Suzki Burgman AN400. Manual - part 79

 

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Suzki Burgman AN400. Manual - part 79

 

 

SERVICING INFORMATION     9-3

C44

Heated oxygen sensor 
(HO2S) [E-02,19]

During O2 feedback control, O2 sensor voltage is higher than 
the specification or lower than the specification.
No signal is detected during engine operation, or no electrical 
power is supplied from battery.
HO2S lead wire/coupler connection.
Battery voltage supply to the HO2S.

9-4     SERVICING INFORMATION

ENGINE

Complaint

Symptom and possible causes

Remedy

Engine will not start
or is hard to start.

 Compression too low

1. Valve clearance out of adjustment.
2. Worn valve guides or poor seating of valves.
3. Mistimed valves.
4. Excessively worn piston rings.
5. Worn-down cylinder bore.
6. Starter motor cranks too slowly.
7. Poor seating of spark plug.
8. Decomp cam not working.

 Plug not sparking

1. Fouled spark plug.
2. Wet spark plug.
3. Defective ignition coil.
4. Open or short in high-tension cord.
5. Defective crankshaft position sensor.
6. Defective ECM.
7. Open-circuited wiring connections.
8. Defective spark plug.
9. Defective spark plug cap.

 No fuel reaching the intake manifold

1. Clogged fuel filter or fuel hose.
2. Defective fuel pump.
3. Defective fuel pressure regulator.
4. Defective fuel injector.
5. Defective fuel pump relay.
6. Defective ECM.
7. Open-circuited wiring connections.

 Incorrect fuel/air mixture

1. Throttle position sensor out of adjustment.
2. Defective fuel pump.
3. Defective fuel pressure regulator.
4. Defective throttle position sensor.
5. Defective crankshaft position sensor.
6. Defective intake air pressure sensor.
7. Defective ECM.
8. Defective engine coolant temperature sensor.
9. Defective intake air temperature sensor.

Adjust.
Repair or replace.
Adjust.
Replace.
Replace.
See electrical section.
Retighten.
Repair or replace.

Clean.
Clean and dry.
Replace.
Replace.
Replace.
Replace.
Repair or Replace.
Replace.
Replace.

Clean or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Check and repair.

Adjust.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.

SERVICING INFORMATION     9-5

Complaint

Symptom and possible causes

Remedy

Engine idles poorly.

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.

Adjust.
Replace or repair.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.

Engine stalls often.

 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.

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.

9-6     SERVICING INFORMATION

Complaint

Symptom and possible causes

Remedy

Noisy engine.

 Excessive valve chatter

1. Too large valve clearance.
2. Weakened or broken valve springs.
3. Worn rocker arm or cam surface.
4. Worn and burnt camshaft journal.

 Noise seems to come from piston

1. Worn down piston or cylinder.
2. Combustion chamber fouled with carbon.
3. Worn piston pins or piston pin bore.
4. Worn piston rings or ring grooves.

 Noise seems to come from timing chain

1. Stretched chain.
2. Worn sprocket.
3. Tension adjuster not working.

 Noise seems to come from crankshaft

1. Rattling bearings due to wear.
2. Worn and burnt journal bearings.
3. Too large thrust clearance.

 Noise seems to come from transmission

1. Worn or rubbing gears.
2. Worn splines.
3. Worn bearings.

 Noise seems to come from water pump

1. Too much play on water pump shaft bearing.
2. Worn or damaged impeller shaft.
3. Worn or damaged mechanical seal.
4. Contact between water pump case and impeller.

Adjust.
Replace.
Replace.
Replace.

Replace.
Clean.
Replace.
Replace.

Replace.
Replace.
Repair or replace.

Replace.
Replace.
Replace bearing.

Replace.
Replace.
Replace.

Replace.
Replace.
Replace.
Replace.

Engine runs poorly 
in high speed range.

 Defective engine internal/electrical parts

1. Weakened valve springs.
2. Worn camshaft.
3. Valve timing out of adjustment.
4. Incorrect spark plug gap.
5. Ignition not advanced sufficiently due to poorly 

working timing advance circuit.

6. Defective ignition coil.
7. Defective crankshaft position sensor.
8. Defective ECM.
9. Clogged air cleaner element.

10. Clogged fuel hose, resulting in inadequate fuel 

supply to injector.

11. Defective fuel pump.
12. Defective throttle position sensor.

Replace.
Replace.
Adjust.
Adjust.
Replace ECM.

Replace.
Replace.
Replace.
Clean.
Clean and prime.

Replace.
Replace.

 

 

 

 

 

 

 

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