1A-12 Engine General Information and Diagnosis:
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 switch. Replace.
Defective IAP sensor. Replace.
Defective AP sensor. Replace.
TP sensor out of adjustment. Adjust.
Defective STP sensor and/or STVA. Replace.
Defective EXCVA. Replace.
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.
Sucking air from intake pipe. Retighten or replace.
Use of incorrect engine oil. Change.
Defective cooling system. See radiator section.
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 (Other
factors)
Ignition timing is too advanced due to
defective timing advance system (ECT
sensor, GP switch, CKP sensor or
ECM).
Replace.
Too tight drive chain. Adjust.
ISC inconnect learning. Reset learned value.
Dirty or heavy exhaust
smoke
Too much engine oil. Check with inspection window, drain out
excess oil.
Worn piston ring or cylinder. Replace.
Worn valve guide. Replace.
Scored or scuffed cylinder wall. Replace.
Worn valve stem. Replace.
Defective stem seal. Replace.
Worn oil ring side rail. Replace.
Condition Possible cause Correction / Reference Item
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