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Home >> Buick >> 2007 >> Allure CXL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0016 To P0341 >> DTC P0101 >> Circuit/System Testing
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Circuit/System Testing

  1. Turn ON the ignition, with the engine OFF.
  2. Measure the battery voltage.
  3. Disconnect the MAF sensor.
  4. Connect a test lamp between the MAF sensor ignition 1 voltage circuit and a good ground.
  5. With the test lamp still connected, measure for battery voltage between the ignition 1 voltage circuit and a good ground.
    • If the voltage is not within 0.75 volts of battery voltage, repair the high resistance in the circuit.
  6. Measure the voltage between the MAF sensor signal circuit and a good ground for 4.9-5.2 volts.
    • If the voltage is less than 4.9 volts, test the circuit for high resistance or an open.
    • If the voltage is within 4.9-5.2 volts, test the circuit for a short to the IAT signal circuit or to any other 5-volt reference circuit.
  7. Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
  8. Measure the resistance between the ground circuit of the MAF sensor and a good ground for less than 5 ohms of resistance. You should measure less than 5 ohms of resistance.
    • If the resistance is more than 5 ohms, repair the high resistance in the ground circuit.
    9. IMPORTANT: To set up the J 38522  , place the duty cycle to normal, the frequency to 5K, and the signal switch to 5 volts. See Special Tools .
  9. 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 .
  10. Start the engine and observe the MAF sensor for a range of 4,950-5,025 Hertz.
    • If the MAF sensor is not within specified range, test for intermittent or poor connectors at the control module. If the circuit tests normal, replace the control module.
    • If the MAF sensor is within specified range, test for intermittent or poor connectors. If the circuit tests normal, replace the MAF sensor.
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