Mitsubishi Colt Ralliart. Manual - part 472

COMBINATION METER

CHASSIS ELECTRICAL

54A-33

Code No.U1100: Engine-ECU <M/T> or Engine-CVT-ECU <CVT> Time-out (Related to Engine) 

 

Code No.U1101: Engine-CVT-ECU Time-out <CVT> (Related to Automatic Transmission)

CAUTION

If diagnosis code No.U1100 or U1101 is set in the 
meter, diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

U1100

• The combination meter receives engine control 

system-related signals from the engine-ECU 
<M/T> or engine-CVT-ECU <CVT> via CAN bus 
lines. If the display unit can not receives the nec-
essary signals, diagnosis code U1100 will be set.

U1101

• The combination meter receives transmission 

control system-related signal from the 
engine-CVT-ECU <CVT> via CAN bus lines. If 
the display unit can not receive the necessary 
signals, diagnosis code U1101 will be set.

COMMENTS ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

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

lines between the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> and the combination 
meter, the power supply system to the 
engine-ECU <M/T> or engine-CVT-ECU <CVT>, 
the engine-ECU <M/T> or engine-CVT-ECU 
<CVT> itself, or the combination meter may be 
defective.

The M.U.T.-III shows a diagnosis code status as 

stored.

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> and the combination 
meter, and the power supply system to the 
engine-ECU <M/T> or engine-CVT-ECU <CVT>. 
For diagnosis procedures, refer to "How to cope 
with past trouble" (Refer to GROUP 00, How to 
Use Troubleshooting/Inspection Service Points 

P.00-13

).

NOTE: For a past trouble, you may 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, Diag-
nosis - Can Bus Diagnostic Table 

P.54D-13

).

CAUTION

If the ignition switch is turned on without starting 
the engine and then one minutes passes, the 
combination meter may store U1100, U1101, 
U1102, U1106 and U1112 as past trouble.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of engine-ECU <M/T> or 

engine-CVT-ECU <CVT>

• Malfunction of combination meter

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 satisfactory?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus lines (Refer to 54D, 
Diagnosis - Can Bus Diagnostics Table 

P.54D-13

). Repair the CAN bus line and go 

to Step 6.

STEP 2. M.U.T.-III other system diagnosis code
Check whether the MPI system-related diagnosis 
code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the MPI system. Refer to GROUP 

13A <4A9>, Troubleshooting 

P.13A-20

, or 

GROUP 13B <4G1>, Troubleshooting 

P.13B-18

.

NO : 

Go to Step 3.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-34

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

EPS

• Code No.U1100: engine-ECU <M/T> or 

engine-CVT-ECU <CVT> time-out diagnosis 
code

ETACS

• Code No.U1101: engine-CVT-ECU <CVT> 

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 "ON" position.
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

A poor connection, open circuit or other 

intermittent malfunction is present in the 
CAN bus lines between the engine-ECU 
<M/T> or engine-CVT-ECU <CVT> and the 
combination meter (Refer to GROUP 00, 
How to Use Troubleshooting/Inspection 
Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

)

NO : 

After the engine-ECU <M/T> or 
engine-CVT-ECU <CVT> is replaced. Then 
go to step 6.

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) 

→ ON

(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES : 

A poor connection, open circuit or other 

intermittent malfunction is present in the 
CAN bus lines between the engine-ECU 
<M/T> or engine-CVT-ECU <CVT> and the 
combination meter (Refer to GROUP 00, 
How to Use Troubleshooting/Inspection 
Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

)

NO : 

After the combination meter is replaced. 
Then go to step 6.

STEP 6. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) 

→ ON

(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-35

Code No.U1102: ABS-ECU or ASC-ECU Time-out

CAUTION

If diagnosis code U1102 is set in the combination 
meter, always diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal

TROUBLE JUDGMENT

The combination meter communicates with the 
ABS-ECU or ASC-ECU through CAN bus lines. If it 
can not receive all the necessary signals from the 
ABS-ECU or ASC-ECU, diagnosis code U1102 is 
set.

COMMENTS ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

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

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

The M.U.T.-III shows a diagnosis code status as 

stored.

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the ABS-ECU or ASC-ECU and 
the combination meter, and the power supply 
system to the ABS-ECU or ASC-ECU. For diag-
nosis procedures, refer to "How to treat past trou-
ble" (Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

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 Intermittent 
Malfunction 

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 communica-
tion-linked ECUs (Refer to GROUP 54D, Diagno-
sis - Can Bus Diagnostics Table 

P.54D-13

).

CAUTION

If the ignition switch is turned on without starting 
the engine and then one minutes passes, the 
combination meter may store U1100, U1101, 
U1102, U1106 and U1112 as past trouble.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ABS-ECU or ASC-ECU

• Malfunction of the combination meter

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 - Can Bus Diagnostics Table 

P.54D-13

). Repair the CAN bus line and go 

to Step 6.

STEP 2. M.U.T.-III other system diagnosis code
Check that the ABS-ECU or ASC-ECU sets a diag-
nosis code.

Q: Is the diagnosis code set?

YES : 

Diagnose the ABS or ASC-ECU system ( 

Refer to GROUP 35B, Troubleshooting 

P.35B-7

<ABS> or Refer to GROUP 35C, 

Troubleshooting 

P.35C-6

<ASC>).

NO : 

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

Engine

• U1102: ABS or ASC time-out diagnosis code

EPS

• U1102: ABS or ASC time-out diagnosis code

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-36

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) 

→ ON

(3) Check if the diagnosis code is set.

Q: Is the check result normal?

YES : 

A poor connection, open circuit or other 

intermittent malfunction is present in the 
CAN bus lines between the ABS-ECU or 
ASC-ECU and the combination meter 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

)

NO : 

After the ABS-ECU or ASC-ECU is 
replaced, then go to Step 6.

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) 

→ ON

(3) Check if the diagnosis code is set.

Q: Is the check result normal?

YES : 

A poor connection, open circuit or other 

intermittent malfunction is present in the 
CAN bus lines between the ABS-ECU or 
ASC-ECU and the combination meter 
(Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

After the combination meter is replaced, 
then go to Step 6.

STEP 6. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) 

→ ON

(3) Check if the diagnosis code is set.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

Code No.U1106 EPS-ECU Time-out

CAUTION

If diagnosis code No.U1106 is set in the 
meter-ECU, diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

The combination meter receives signals from the 
electric power steering-ECU through the CAN bus 
lines. If it cannot receive any signals from the electric 
power steering-ECU, diagnosis code U1106 will be 
set.

COMMENTS ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

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

lines between the electric power steering-ECU 
and the combination meter, the power supply 
system to the electric power steering-ECU, the 
combination meter itself may be defective.

The M.U.T.-III shows a diagnosis code status as 

stored.

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the electric power steering-ECU 
and the combination meter, and the power supply 
system to the electric power steering-ECU. For 
diagnosis procedures, refer to "How to cope with 
past trouble" (Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-13

).

NOTE: For a past trouble, you may 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, 
Explanation about the M.U.T.-III CAN Bus Diag-
nostics 

P.54D-7

).

Main

Index

Group

TOC