State 3 Engine Rotation Is Unstable Or; Range - TOHATSU MD 70-90C2 Service Manual

State 3 Engine rotation is unstable or surging occurs in low speed range.
Check throttle position
sensor and crank position
sensor connectors for
connections and resistance.
Normal?
YES
Check throttle link and throttle
cam for play and wear.
Normal?
YES
Check intake manifold
for air leak.
Normal?
YES
Check that combustion
occurs in all cylinders.
Combustion
occurs?
YES
Check ignition
system and/or fuel
system.
TLDI 75/90C2 2010
NO
Repair or replace
defective parts.
NO
Adjust throttle link or
replace throttle cam
or body.
NO
Repair or replace
defective parts.
NO
Check ignition
system and/or fuel
system.
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