EI Module and Coil Pack

The EI module and coil pack is located on the transaxle housing attached to the spark plug wires. The Electronic Ignition (EI) module charges and discharges the coils based on PCM control. The PCM uses a high control signal of near 5 volts to charge up the coil and a low control signal of near 0 volts to discharge the coil. If the coil is charged and the control signal is low, the coil will fire through its secondary towers. The PCM controls spark timing and dwell (spark On-time) under all engine running conditions.

The EI module also has the ability to determine when #4 cylinder has fired on compression by the use of compression sense ignition circuitry. This eliminates the need for a camshaft position sensor. Refer to "MISFIRE DIAGNOSTICS" system description for further details.