Suzuki SFV650 Service Manual page 74

1A-11 Engine General Information and Diagnosis:
Condition
Engine runs poorly in
high speed range
(Defective engine internal/
electrical parts)
Engine runs poorly in
high speed range
(Defective air flow
system)
Engine runs poorly in
high speed range
(Defective control circuit
or sensor)
Engine lacks power
(Defective engine internal/
electrical parts)
Engine lacks power
(Defective control circuit
or sensor)
Possible cause
Weakened valve spring.
Worn camshafts.
Valve timing out of adjustment.
Too narrow spark plug gaps.
Ignition not advanced sufficiently due to
poorly working timing advance circuit.
Defective ignition coils.
Defective CKP sensor.
Defective ECM.
Clogged air cleaner element.
Clogged fuel hose, resulting in
inadequate fuel supply to injector.
Defective fuel pump.
Defective TP sensor.
Defective STP sensor or STVA.
Clogged air cleaner element.
Sucking air from throttle body joint.
Defective ECM.
Imbalancing throttle valve
synchronization.
Defective STP sensor or STVA.
Low fuel pressure.
Defective TP sensor.
Defective IAT sensors.
Defective CKP sensor.
Defective GP sensor.
Defective IAP sensors.
Defective ECM.
TP sensor out of adjustment.
Defective STP sensor and/or STVA.
Loss of valve clearance.
Weakened valve springs.
Valve timing out of adjustment.
Worn piston rings or cylinders.
Poor seating of valves.
Fouled spark plugs.
Incorrect spark plugs.
Clogged fuel injectors.
TP sensor out of adjustment.
Clogged air cleaner element.
Imbalancing throttle valve
synchronization.
Sucking air from throttle valve or
vacuum hose.
Too much engine oil.
Defective fuel pump or ECM.
Defective CKP sensor and ignition coils. Replace.
Defective STP sensor or STVA.
Low fuel pressure.
Defective TP sensor.
Defective IAT sensor.
Defective CKP sensor.
Defective GP sensor.
Defective IAP sensors.
TP sensor out of adjustment.
Defective STP sensor and/or STVA.
Correction / Reference Item
Replace.
Replace.
Adjust.
Adjust.
Replace ECM.
Replace.
Replace.
Replace.
Clean.
Clean and prime.
Replace.
Replace.
Replace.
Clean or replace.
Repair or replace.
Replace.
Adjust.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Replace.
Adjust.
Replace.
Adjust.
Retighten or replace.
Drain out excess oil.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.