2004 Skidoo ZX Series Service Manual, Page 371Get this manual
Section 07 ENGINES MANAGEMENT (4-TEC) Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
An ignition coil with good resistance measurement can still be faultyVoltage leak can occur at high voltage level which is not detectable with an ohmmeterReplacing the ignition coil may be necessary as test
WARNING
Never make spark test with spark plug removedFlammable vapors may be present in the engine compartment and ignited which could cause an explosionR1004motr150C
ECM CONNECTOR
Voltage Test WARNING
When disconnecting coil from spark plug, always disconnect coil from main harness firstNever check for engine ignition spark from an open coil andor spark plug in the engine compartment as spark may cause fuel vapor to igniteDisconnect the plug connector from the ignition coil and check the voltage supplied by the battery