Mitsubishi Colt Ralliart. Manual - part 378

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-20

Step 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

Step 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch "LOCK" (OFF) position to 

"ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ETACS-ECU.

Diagnosis code No.U1102: ABS-ECU or ASC-ECU time-out

CAUTION

• If diagnosis code No.U1102 is set in the 

ETACS-ECU, diagnose the CAN bus lines.

• Whenever the ECU is replaced, ensure that 

the input and output signal circuits are nor-
mal.

TROUBLE JUDGMENT

The ETACS-ECU receives ABS or ASC sys-
tem-related signals from the ABS-ECU or ASC-ECU. 
If meter-related signal can not be received at all, 
diagnosis code No.U1102 will be set.

COMMENT ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the ABS-ECU or ASC-ECU and 
the ETACS-ECU, the power supply system to the 
ABS-ECU or ASC-ECU, the ABS-ECU or 
ASC-ECU itself, or the ETACS-ECU may be 
defective.

Past trouble

• If diagnosis code No.U1102 are stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the ABS-ECU or ASC-ECU and 
the ETACS-ECU, and the power supply system to 
the ABS-ECU or ASC-ECU. For diagnosis proce-
dures, refer to "How to treat past trouble" (refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

− How to Treat Past Trouble 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions 

P.00-13

 and check the CAN 

bus lines. You can narrow down the possible 
cause of the trouble by referring to the diagnosis 
code, which is set regarding the CAN communi-
cation-linked ECUs (Refer to GROUP 54D 

−

 CAN 

Bus Line Diagnosis Flow 

P.54D-7

).

PROBABLE CAUSES

• Malfunction of the ABS-ECU

• Malfunction of the ASC-ECU

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-13

). On completion, 

go to Step 5.

Main

Index

Group

TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-21

Step 2. M.U.T.-III other system diagnosis code
Check if a ABS-ECU or ASC-ECU diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Diagnose the ABS or ASC (Refer to 

GROUP 35B 

− Troubleshooting 

P.35B-7

 

<ABS> or GROUP 35C 

− Troubleshooting 

P.35C-6

 <ASC>).

NO : 

Go to Step 3.

Step 3. M.U.T.-III other system diagnosis code
Check whether the combination meter sets ABS or 
ASC-related time-out diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

Step 4. Check whether the diagnosis code is 
reset
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ABS-ECU or ASC-ECU.

Step 5. Check whether the diagnosis code is 
reset
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ETACS-ECU.

Diagnosis code No.U1110: Meter and A/C-ECU time-out (related to A/C)

 

Diagnosis code No.U1108: Meter and A/C-ECU time-out (related to meter)

CAUTION

• If diagnosis code No.U1110 or No.U1108 are 

set in the ETACS-ECU, diagnose the CAN bus 
lines.

• Whenever the ECU is replaced, ensure that 

the input and output signal circuits are nor-
mal.

TROUBLE JUDGMENT

Diagnosis Code No.U1110

• The ETACS-ECU receives air conditioner system 

and meter-related signals from the combination 
meter (incorporating the meter and A/C-ECU). If 
air conditioner control system-related signal can 
not be received at all, diagnosis code No.U1110 
will be set.

Diagnosis Code No.U1108

• The ETACS-ECU receives air conditioner system 

and meter-related signals from the combination 
meter (incorporating the meter and A/C-ECU). If 
meter-related signal can not be received at all, 
diagnosis code No.U1108 will be set.

COMMENT ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the A/C-ECU and the 
ETACS-ECU, the power supply system to the 
combination meter, the combination meter itself, 
or the ETACS-ECU may be defective.

Past trouble

• If diagnosis code No.U1110 or No.U1108 are 

stored as a past trouble, carry out diagnosis with 
particular emphasis on wiring and connector(s) in 
the CAN bus line between the combination meter 
and the ETACS-ECU, and the power supply sys-
tem to the combination meter. For diagnosis pro-
cedures, refer to "How to treat past trouble" (refer 
to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points 

− How to Treat Past 

Trouble 

P.00-13

).

Main

Index

Group

TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-22

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions 

P.00-13

 and check the CAN 

bus lines. You can narrow down the possible 
cause of the trouble by referring to the diagnosis 
code, which is set regarding the CAN communi-
cation-linked ECUs (Refer to GROUP 54D 

−

 CAN 

Bus Line Diagnosis Flow 

P.54D-7

).

PROBABLE CAUSES

• Malfunction of the combination meter (incorporat-

ing the meter and A/C-ECU)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-13

). On completion, 

go to Step 5.

Step 2. M.U.T.-III other system diagnosis code
Check if a combination meter diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Troubleshooting 

P.54A-31

).

NO : 

Go to Step 3.

Step 3. M.U.T.-III other system diagnosis code
Check whether the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> sets meter and air-condi-
tioner-related time-out diagnosis code.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

Step 4. Check whether the diagnosis code is 
reset
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the combination meter 
(incorporating the meter and A/C-ECU).

Step 5. Check whether the diagnosis code is 
reset
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ETACS-ECU.

Main

Index

Group

TOC

DIAGNOSIS TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-23

Diagnosis code No.U1128: Meter and A/C-ECU failure information (related to meter)

CAUTION

• If diagnosis code No.U1128 is set in the 

ETACS-ECU, diagnose the CAN bus lines.

• Whenever the ECU is replaced, ensure that 

the input and output signal circuits are nor-
mal.

TROUBLE JUDGMENT

The ETACS-ECU receives combination 
meter-related signal from the combination meter via 
the CAN bus lines. If a fail-safe related data is con-
tained in the signal from the combination meter, diag-
nosis code No.U1128 will be stored.

COMMENT ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines, the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>, the combination meter 
or the ETACS-ECU may be defective.

Past trouble

• If diagnosis code No.U1128 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the combination meter and the 
ETACS-ECU, and the power supply system to the 
combination meter. For diagnosis procedures, 
refer to "How to treat past trouble" (refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

− How to Treat Past Trouble 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

−

 How to Cope with Intermit-

tent Malfunctions 

P.00-13

 and check the CAN 

bus lines. You can narrow down the possible 
cause of the trouble by referring to the diagnosis 
code, which is set regarding the CAN communi-
cation-linked ECUs (Refer to GROUP 54D 

−

 CAN 

Bus Line Diagnosis Flow 

P.54D-7

).

PROBABLE CAUSES

• Malfunction of the engine-ECU <M/T>

• Malfunction of the engine-CVT-ECU <CVT>

• Defective combination meter

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

Step 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-13

).

Step 2. M.U.T.-III other system diagnosis code
Check whether the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> sets a diagnosis code.

Q: Is the diagnosis code set?

YES : 

Diagnose the engine or the CVT (Refer to 

GROUP 13A 

− Troubleshooting 

P.13A-20

 

<4A9>, GROUP 13B 

− Troubleshooting 

P.13B-18

 <4G1>, or GROUP 23A 

− 

Troubleshooting 

P.23A-14

 <CVT>).

NO : 

Go to Step 3.

Step 3. M.U.T.-III other system diagnosis code
Check whether the combination meter-related diag-
nosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Troubleshooting 

P.54A-31

).

NO : 

Go to Step 4.

Step 4. Check whether the diagnosis code is 
reset
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "LOCK" (OFF) 

position to "ON" position.

(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the ETACS-ECU.

Main

Index

Group

TOC