Preliminary Inspection

CAUTION: The following precautions should be observed while servicing or testing a Nippondenso ignition system.

Ensure all connections are correct, reverse battery polarity may damage ignitor (ignition control unit).
DO NOT disconnect battery while engine is running or transistors may be damaged.
If a tachometer is connected to system, connect tachometer positive lead to coil negative terminal.
Use care when checking systems, as variations may occur between models. Connectors and wire colors also may vary.
Illustrations, may not apply to all models.
DO NOT allow water to enter ignitor.