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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Engine Control System & Fuel System - 3.8L - DTC P0016 To DTC P0350) >> DTC P0101 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  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. You should measure less than 5 ohms.
    • 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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