Engine General Information and Diagnosis: 1A-12
Engine lacks power
(Defective control circuit
or sensor)
Low fuel pressure. Repair or replace.
Defective TP sensor. Replace.
Defective IAT sensor. Replace.
Defective CKP sensor. Replace.
Defective GP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
TP sensor out of adjustment. Adjust.
Defective STP sensor or STVA. Replace.
Defective ISC valve. Replace.
Imbalancing throttle valve
synchronization.
Adjust.
Engine overheats
(Defective engine internal
parts)
Heavy carbon deposit on piston crown. Clean.
Not enough oil in the engine. Add oil.
Defective oil pump or clogged oil circuit. Replace or clean.
Use of incorrect engine oil. Change.
Sucking air from intake pipe. Retighten or replace.
Defective cooling system. Refer to “Engine Cooling System Warning in
Section 1F (Page 1F-1)”.
Engine overheats (Lean
fuel/air mixture)
Short-circuited IAP sensor/lead wire. Repair or replace.
Short-circuited IAT sensor/lead wire. Repair or replace.
Sucking air from intake pipe joint. Repair or replace.
Defective fuel injector. Replace.
Defective ECT sensor. Replace.
Engine overheats (The
other factors)
Ignition timing too advanced due to
defective timing advance system (ECT
sensor, CKP sensor, GP sensor and
ECM.)
Replace.
Drive chain is too tight. Adjust.
Dirty or heavy exhaust
smoke
Worn piston rings or cylinders. Replace.
Too much engine oil in the engine. Check and drain excess oil.
Worn valve guides. Replace.
Scored or scuffed cylinder walls. Replace.
Worn valves stems. Replace.
Defective stem seals. Replace.
Worn oil ring side rails. Replace.
Condition Possible cause Correction / Reference Item
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