Chart 2

Diagnostic Chart:

Wiring Diagram:

This chart will isolate possible faults that could occur with the ignition system. Whenever the engine is cranking as indicated, by the sensor pulses, the PCM will send pulses to the EI module. The PCM pulses (0-5v) to control the charge time (dwell) and spark timing for each ignition event. Each pair (1 and 4 or 2 and 3) of cylinders are controlled separately. An engine may or may not start on two cylinders

TEST DESCRIPTIONS
1. Since each coil is controlled separately it is important to test for spark from each coil. If spark is available on both cylinders two and four it indicates the ignition system is OK. The fuel system should be checked at this point. Also the spark plugs could be fouled.
2. Spark on one wire indicates that power and ground are OK to the module.