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Home >> Saturn >> 2010 >> Sky Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.4L - DTC P0010 To DTC P0366 >> DTC P0102 or P0103 >> Circuit/System Testing
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Circuit/System Testing

  1. Verify the integrity of the air induction system by inspecting for the following conditions:
    • Loose or improper installation
    • Water intrusion
  2. Ignition OFF for 90 seconds, disconnect the harness connector at the MAF/IAT sensor.
  3. Test for less than 5 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal A and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Ignition OFF, connect the red lead of the J 38522  to the signal circuit terminal A at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
  7. Set the J 38522  Signal switch to 5 volts, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
  8. Engine Idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,025 Hz.
    • If the MAF Sensor parameter is not within the specified range, replace the ECM.
  9. If the circuits test normal, test or replace the MAF sensor.
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