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