Section 03 TROUBLESHOOTING
Subsection 04 (ELECTRICAL SYSTEM)
SYMPTOM THE MPEM DOES NOT WORK.
CONDITION NORMAL USE
TEST/INSPECTION 1. Check that high tension coil wires do not touch any metal parts.
a. Short circuit.
Isolate and reroute wires.
SYMPTOM ENGINE STALLS.
CONDITION NORMAL USE
TEST/INSPECTION 1. Refer to IGNITION SYSTEM DIAGNOSTIC FLOW CHART.
SYMPTOM ENGINE IS MISFIRING — ERRATIC SPARK AT SPARK PLUG.
CONDITION RIDING ON WET SNOW.
1. Check if spark plug wires and/or spark plug cap seals are sealing out moisture.
a. Defective wires and/or seals.
Replace defective part.
TEST/INSPECTION
2. Check if ignition system wiring harness connectors are in good condition and/or are sealing out moisture.
a. Loose connectors, corroded terminals or defective parts.
Clean terminals and apply silicone dielectric grease. Replace defective parts.
CONDITION NORMAL USE
TEST/INSPECTION 1. Verify misfiring by observing flash of stroboscopic timing light; unplug connectors between
magneto/generator and vehicle wiring harness to isolate problem. Check condition of connectors.
a. Defective spark plug(s) and/or cable(s)/cap(s). Defective electrical system wiring harness and/or
accessories and/ignition cut-out switches. Condition of connector terminals.
Replace defective parts and/or repair damaged wires. Replace defective switch(es). Clean terminals and
apply silicone dielectric grease.
CONDITION RIDING IN DEEP AND THICK SNOW.
1. Perform all verifications outlined under ENGINE DOES NOT START — NO SPARK AT SPARK PLUG.TEST/INSPECTION
2. Check spark plugs. Proceed with spark plug analysis in order to identify source of problem.
a. Defective and/or worn spark plug(s) and/or cable(s) and/or cap(s). Engine related problem.
Replace defective part(s). Proceed with ignition system testing procedures. Perform engine analysis.
mmr2004-Rev 67
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