Riviera V6-3.8L SC VIN 1 (1995)
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PCM applies 5 volts to the electronic ignition module "bypass" circuit, signaling the module to allow the PCM to control the dwell and spark
timing.
This is IC mode ignition. During IC mode, the PCM compensates for all driving conditions. Again, the electronic ignition module is responsible
for proper ignition coil sequencing during both the module AND IC modes.