DTC P0351: Ignition Control Cylinder No. 1 & 4 Circuit: Description

PCM control dwell and spark timing during all engine running conditions. The Electronic Ignition (EI) module charges the coil pack when the PCM supplies 5 volts to the 1/4 coil. The coil will then discharge or fire through its secondary coil towers whenever the voltage has been turned off by the PCM.