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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the MAF sensor.
  2. Ignition OFF, allow sufficient time for the ECM to power down. Test for less than 5 ohms of resistance between the low reference circuit terminal D and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the MAF sensor signal circuit terminal A and ground.
    • If less than the specified range, test the MAF sensor signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the MAF sensor signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Ignition ON, verify that a test lamp illuminates between the MAF sensor 12-volt reference voltage circuit terminal C and ground.
    • If the test lamp does not illuminate, test the 12-volt reference circuit for a short to ground or an open/high resistance.
  5. Connect the J 38522  to the vehicle. Refer to Component Testing.
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