CDI Electronics Outboard Ignition Troubleshooting Guide

213 Appendix Appendix Glossary of Terms ADI – Alternator Driven Ignition , consists of a flywheel, stator, trigger and ignition module. ADTC - After Top Dead Center Reference on ignition timing. BTDC - Before Top Dead Center Reference on ignition timing. CD Ignition – Capacitive Discharge Ignition . The capacitor stores the power developed by a stator or inverter and uses a SCR to deliver the power to the ignition coil. CDM – Capacitive Discharge Module . The CDM is a combination of the switch box and ignition coil. Crank - Refers to the engine being turned over with the starter, not running. Spark plug wires are usually connected to a spark gap tester. DVA – Direct Voltage Adapter . Also known as Peak voltage. The term refers to the peak voltage as read by a specialized meter or a multimeter using an adapter to convert the peak voltage in the ignition system to a DC value. Regular meters cannot read the voltages due to the frequency and duration of the pulses in the system. Power Pack – Term used by Johnson/Evinrude for the ignition module. RPM – Revolutions per minute . The number of times the engine rotates in one minute. S.L.O.W. – Speed Limiting Oil Warning system. Limits the RPM of the engine to approximately 2500 RPM in order to reduce the damage to the engine caused by a no oil or overheat condition. Spark Tester - Device used to check for spark from the ignition coil to the spark plug. Testers are normally available in 1, 4, 6 and 8 cylinder configurations. Switch Box – Term used for Force, Mariner and Mercury ignition modules. W.O.T. – Wide Open Throttle .