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Circuit/System Testing

  1. Ignition OFF, disconnect the IC module connector. Test for less than 5 ohms of resistance between the IC module low reference circuit and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. Test for less than 3 ohms of resistance between the IC module ground circuit 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 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 at the IC Module 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 for an open/high resistance, short to ground, or short to voltage. If the circuit tests OK, test the IC timing signal circuit 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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