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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 5 ohms between the IC module low reference circuit IC module terminal L and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. 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.
  3. Ignition ON, test for B+ between the IC module ignition voltage circuit and ground.
    • If less than the specified range, test the IC module ignition voltage circuit IC module terminal P for an open/high resistance or short to ground.
  4. Ignition ON, using a jumper wire connected to B+, momentarily touch the low resolution engine speed signal circuit IC module terminal D at the IC module harness connector repeatedly, while measuring the frequency with a DMM. The frequency should be greater than 0 Hz.
    • If the frequency is 0 Hz, test the IC timing control circuit IC module terminal A for an open/high resistance, short to ground, or short to voltage. If the circuit tests OK, test the IC timing signal circuit IC module terminal B for a short to ground. If both circuits test OK, replace the IC module.
    • If the frequency is greater than 0 Hz, replace the PCM.
  5. If all circuits test OK, replace the IC module.
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