Ignition System - TOHATSU MD 70-90C2 Service Manual

Check spark plugs.
Normal?
YES
Use spark tester to check
ignition sparks.
Spark weak?
No spark?
YES
Check stop switch and main
switch key.
Normal?
YES
Check connection of plug cap
and resistance.
Normal?
YES
Check ignition coil resistance.
Normal?
YES
Check ECU.
TLDI 75/90C2 2010

Ignition System

· When testing, put electrode cap assuredly to prevent
direct contact with spark tester wiring and leak of
electrical current.
· Keep flammable gas, fuel, oil away from tester to
prevent them from catching sparks.
NO
Check pick up
(crank position sensor)
coil resistance.
Normal?
Check fuel system and
compression pressure.
NO
Clean and adjust spark
plugs, or replace.
WARNING
NO
Replace pick up coil.
Adjust gap between the
coil and encoder.
YES
NO
Replace stop switch or
main switch key.
NO
Repair or replace plug
cap.
NO
Replace ignition coil.
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