Ignition System - TOHATSU MFS25 Service Manual

O
Troubleshooting
K
Check spark plugs.
Normal?
YES
Use spark tester to check
ignition sparks.
Sparks are weak?
No sparks?
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.
9-10

Ignition System

• When testing, put electrode cap assuredly to prevent
direct contact with spark tester wiring and leak of
electrical current.
• Keep inflammable gas, fuel, oil and fat away from tester
to prevent them from catching sparks.
NO
Check pulser coil resistance.
Normal?
Check fuel system and
compression pressure.
NO
Clean and adjust
spark plug, or replace.
WARNING
NO
YES
NO
Replace stop switch or
main switch key.
NO
Repair or replace plug cap.
NO
Replace pulser coil
Replace ignition coil.
25/30 2006