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Home >> Saturn >> 2007 >> Relay 3.9 W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0010 To DTC P0420 >> DTC P0101 or P1101 >> Circuit/System Testing
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Circuit/System Testing

  1. Inspect for any contamination, water intrusion, or debris on the sensing elements of the MAF sensor.
    • If debris is present, clean the sensor. If the sensor cannot be cleaned, replace the sensor.
  2. Ignition OFF, disconnect the harness connector at the MAF sensor.
  3. Test for less than 5 ohms of resistance between the ground circuit terminal C 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 1 circuit terminal B and ground.
    • If the test lamp does not illuminate, test the Ignition 1 circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse for the ignition 1 voltage circuit is open, test or replace the MAF sensor.
  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 control module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the control module.
    6. IMPORTANT: To set up the J 38522  , place the duty cycle to normal, the frequency to 5 K, and the signal switch to 5 volts. See Special Tools .
  6. Turn OFF the ignition and connect the red lead of the J 38522  to the signal circuit at the MAF sensor harness connector and the black lead to a good ground. See Special Tools .
  7. Start the engine and observe the MAF sensor for 4,950-5,025 Hz with a scan tool.
    • If the MAF sensor is not within the specified range, test for an intermittent or poor connection at the control module. If the circuit tests normal, replace the control module.
    • If the MAF sensor is within the specified range, test for an intermittent or poor connection at the MAF sensor. If tests normal, replace the MAF sensor.
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