Mitsubishi Colt Ralliart. Manual — part 69

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-230

NOTE: In case of Past malfunction, M.U.T.-III CAN

bus diagnosis cannot detect the failure even if
there is malfunction in CAN bus, so that check
CAN busline in the same way as Intermittent mal-
function (Refer to GROUP 00

−

How to Use Trou-

bleshooting/Inspection Service Points

−

How to

Cope with Intermittent Malfunctions

P.00-13

The diagnosis codes being output to each ECU
with CAN communication can narrow down the
most suspected area (Refer to GROUP 54D

−

Diagnosis

−

CAN Bus Diagnosis Table

P.54D-13

PROBABLE CAUSES

• Failed harness and connector in CAN busline

• Failed A/C-ECU

• Failed engine-ECU <M/T> or engine-CVT-ECU

<CVT>

DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnosis

• Using M.U.T.-III, perform CAN busline diagnosis.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Correct CAN busline (Refer to GROUP 54D
− Diagnosis − CAN Bus Diagnosis Table

P.54D-13

), and then go to Step 6 .

STEP 2. M.U.T.-III other system diagnosis code

• Confirm whether the diagnosis code is output

from A/C-ECU.

Q: Is the diagnosis code set?

YES :

Perform the troubleshooting of A/C-ECU

(Refer to GROUP 55

− Troubleshooting −

Diagnostic Table Code Chart

P.55A-5

NO :

Go to Step 3 .

STEP 3. M.U.T.-III other system diagnosis codes
Confirm whether Diagnosis Code U1110 A/C-ECU
time-out is output from the following ECU having
CAN communication with A/C-ECU.

• ETACS-ECU

Q: Is the diagnosis code set?

YES :

Go to Step 4 .

NO :

Go to Step 5 .

STEP 4. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis code is output

from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Replace A/C-ECU, then go to Step 6 .

NO :

Intermittent malfunction in CAN busline
between engine-ECU <M/T> or
engine-CVT-ECU <CVT> and A/C-ECU
(Refer to GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-13

STEP 5. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis code is output

from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Replace engine-ECU <M/T> or

engine-CVT-ECU <CVT>, go to Step 6 .

NO :

Intermittent malfunction in CAN busline
between engine-ECU <M/T> or
engine-CVT-ECU <CVT> and A/C-ECU
(Refer to GROUP 00

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-13

STEP 6. M.U.T.-III diagnosis code

• Reconfirm whether the diagnosis code is output

from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.

1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.

Q: Is the diagnosis code set?

YES :

Go to Step 1 .

NO :

Check end.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-231

INSPECTION CHART FOR TROUBLE SYMPTOMS

M1131151501945

Items

Trouble symptom

Inspection
procedure
No.

Communication
with M.U.T.-III is
impossible

Communication with engine-ECU <M/T> or engine-CVT-ECU <CVT>
only is not possible

Engine warning
lamp

The engine warning lamp does not illuminate right after the ignition switch
is turned the ON position

The engine warning lamp remains illuminating and never goes out

Starting

Starting impossible
(No initial combustion) <M/T>

The starter is impossible to operate. 4

Starting impossible
(No initial combustion) <CVT>

The starter is impossible to operate. 5

Starting impossible
(Starter operative but no initial
combustion)

The starter is operative and cranks
the engine, but none of initial
combustion is in the cylinders and
the engine is not started.

Starting impossible
(Initial combustion but no complete
combustion)

The initial combustion occurs, but
the engine stalls soon due to the
incomplete combustion.

Improper starting
(Long time to start)

It is long cranking to start the engine.

Improper idling

Unstable idling
(Rough idling, hunting)

The engine speed is not constant
and changeable during the idling.
Usually, the judgment can be based
on the movement of the tachometer
pointer, also on the vibration
transmitted to the steering wheel, sift
lever, vehicle body and so on.

Improper idling speed

The proper idling speed is not
satisfied.

Engine stalled during idling
(Die out)

The engine stalls during the idling in
no relation to the vehicle movement.

Engine stalls

The engine stalls when starting the
car
(Pass out)

The engine stalls during the
operation, or when the accelerator
pedal is depressed from the idling.

The engine stalls when
decelerating

The engine stalls at the deceleration. 10

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-232

Driving

Engine does not revolve up

The engine speed is not higher when
the accelerator pedal is depressed.

Hesitation, sag

The response of vehicle speed
(engine speed) is delayed when the
accelerator pedal is depressed, or
the vehicle speed (engine speed) is
temporarily dropped during the
acceleration. These phenomena are
called "hesitation" and the serious
hesitation is called "sag".

Poor acceleration

The engine cannot obtain the
acceleration corresponding to the
degree of throttle opening although
the engine is smooth at the constant
speed.

Stumble

The engine speed increase is
delayed when the accelerator pedal
is initially depressed at the starting.

Surge

The vehicle body is repeated to
vibrate jollity in the forward and
backward directions at the constant
speed or acceleration.

The feeling of impact or vibration
when accelerating

The large impact feeling occurs at
the acceleration.

The feeling of impact or vibration
when decelerating

The large impact feeling occurs at
the deceleration.

Knocking

Sharp sound like a hammer striking
on the cylinder walls during the
driving can be heard and wrongly
affects the driving.

Ignition timing offset

The basic ignition timing is deviated
from the datum value.

Stopping

Run on (Dieseling)

The engine continues to run after the
ignition switch is in "LOCK " (OFF)
position.

Exhaust gas

Odor, white smoke, black smoke,
high-concentration CO/HC during
idling

The exhaust gas is extremely rank
odor, white smoke or black smoke.
The concentration of CO & HC is
high during the idling.

Charging
performance

Battery run down

The battery is soon rundown or the
charging ability of battery is small.

Items

Trouble symptom

Inspection
procedure
No.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-233

PROBLEM SYMPTOMS TABLE

CAUTION

If the ignition switch is turned to the "ON" position with a connector or other electrical connections
disconnected during troubleshooting of a system, a diagnosis code may be set for other systems.
After finishing troubleshooting, check diagnosis codes for all systems, and if any codes have been
set, erase these codes.

Cooling
performance

Overheating

The temperature of engine cooling
water is extremely high.

Abnormal rotation of fan motor

The fan motor is abnormally rotated
when the ignition switch is in ON
position in no relation to the engine
cooling water temperature.

A/C performance

Poor A/C performance

The temperature of air cooling from
A/C is not efficient or very far from
the target temperature.

Items

Trouble symptom

Inspection
procedure
No.

Trouble symptom