Part 2 of 2

DTC P023:

Ignition Module Circuit:

NOTES ON FAULT TREE:
5. Checking if bypass control is being sent by the PCM to the ignition control module. If bypass control is being sent the voltage will be greater than 4.1 volts.
6. Checking if bypass control being sent by the PCM is being received by the ignition control module. If CKT 424 is good, resistance will be less than 5.
7. Checking if PCM is providing proper signal to the ICM. If PCM terminal "3F3" has between 30 and 100 Hertz, the PCM is not at fault.
8. Checking if PCM can produce the proper ignition control pulses. If max voltage exceeds 3.7 volts, the PCM is OK and the ICM is at fault.
9. Checking CKT 424 for a short to ground.
10. Checking if the ICM is able to recognize a Bypass Signal. If it does, Code P023 will not set again. If Code P023 resets the ICM is faulty, if it does not reset the PCM is faulty.
11. Checking if ICM is causing incorrect voltage or if PCM is supplying incorrect signal.