Suzuki GSX1400 Service Manual page 312

Complaint
Engine runs poorly
in high speed range.
Engine lacks power.
www.GSX1400FE.com
Symptom and possible causes
Defective air flow system
1. Clogged air cleaner element.
2. Defective throttle valve.
3. Defective secoundary throttle valve.
4. Sucking air from throttle body joint.
5. Defective ECM.
6. Imbalancing throttle valve synchronization.
Defective control circuit or sensor
1. Low fuel pressure.
2. Defective throttle position sensor.
3. Defective intake air temp. sensor.
4. Defective camshaft position sensor.
5. Defective crankshaft position sensor.
6. Defective gear position sensor.
7. Defective intake air pressure sensor.
8. Defective atmospheric pressure sensor.
9. Defective ECM.
10. Out of adjustment throttle position sensor.
11. Defective STP sensor and/or STV actuator.
Defective engine internal/electrical parts
1. Loss of valve clearance.
2. Weakened valve springs.
3. Out of adjustment valve timing.
4. Worn piston rings or cylinders.
5. Poor seating of valves.
6. Fouled spark plug.
7. Incorrect spark plug.
8. Clogged injector.
9. Out of adjustment throttle position sensor.
10. Clogged air cleaner element.
11. Imbalancing throttle valve synchronization.
12. Sucking air from throttle valve or vacuum hose.
13. Too much engine oil.
14. Defective fuel pump or ECM.
15. Defective crankshaft position sensor and
ignition coil.
Defective control circuit or sensor
1. Low fuel pressure.
2. Defective throttle position sensor.
3. Defective intake air temp. sensor.
4. Defective camshaft position sensor.
5. Defective crankshaft position sensor.
6. Defective gear position sensor.
7. Defective intake air pressure sensor.
8. Defective atmospheric pressure sensor.
9. Defective ECM.
10. Out of adjustment throttle position sensor.
11. Defective STP sensor and/or STV actuator.
SERVICING INFORMATION 8-7
Remedy
Clean or replace.
Adjust or replace.
Adjust or replace.
Repair or replace.
Replace.
Adjust.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Adjust.
Replace.
Repair.
Clean or replace.
Adjust or replace.
Clean.
Adjust.
Clean.
Adjust.
Retighten or replace.
Drain out excess oil.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Replace.