Mitsubishi Lancer Evolution 8. Manual - part 162
MPI – TROUBLESHOOTING
13A-34
ITEMS
Fault Symptoms
Checking
procedures
No communication between MUT-II/III and any other system
1
Communicatio
n with MUT
II/III
Only MUT-II/III and Engine ECU can communicate
2
The engine warning light does not come on immediately after turning ignition switch to
“ON “ position
3
Engine
warning light
Engine warning light remains lit. Does not go off.
4
Starting not possible (starter does not
turn over)
Starter does not function
5
Starting not possible
(starter turns over but no initial firing)
Starter functions and cranks, but there is no
combustion inside cylinders and engine does
not start
6
Starting not possible (fires, but not
fully)
Combustion in cylinders, but engine stalls
immediately
Starting
Poor starting (starting takes a long
time)
Engine starts, but cranking takes a long time
7
Irregular idling
(rough idling, hunting)
During idle running, engine speed fluctuates.
This can normally be seen in the tachometer
needle swinging, and vibrations felt through
the steering wheel, gear stick, and body
Incorrect idling speed
Does not idle at correct speed
Poor idling
Engine stalls when idling
(dies out)
During idling, the engine stalls irrespective of
whether the vehicle is moving
8
Engine stalls when pulling away from
standing (‘pass out’)
When vehicle is idling and throttle pedal is
depressed, or during operation, engine stalls
9
Engine stall
Engine stalls during deceleration
Engine stalls when decelerating.
10
Pulsating/discontinuous combustion
(hesitation, sag)
When throttle pedal is depressed in order to
accelerate from certain speeds, vehicle
response (engine speed) is delayed.
Furthermore, during acceleration, (engine
speed) drops momentarily.
These symptoms are generally referred to as
‘hesitation’. Severe hesitation is referred to as
‘sag’
Poor acceleration
Driving at steady speeds is smooth, but when
accelerating, the rate of acceleration does not
respond to increased throttle. So highest
speeds are not reached
Stumble
When pulling away from standing, engine
speed responds slowly to initial throttle pedal
movement
Surge
Driving at steady speeds, or when
accelerating, the vehicle repeatedly jerks
backwards and forwards
11
Acceleration shock
A major shock is generated on acceleration
12
Deceleration shock
A major shock is generated on deceleration
13
Knocking
Thudding noise like a dull hammering comes
from cylinder walls during driving, resulting in
rough driving.
14
Driving
Ignition mistiming
Discrepancy between firing timing and
standard values specified for timing.
15
Stopping
Run-on
(dieseling/pinking)
Engine continues to run after ignition switch is
turned to “LOCK” (OFF) position.
16
Exhaust fumes
Smelly, white smoke, black smoke
CO and HC densities are high when
idling
Exhaust fumes smell unusually strong.
Exhaust is white or black. CO and HC
densities are high when idling
17
Charging
Flat battery
Battery loses its charge immediately.
Or battery charging capacity is low
18
Overheating
Engine cooling water temperature unusually
high
19
Cooling
Radiator fan motor running abnormallyIrrespective of engine cooling water
temperature, when ignition switch is turn to
the ON position, the fan motor starts running
20
A/C
performance
A/C not effective
Air not cooled down. Or there is a
discrepancy with temperature set.
21
4. List of Fault Symptoms