Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
176
4. Symptom List
Symptom List
Items
Symptoms
Failure of starting
Starter drags the engine, but there is no combustion in cylinder and the engine
does not start.
Extinguishment after
combustion
There is combustion in cylinder, but the engine extinguishes immediately.
Start
Hard to start
Engine starts after the crankshaft rotates a while.
Hunting
Engine does not maintain a constant speed and the speed changes within range
of idle speed.
Fluctuation of idle
Usually, it can be determined with the swing of tachometer pointer and the
vibration transferred to the steering wheel, selector rod and body etc.
Incorrect idle
Engine is running idly at the incorrect rotation speed.
Extinguishment of engine
(with deceleration)
When releasing the accelerator pedal, no matter whether the vehicle is moving,
the engine stops.
Stability
of idle
speed
Extinguishment of engine
(with acceleration)
When the accelerator pedal is depressed or being depressed, the engine stops.
Vehicle surge, drop of
speed
The phenomenon of “vehicle surge” refers to that the vehicle speed (rotation
speed of engine) responds slow when there is a need to accelerate and depress
down the accelerator pedal at the current vehicle speed or the temporary decline
of vehicle speed (rotation speed of engine) during acceleration.
Poor acceleration
Poor acceleration refers to that the vehicle is unable to acquire acceleration with
the opening of air throttle even with stable acceleration; or refers to the
disability to reach the maximum vehicle speed.
Instability
When firstly depressing down the accelerator pedal to speed up, engine speed
increases slowly.
Shock
There is huge shock or vibration of engine with accelerating or decelerating.
Surge
There is repeatedly forward surge when traveling with constant or variable
speed.
Driving
Knock
There is a strong voice like the hammer against the cylinder wall during the
driving which is harmful to driving.
Parking
Keep running(fail to
stop)
5. General Trouble Inspection
Engine trouble inspection should begin with the basic system. In case of starting failure, unstable idle or
insufficient fuel supply, begin the following basic systems:
a.
power supply: battery, fusible link and fuse wire
b.
Grounding
c.
Fuel supply: fuel pipe, fuel filter, fuel pump
d.
Ignition system: spark plug, high tension line, ignition coil.
e.
Emission control system: Leakage of vacuum system.
f.
Others: ignition timing and idle.
The trouble of electronic control system of engine is generally caused by poor contact of the harness
connector. All the harness connectors should be checked to verify whether they are connected correctly.
