Suzuki GSF1250 Service Manual page 79

Condition
Engine lacks power
(Defective control circuit
or sensor)
Engine overheats
(Defective engine internal
parts)
Engine overheats (Lean
fuel/air mixture)
Engine overheats (The
other factors)
Dirty or heavy exhaust
smoke
Possible cause
Low fuel pressure.
Defective TP sensor.
Defective IAT sensor.
Defective CKP sensor.
Defective GP sensor.
Defective IAP sensor.
Defective ECM.
Defective STP sensor or STVA.
Heavy carbon deposit on piston crown. Clean.
Not enough oil in the engine.
Defective oil pump or clogged oil circuit. Replace or clean.
Use of incorrect engine oil.
Sucking air from intake pipe.
Defective cooling system.
Short-circuited IAP sensor/lead wire.
Short-circuited IAT sensor/lead wire.
Sucking air from intake pipe joint.
Defective fuel injector.
Defective ECT sensor.
Ignition timing too advanced due to
defective timing advance system (ECT
sensor, CKP sensor, GP sensor and
ECM.)
Drive chain is too tight.
ISC bad learning.
Worn piston rings or cylinders.
Too much engine oil in the engine.
Worn valve guides.
Scored or scuffed cylinder walls.
Worn valves stems.
Defective stem seals.
Worn oil ring side rails.
Engine General Information and Diagnosis:
Correction / Reference Item
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Add oil.
Change.
Retighten or replace.
Refer to "Cooling Circuit Diagram in Section 1F
(Page 1F-2)".
Repair or replace.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace.
Adjust.
Reset learned value.
Replace.
Check and drain excess oil.
Replace.
Replace.
Replace.
Replace.
Replace.
1A-10