Troubleshooting; Fi System Malfunction Code And Defective Condition; Engine - Suzuki TU250X Service Manual

10-2 SERVICING INFORMATION

TROUBLESHOOTING

FI SYSTEM MALFUNCTION CODE AND DEFECTIVE CONDITION

(4-26 to -28)

ENGINE

Complaint
Engine will not start
or is hard to start.
Symptom and possible causes
Compression too low
1. Valve clearance out of adjustment
2. Worn valve guides or poor seating of valves
3. Mistiming valves
4. Excessively worn piston rings
5. Worn-down cylinder bore
6. Too slowly starter motor cranks
7. Poor seating of spark plug
Plug not sparking
1. Fouled spark plug
2. Wet spark plug
3. Defective ignition coil
4. Defective CKP sensor
5. Defective ECM
6. Open-circuited wiring connections
No fuel reaching the intake manifold
1. Clogged fuel mesh filter or fuel hose
2. Defective fuel pump
3. Defective fuel pressure regulator
4. Defective fuel injector
5. Defective ECM
6. Open-circuited wiring connections
Incorrect fuel/air mixture
1. TP sensor out of adjustment
2. Defective fuel pump
3. Defective fuel pressure regulator
4. Defective TP sensor
5. Defective CKP sensor
6. Defective IAP sensor
7. Defective ECM
8. Defective ET sensor
9. Defective IAT sensor
Remedy
Adjust.
Repair or replace.
Adjust.
Replace.
Replace.
See electrical section.
Retighten.
Clean.
Clean and dry.
Replace.
Replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.
Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.