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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. Ignition OFF, disconnect the IC module connector. Test for less than 3 ohms between the IC module ground circuit IC module terminal K and battery ground
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. Ignition ON, test for B+ between the IC module ignition voltage circuit IC module terminal P and ground.
    • If less than the specified range, test the IC module ignition voltage circuit for an open/high resistance or short to ground.
  3. Ignition OFF, connect the IC module.
  4. Disconnect the CMP sensor connector.
  5. Test for less than 1 ohm on the low reference circuit CMP sensor terminal B.
    • If greater than the specified value, test the low reference circuit for an open/high resistance.
  6. Ignition ON, test for more than 10 volts between the 12-volt reference circuit CMP sensor terminal C and ground.
    • If less than the specified range, test the 12-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the IC module.
  7. Ignition ON, test for 4-8 volts between the signal circuit CMP sensor terminal A and ground.
    • If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the IC module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IC module.
  8. Ignition ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit repeatedly. The CMP Sensor RPM parameter should increment.
    • If the CMP Sensor RPM parameter increments, replace the CMP sensor.
  9. Ignition OFF, disconnect the IC module connector. Ignition ON, using a jumper wire connected to ground B+, momentarily touch the camshaft position signal circuit repeatedly. The CMP Sensor RPM parameter should increment.
    • If the CMP Sensor RPM parameter increments, replace the IC module.
    • If the CMP Sensor RPM parameter does not increment, test the camshaft position signal circuit for an open/high resistance, short to ground, or a short to voltage. If all circuits test OK, replace the PCM.
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