LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0102 or P0103 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Inspect the fuse in the ignition 1 voltage circuit of the MAF sensor.
    • If the fuse is open, test the ignition 1 spliced circuits and the components for a short to ground.
    2. IMPORTANT: The test lamp is used to load the circuit. Use the J 35616-200  for this test. If the J 35616-200  is not available, use a test lamp that measures more than 20 ohms.
  2. With the ignition ON and the engine OFF, disconnect the harness connector at the MAF sensor. With a DMM, measure the battery voltage and record the measurement.
  3. Connect a test lamp between the MAF sensor ignition 1 voltage circuit and a good ground. With the test lamp still connected, measure for battery voltage between the ignition 1 voltage circuit at the probe end of the test lamp and a good ground.
    • If the voltage is not within 1.5 volts of battery voltage, repair the high resistance or the open in the circuit.
  4. Measure for a voltage range of 4.8-5.2 volts between the MAF sensor signal circuit and a good ground.
    • If the voltage is less than 4.8 volts, test the circuit for a short to ground, an open, or for a faulty ECM.
    • If the voltage is more than 5.2 volts, test the circuit for a short to voltage, or for a faulty ECM.
  5. Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
  6. Measure for a resistance value of less than 5 ohms between the ground circuit of the MAF sensor and a good ground.
    • If the resistance is more than 5 ohms, repair the high resistance or the open in the ground circuit.
  7. Connect the J 38522  to the vehicle. See Special Tools . Refer to Component Testing.
  8. Start the engine and observe the MAF Sensor parameter for a proper range of 4,950-5,025 Hz.
    • If the MAF Sensor parameter is not within the specified range, replace the ECM.
    • If the MAF Sensor parameter is within the specified range, replace the MAF sensor.
scientia non olet · About LEMON Manuals