Engine General Information and Diagnosis: 1A-9
Engine will not start or is
hard to start (Incorrect
fuel/air mixture)
TP sensor out of adjustment. Adjust.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective CKP sensor. Replace.
Defective IAP sensor. Replace.
Defective ECM. Replace.
Defective ECT sensor. Replace.
Defective IAT sensor. Replace.
Defective AP sensor. Replace.
Clogged ISC valve air passage way. Repair or replace.
Engine idles poorly Valve clearance out of adjustment. Adjust.
Poor seating of valve. Replace or repair.
Defective valve guide. Replace.
Worn down camshaft. Replace.
Too wide spark plug gap. Adjust or replace.
Defective ignition coil/plug cap. Replace.
Defective CKP sensor. Replace.
Defective ECM. Replace.
Defective TP sensor. Replace.
Defective fuel pump. Replace.
Imbalanced throttle valve. Adjust.
Damaged or cranked vacuum hose. Replace.
Damaged or clogged ISC valve. Repair or replace.
ISC incorrect learning. Reset learned value.
Engine stalls often
(Incorrect fuel/air mixture)
Defective IAP sensor or circuit. Repair or replace.
Clogged fuel filter. Clean or replace.
Defective fuel pump. Replace.
Defective fuel pressure regulator. Replace.
Defective ECT sensor. Replace.
Defective thermostat. Replace.
Defective IAT sensors. Replace.
Damaged or cracked vacuum hose. Replace.
Damaged or cogged ISC valve. Replace or repair.
Engine stalls often (Fuel
injector improperly
operating)
Defective fuel injector. Replace.
No injection signal from ECM. Repair or replace.
Open or short circuited wiring
connection.
Repair or replace.
Defective battery or low battery voltage. Replace or recharge.
Engine stalls often
(Control circuit or sensor
improperly operating)
Defective ECM. Replace.
Defective fuel pressure regulator. Replace.
Defective TP sensor. Replace.
Defective IAT sensors. Replace.
Defective CMP sensors. Replace.
Defective CKP sensor. Replace.
Defective ECT sensor. Replace.
Defective fuel pump relay. Replace.
Defective ISC valve. Replace.
ISC incorrect learning.
Reset learned value.
Engine st
alls of
ten
(Engine internal parts
improperly operating)
Fouled spark plug. Clean.
Defective CKP sensor or ECM. Replace.
Clogged fuel hose. Clean.
Out of valve clearance adjustment. Adjust.
Noisy engine (Excessive
valve chatter)
Too large valve clearance. Adjust.
Weakened or broken valve spring. Replace.
Worn tappet or cam surface. Replace.
Worn or burnt camshaft journal. Replace.
Condition Possible cause Correction / Reference Item
Manuals by Motomatrix / The Solution For Lost Motorcycle Coded Keys
email: info@motomatrix.co.uk / www.motomatrix.co.uk
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