Suzuki AN400 Service Manual page 333

Complaint
Engine idles poorly.
Engine stalls often.
Symptom and possible causes
1. Valve clearance out of adjustment.
2. Poor seating of valves.
3. Defective valve guides.
4. Worn down camshaft.
5. Too wide spark plug gap.
6. Defective ignition coil.
7. Defective crankshaft position sensor.
8. Defective ECM.
9. Defective throttle position sensor.
10. Defective fuel pump.
11. Damaged or cracked vacuum hose.
12. Defective IAC valve.
Incorrect fuel/air mixture
1. Defective intake air pressure sensor or circuit.
2. Clogged fuel filter.
3. Defective fuel pump.
4. Defective fuel pressure regulator.
5. Damaged or cracked vacuum hose.
6. Defective engine coolant temperature sensor.
7. Defective thermostat.
8. Defective intake air temperature sensor.
Fuel injector improperly operating
1. Defective fuel injector.
2. No injection signal from ECM.
3. Open or short circuited wiring connection.
4. Defective battery or low battery voltage.
Control circuit or sensor improperly operating
1. Difective ECM.
2. Defective fuel pressure regulator.
3. Defective throttle position sensor.
4. Defective intake air temperature sensor.
5. Defective crankshaft position sensor.
6. Defective engine coolant temperature sensor.
7. Defective fuel pump relay.
Engine parts improperly operating
1. Fouled spark plug.
2. Defective crankshaft position sensor or ECM.
3. Clogged fuel hose.
4. Valve clearance out of adjustment.
SERVICING INFORMATION
Remedy
Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Repair or Replace.
Repair or Replace.
Replace or recharge.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Clean.
Adjust.
9-5