Mitsubishi Lancer Evolution VI. Manual — part 32
MPI –
Troubleshooting
13-16
Code No. 44 Ignition coil and power transistor unit system
Probable cause
Range of Check
D
Engine speed is approx. 50 – 4,000 r/min
D
Engine is not cranking.
Set conditions
D
Abnormal rotation due to misfire is detected by crank angle sensor (Either one
of coils fails).
D
Malfunction of the ignition coil
D
Improper connector contact, open or short-circuited
harness wire of the ignition primary circuit
D
Malfunction of the engine-ECU
OK
OK
Check trouble symptom.
Measure at the ignition coil connectors
A-110, A-111
D
Disconnect the connector, and
measure at the harness.
1. Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage
2. Voltage between 3 and earth
(Engine: Cranking)
OK: 0.5– 4.0 V
3. Continuity between the 2 and earth
OK: Continuity
1. NG
Check the following connectors:
B-65, B-76
OK
Check trouble symptom.
NG
Check the harness wire between the
ignition coil and ignition switch connec-
tor, and repair if necessary.
2. NG
Check the following connector: B-59
NG
Repair
NG
Check the harness wire between the
engine-ECU and ignition coil connector.
OK
Replace the engine-ECU.
NG
Repair
3. NG
Check the harness wire between the
ignition coil connector and earth, and
repair if necessary.
Check the following connectors:
A-110, A-111
NG
Repair
Check trouble symptom.
NG
Check the following items.
D
Check the spark plugs, spark plug
cables.
D
Check the compression pressure.
NG
Repair
Check the ignition coil. (Refer to
GROUP 16 – IGNITION SYSTEM.)
NG
Replace
OK
OK
MPI –
Troubleshooting
13-17
Code No. 64 Alternator FR terminal system
Probable cause
Range of Check
D
Engine speed is approx. 50 r/min or more
Set Conditions
D
The input voltage from the alternator FR terminal is higher than 4.5 V for 20 seconds.
D
Open circuit in alternator FR terminal circuit
D
Malfunction of the engine-ECU
Measure at the alternator connector A-05.
D
Connect the connector. (Use the test harness: MB991519.)
D
Voltage between 4 (blue clip) and earth
(Engine: Idling)
(Radiator fan: Stopped)
(Headlamp: OFF
→
ON)
(Brake lamp: OFF
→
ON)
(Rear window defogger switch: OFF
→
ON)
OK: Voltage drops 0.2 to 3.5 V
OK
Replace the engine-ECU.
NG
Measure at the alternator connector A-05.
D
Disconnect the connector, and measure at the harness side.
D
Voltage between 4 and earth
(Ignition switch: ON)
OK: 4.8 – 5.2 V
NG
Check the following
connectors: B-60, A-88
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and the alternator con-
nector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check the following connector: A-05
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and the alternator
connector.
NG
Repair
OK
Replace the alternator.
MPI –
Troubleshooting
13-18
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure
No.
Reference page
Communication
with MUT-
II
is
Communication with all systems is impossible.
1
13-20
with MUT-
II
is
impossible.
Communication with engine-ECU only is impossible.
2
13-20
Engine warning
lamp and
related parts
The engine warning lamp does not illuminate right after the
ignition switch is turned to the ON position.
3
13-21
related parts
The engine warning lamp remains illuminating and never goes
out.
4
13-21
Starting
No initial combustion (starting impossible)
5
13-22
Initial combustion but no complete combustion
(starting impossible)
6
13-23
Long time to start (improper starting)
7
13-24
Idling stability
(Improper idling)
Unstable idling (Rough idling, hunting)
8
13-25
(Improper idling)
Idling speed is high. (Improper idling speed)
9
13-26
Idling speed is low. (Improper idling speed)
10
13-27
Idling stability
(Engine stalls)
When the engine is cold, it stalls at idling. (Die out)
11
13-28
(Engine stalls)
When the engine is hot, it stalls at idling. (Die out)
12
13-29
The engine stalls when starting the car. (Pass out)
13
13-30
The engine stalls when decelerating.
14
13-30
Driving
Hesitation, sag or stumble
15
13-31
The feeling of impact or vibration when accelerating
16
13-31
The feeling of impact or vibration when decelerating
17
13-32
Poor acceleration
18
13-32
Surge
19
13-33
Knocking
20
13-33
Dieseling
21
13-33
Too high CO and HC concentration when idling
22
13-34
Low alternator output voltage (approx. 12.3 V)
23
13-35
MPI –
Troubleshooting
Vehicle
speed
Initial accel-
erator pedal
depression
Normal
Hesitation
Sag
Time
(Figure 1)
(Figure 2)
Normal
Initial accel-
erator pedal
depression
Idling
Stumble
Time
Vehicle
speed
13-19
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
Items
Symptom
Starting
Won’t start
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
Fires up and dies
There is combustion within the cylinders, but then the engine soon stalls.
Hard starting
Engine starts after cranking a while.
Idling
stability
Hunting
Engine speed doesn’t remain constant; changes at idle.
stability
Rough idle
Usually, a judgement can be based upon the movement of the tachometer
pointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
This is called rough idle.
Incorrect idle speed
The engine doesn’t idle at the usual correct speed.
Engine stall
(Die out)
The engine stalls when the foot is taken from the accelerator pedal, regardless
of whether the vehicles is moving or not.
Engine stall
(Pass out)
The engine stalls when the accelerator pedal is depressed or while it is being
used.
Driving
Hesitation, Sag
“Hesitation” is the delay in response of the vehicle speed (engine speed) that
occurs when the accelerator is depressed in order to accelerate from the speed
at which the vehicle is now traveling, or a temporary drop in vehicle speed
(engine speed) during such acceleration. Serious hesitation is called “sag”.
(Refer to Figure 1.)
Poor acceleration
Poor acceleration is inability to obtain an acceleration corresponding to the
degree of throttle opening, even though acceleration is smooth, or the inability
to reach maximum speed.
Stumble
Engine speed increase is delayed when the accelerator pedal is initially
depressed for acceleration. (Refer to Figure 2.)
Shock
The feeling of a comparatively large impact or vibration when the engine is
accelerated or decelerated.
Surge
This is repeated surging ahead during constant speed travel or during variable
speed travel.
Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which
adversely affects driving.
Stopping
Run on
(“Dieseling”)
The condition in which the engine continues to run after the ignition switch is
turned to OFF. Also called “Dieseling”.
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