Mitsubishi Colt Ralliart. Manual — part 728

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-237

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

• Reconfirm whether the diagnosis code is output

from engine-ECU.

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 output?

YES :

Replace engine-ECU, and then go to Step

6.

NO :

Intermittent malfunction in the CAN busline
between the engine-ECU and ABS-ECU
(Refer to GROUP 00

− 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.

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 output?

YES :

Go to Step 1.

NO :

Check end.

Code No. U1106: EPS-ECU Time-out

CAUTION

Perform the CAN bus-line diagnosis whenever
the diagnosis code U1106 is set in the
engine-ECU.

CAUTION

Replace the ECU only after confirming that the
communication circuits are normal.

TROUBLE JUDGEMENT

Check Conditions

• Ignition switch is in "ON" position.

• Battery Voltage is more than 10 V.

• Cranking switch is in the OFF position or 3 sec-

onds after turning the cranking from ON to OFF.

Judgement Criterion

• Signals from the EPS-ECU via the CAN bus-line

cannot be received.

COMMENTS ON TROBLE SYMPTOMS

Current malfunction

• Most possible malfunctions are defects in CAN

bus-line harnesses and connectors between the
engine-ECU and ESP-ECU, malfunction in the
ESP-ECU power supply system, or malfunction
of the ESP-ECU or engine-ECU.

Past malfunction

• Focus on diagnosing that the harness and the

connector have malfunction in the CAN busline
between the engine-ECU and the EPS-ECU, or
the power supply system in the EPS-ECU has
malfunction. The diagnosis procedure is referred
to strategy for Intermittent malfunction (Refer to
GROUP00

− How to use Troubleshooting/Inspec-

tion Service Points

− How to Cope with Intermit-

tent Malfunctions

P.00-13

).

NOTE: In the case of the previous malfunction, mal-

function cannot be found through the diagnose of
M.U.T.-III

− CAN busline even if the CAN busline

has malfunction; therefore check for the CAN
busline in the same way as Intermittent malfunc-
tion (Refer to GROUP00

− How to use Trouble-

shooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-13

). By

the diagnosis code, which is output to the ECU
where the CAN communication is performed, can
narrow down the area to the most suspected
place

P.54D-13

).

PROBABLE CAUSES

• Failed harnesses and connectors in the CAN

busline

• Failed EPS-ECU

• Failed engine-ECU

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-238

DIAGNOSIS PROCEDURE

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 :

Repair the CAN busline (Refer to GROUP
54D

− Troubleshooting − CAN Bus

Diagnosis Table

P.54D-13

). After repairing

the CAN busline, go to Step 6.

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

• Check whether diagnosis code is output from

ESP-ECU.

Q: Is the diagnosis code output?

YES :

Carry out troubleshooting of the EPS (Refer

to GROUP 37

− Troubleshooting − Check

Chart for Diagnosis codes

P.37-9

).

NO :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis codes
Check whether the diagnosis code U1106: EPS-ECU
time-out is set in the following ECU that are commu-
nicating with the EPS-ECU via the CAN bus.

• Meter-A/C-ECU

Q: Is the diagnosis code output?

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.

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 output?

YES :

Replace EPS-ECU, and then go to Step 6.

NO :

Intermittent malfunction in the CAN busline
between the engine-ECU and EPS-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.

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 output?

YES :

Replace engine-ECU, and then go to Step

6.

NO :

Intermittent malfunction in the CAN busline
between the engine-ECU and EPS-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.

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 output?

YES :

Go to Step 1.

NO :

Check end.

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-239

Code No. U1108: Combination Meter Time-out

CAUTION

Perform CAN bus-line diagnosis whenever the
diagnosis code U1108 is set in the engine-ECU.

CAUTION

Replace the ECU only after confirming that the
communication circuits are normal.

TROUBLE JUDGEMENT

Check Conditions

• Ignition switch is in "ON" position.

• Battery Voltage is more than 10 V.

