between the low reference circuit terminal D and ground.
    • If 2 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 or high resistance in the circuit.
      • If less than 2 Ω replace the engine control module.
    • If less than 2 Ω 
  3. Ignition ON, test for 4.8-5.2 V between the intake air temperature signal 1 circuit terminal E and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the engine control module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. 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.
    • If greater than 5.2 V 
      NOTE:

      If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.

    1. Ignition OFF, disconnect the harness connector at the engine control module.
    2. Ignition ON, test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the engine control module.
    • If between 4.8-5.2 V 
  4. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F).
    • If not colder than -39°C (-38°F). 

      Replace the engine control module.

    • If colder than -39°C (-38°F). 
  5. Ignition OFF. Install a 3 A fused jumper wire between the signal circuit terminal E and low reference circuit terminal D.
  6. Ignition ON. Verify the scan tool IAT Sensor 1 parameter is warmer than 149°C (300°F).
    • If not warmer than 149°C (300°F). 

      Replace the K20 Engine Control Module.

    • If warmer than 149°C (300°F). 
  7. Test or replace the B75B Mass Air Flow /Intake Air Temperature sensor.
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