Engine General Information and Diagnosis: 1A-10
Engine runs poorly in
high speed range
(Defective control circuit
or sensor)
Low fuel pressure.
Repair or replace.
Defective TP sensor.
Replace.
Defective IAT sensors.
Replace.
Defective IAP sensor.
Replace.
Defective AP sensor.
Replace.
Defective ECM.
Replace.
TP sensor out of adjustment.
Adjust.
Defective STP sensor/STVA.
Replace.
Defective fuel tank pressure control
valve.
Replace.
Engine lacks power
(Defective engine internal/
electrical parts)
Loss of valve clearance.
Adjust.
Weakened valve springs.
Replace.
Valve timing out of adjustment.
Adjust.
Worn piston rings or cylinder.
Replace.
Poor seating of valves.
Repair.
Fouled spark plug.
Clean or replace.
Incorrect spark plugs.
Adjust or replace.
Clogged injector.
Clean.
TP sensor out of adjustment.
Adjust.
Clogged air cleaner element.
Clean.
Sucking air from throttle valve.
Replace.
Too much engine oil.
Drain out excess oil.
Defective fuel pump or ECM.
Replace.
Defective CKP sensor and ignition coil.
Replace.
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 IAP sensor.
Replace.
Defective AP sensor.
Replace.
Defective ECM.
Replace.
TP sensor out of adjustment.
Adjust.
Defective STP sensor or STVA.
Replace.
Defective fuel tank pressure control
valve.
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.
Use of incorrect engine oil.
Change.
Sucking air from intake pipe.
Retighten or replace.
Defective cooling system.
Refer to “Engine Cooling Symptom Diagnosis
in Section 1F (Page 1F-4)”.
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 and ECM.)
Replace.
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 wall.
Replace.
Worn valves stems.
Replace.
Defective stem seals.
Replace.
Worn oil ring side rails.
Replace.
Condition
Possible cause
Correction / Reference Item
Summary of Contents for 2009 LT-A750XK9
Page 2: ......
Page 4: ......
Page 5: ...SUPPLEMENTS L LT A750XK9 09 MODEL 10 LT A750XPK9 09 MODEL 11 ...
Page 29: ...0A 15 General Information 99565 01010 013 CD ROM Ver 13 ...
Page 57: ...0B 28 Maintenance and Lubrication 09915 40610 Oil filter wrench Page 0B 12 Page 0B 12 ...
Page 68: ...0C 11 Service Data ...
Page 310: ...1K 5 Exhaust System ...
Page 482: ...4D 6 Parking Brake ...
Page 528: ...6B 13 Steering Handlebar ...
Page 581: ......