Preliminary Inspection

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.