• Cranking switch is in the OFF position or 3 sec-

onds after turning the cranking switch from ON to
OFF.

Judgement Criterion

• Signals from the meter-A/C-ECU via the CAN

bus-line cannot be received.

COMMENTS ON TROBLE SYMPTOMS

Current malfunction

• Most possible malfunctions are defects in CAN

bus-line harnesses and connectors between the
engine-ECU and meter-A/C-ECU, malfunction in
the meter-A/C-ECU power supply system, or mal-
function of the meter-A/C-ECU or engine-ECU.

Past malfunction

• Focus on diagnosing malfunction of the harness

and connector in CAN busline between
engine-ECU and combination meter as well as
malfunction in the power supply system of combi-
nation meter (Refer to GROUP 00

− How to use

Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-13

).

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

−

Troubleshooting

− CAN Bus Diagnosis Table

P.54D-13

).

PROBABLE CAUSES

• Failed harnesses and connectors

• Failed meter-A/C-ECU

• Failed engine-ECU

DIAGNOSIS PROCEDURE

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 :

Repair the CAN busline (Refer to GROUP
54D

− Troubleshooting − CAN Bus

Diagnosis Table

P.54D-13

). After repairing

the CAN busline, go to Step 6.

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

• Check whether diagnosis codes is output from

meter-A/C-ECU.

Q: Is the diagnosis code output?

YES :

Perform troubleshooting of the combination

meter (Refer to GROUP 54A

−

Troubleshooting

− Check Chart for

Diagnosis Codes

P.54A-31

).

NO :

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis codes
Check whether the diagnosis code U1108: A/C-ECU
time-out is output from the following ECU having
CAN communication with the meter-A/C-ECU.

• ETACS-ECU

Q: Is the diagnosis code output?

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.

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 output?

YES :

Replace meter-A/C-ECU, and then go to

Step 6.

NO :

Intermittent malfunction in the CAN busline
between the engine-ECU and
meter-A/C-ECU (Refer to GROUP 00

− How

to use Troubleshooting/Inspection Service
Points

− How to Cope with Intermittent

Malfunctions

P.00-13

).

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-240

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

• Reconfirm whether the diagnosis code is output

from engine-ECU.

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 output?

YES :

Replace engine-ECU, and then go to Step

6.

NO :

Intermittent malfunction in the CAN busline
between the engine-ECU and
meter-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.

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 output?

YES :

Go to Step 1.

NO :

Check end.

Code No. U1110: A/C-ECU Time-out

CAUTION

Perform CAN bus-line diagnosis whenever the
diagnosis code U1110 is set in the engine-ECU.

CAUTION

Replace the ECU only after confirming that the
communication circuits are normal.

TROUBLE JUDGEMENT

Check Conditions

• Ignition switch is in "ON" position.

• Battery Voltage is more than 10 V.

• Cranking switch is in the OFF position or 3 sec-

onds after turning the cranking switch from ON to
OFF.

Judgement Criterion

• Signals from the meter-A/C-ECU via the CAN

bus-line cannot be received.

COMMENTS ON TROBLE SYMPTOMS

Current malfunction

• Most possible malfunctions are defects in CAN

bus-line harnesses and connectors between the
engine-ECU and meter-A/C-ECU, malfunction in
the meter-A/C-ECU power supply system, or mal-
function of the meter-A/C-ECU or engine-ECU.

Past malfunction

• Focus on diagnosing malfunction of the harness

and connector in CAN busline between
engine-ECU and A/C-ECU as well as malfunction
in the power supply system of A/C-ECU (Refer to
GROUP 00

− How to use Troubleshoot-

ing/Inspection Service Points

− How to Cope with

Intermittent Malfunctions

P.00-13

).

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

−

Troubleshooting

− CAN Bus Diagnosis Table

P.54D-13

).

PROBABLE CAUSES

• Failed harnesses and connectors

• Failed meter-A/C-ECU

• Failed engine-ECU

Main

Index

Group

TOC