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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 2.4L - DTC P0010 To DTC P0114 (LUK)) >> Diagnostic Information and Procedures >> DTC P0097, P0098, or P0099: Intake Air Temperature (IAT) Sensor 2 (LEA) >> 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, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  2. Ignition OFF, all vehicle systems OFF, test for less than 2Ω between the ground circuit terminal 7 and ground.
    • If 2Ω or greater 
    1. Ignition OFF, disconnect the sensor chassis ground.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open or high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 2Ω 
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
    2. Test for less than 2Ω in the ignition voltage circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test all components connected to the ignition circuit, replace as necessary.
    • If a test lamp illuminates 
  4. Determine if EL-38522-A   Variable Signal Generator or equivalent is available.
    • EL-38522-A, Variable Signal Generator; or equivalent is not available 
    1. Test or replace the B75C Multifunction Intake Air sensor
    2. 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.
    3. Verify the DTC does not set.
      • If the DTC sets 

        Replace the K20 Engine Control Module.

      • If no DTCs set 
    4. All OK.
    • EL-38522-A, Variable Signal Generator; or equivalent is available 
  5. Ignition OFF, connect the leads of the EL-38522-A   Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal 8 at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  6. Set the EL-38522-A   Variable Signal Generator to the following specifications.
    • Signal switch to 5V
    • Duty Cycle switch to 50% (Normal)
    • Frequency switch to 30Hz
  7. Ignition ON, verify the scan tool IAT Sensor 2 parameter is between 28-32 Hz.
    • If not between 28-32 Hz 

      Replace the K20 Engine Control Module.

    • If between 28-32 Hz 
  8. Circuits and ECM test OK. Test or replace the appropriate temperature sensor.
  9. All OK.
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