1989-Mitsu-Factory Manual · fuel system · страница 5 из 53 · Открыть оригинал PDF ↗
Диагностика и устранение неисправностей
When checking and correcting engine troubles, it is
important to start with inspection of the basic
systems. In case you have such troubles as (1)
engine start failure, (2) unstable idling or (3) poor ac-
celeration, therefore, you should first check the
following basic systems.
l Fusible link
l Fuse
(2) Body ground
(3) Fuel supply
l Fuel line
l Fuel filter
l Fuel pump
(4) Ignition system
0 Spark plug
l High-tension cable
l Distributor
l Ignition coil
(5) Emission control system
l PCVsystem
l EGR system
l Vacuum leak
(6) Others
l Ignition timing
l Idle speed
Troubles with the FBC system are often caused by
poor contact of harness connector. It is, therefore,
important to check harness connector contact.
| Symptom | Probable cause | Remedy |
|---|---|---|
| Engine will not start 01 start too hard (cranks | Carburetor Choke valve remains open-cold engine | Clean choke bore and link |
| W | Check and adjust choke breaker | |
| Electric choke malfunction | Check electricchoke bodyand chokevalve operation | |
| Needle valve sticking or clogged | Repair and repalce | |
| FBC system Engine coolant temperature sensor malfunction | Check by using checker (MD9984061 (Check component and replace if faulty) | |
| Vacuum hose disconnected or damaged | 1 Repair or replace | |
| Slow-cut solenoid valve malfunction | Check component | |
| Feedback solenoid valve malfunction | Check component | |
| Vacuum switch malfunction-cold engine | Check component | |
| Faulty Engine Control Unit | Replace | |
| Harness broken/short circuited or connector not connected securely | Repair or replace | |
| 3ough idle or engine jtallS | Carburetor Choke valve malfunction | Clean choke bore and link |
| Improperfast idle-cold engine | Adjust fast idle speed | |
| Improper idle adjustment | ~ Adjust idle speed | |
| Electric choke malfunction | Check choke body and choke valve operation | |
| Primary pilot jet clogged | Clean up or replace | |
| Dash pot malfunction | Adjust | |
| FBC system Slow-cut solenoid valve malfunction | Check drive signal by using checker (MD998406) Check component |
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