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Home >> Buick >> 2006 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.8L - DTC P0016 To DTC P0206 >> 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 1.5 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 a high resistance.
    • 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. Connect the J 38522  to the signal circuit of the MAF sensor and a good ground.
  10. To set up the variable speed generator, use the switches to set the duty cycle to normal, the frequency to 5 K and the signal switch to 5 volts.
  11. Start the engine and observe the MAF Sensor parameter for a range of 4,950-5,025 Hertz.
    • If the MAF Sensor parameter is not within 4,950-5,025 Hertz, replace the control module.
    • If the MAF Sensor parameter is within 4,950-5,025 Hertz, replace the MAF sensor.
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