Mitsubishi Lancer Evolution VI. Manual - part 32

 

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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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