Mitsubishi Colt Ralliart. Manual — part 473

COMBINATION METER

CHASSIS ELECTRICAL

54A-37

CAUTION

If the ignition switch is turned to the ON position
without starting the engine, the diagnosis code
may be set after one minutes. Now codes U1100,
U1101, U1102, U1106 and U1112 will be stored as
past troubles in the combination meter.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the electric power steering-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 lines (Refer to GROUP
54D, Diagnosis - Can Bus Diagnostics Table

P.54D-13

). Then go to Step 6.

STEP 2. M.U.T.-III other system diagnosis code
Check that an electric power steering-ECU is stored.

Q: Is the diagnosis code set?

YES :

Diagnose the electric power steering (Refer

to GROUP 37, Troubleshooting

P.37-9

).

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

• U1106: Electric power steering 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) 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 Electric power
steering-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 :

Replace the electric power steering-ECU,
and 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 Electric power
steering-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, and
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.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-38

Code No.U1109: ETACS-ECU Time-out

CAUTION

If diagnosis code U1109 is set in the combination
meter, diagnose the CAN main bus line.

CAUTION

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

TROUBLE JUDGMENT

The combination meter receives signal from the
ETACS-ECU via CAN bus lines. If it can not receive
all the necessary signals from the ETACS-ECU,
diagnosis code U1109 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 ETACS-ECU and the combina-
tion meter, the power supply system to the
ETACS-ECU, the ETACS-ECU itself, or the com-
bination 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 ETACS-ECU and the combina-
tion meter, and the power supply system to the
ETACS-ECU. For diagnosis procedures, refer to
"How to cope with past trouble" (Refer to GROUP
00, How to Use Troubleshooting/Inspection Serv-
ice 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

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of ETACS-ECU

• 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 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 4.

STEP 2. M.U.T.-III other system diagnosis code
Check that the ETACS-ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES :

Diagnose the CAN system (Refer to

GROUP 54D, Diagnosis -Can Bus
Diagnostics Table

P.54D-13

).

NO :

Go to Step 3.

STEP 3. M.U.T.-III diagnosis code
Check that diagnosis code U1206 is set.

Q: Is the check result satisfactory?

YES :

After the ETACS-ECU is replaced, then go

to Step 4.

NO :

After the combination meter is replaced,
then go to Step 4.

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 satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-39

Code No.U1112: SRS-ECU Time-out

CAUTION

If diagnosis code U1112 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
SRS-ECU through CAN bus lines. If it can not
receive all the necessary signals from the SRS-ECU,
diagnosis code U1112 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 SRS-ECU and the combination
meter, the power supply system to the SRS-ECU,
the SRS-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 SRS-ECU and the combination
meter, and the power supply system to the
SRS-ECU. For diagnosis procedures, refer to
"How to cope with past trouble" (Refer to GROUP
00, How to Use Troubleshooting/Inspection Serv-
ice 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

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of SRS-ECU

• 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 GROUP
54D, Diagnosis - Can Bus Diagnostics Table

P.54D-13

). Repair the CAN bus line and go

to Step 4.

STEP 2. M.U.T.-III other system diagnosis code
Check that the SRS-ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES :

Diagnose the SRS. Refer to GROUP 52B,

Troubleshooting

P.52B-11

.

NO :

Go to Step 3.

STEP 3. 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
lines between the SRS-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 :

Replace SRS-ECU and then go to step 4.

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 satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

Main

Index

Group

TOC

COMBINATION METER

CHASSIS ELECTRICAL

54A-40

Code No.U1120 Failure Information on Engine-ECU <M/T> or Engine-CVT-ECU <CVT> (Related to
Engine)

CAUTION

If diagnosis code U1120 is set in the combination
meter, diagnose the CAN main bus line.

TROUBLE JUDGMENT

The combination meter communicates with the
engine-ECU <M/T> or engine-CVT-ECU <CVT> via
CAN bus line. If failure information is sent to the
engine-ECU <M/T> or engine-CVT-ECU <CVT>,
diagnosis code U1120 will be set.

COMMENTS ON TROUBLE SYMPTOM

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

active.

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

<CVT>, or the combination meter may be defec-
tive.

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

stored.

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
engine-ECU <M/T> or engine-CVT-ECU <CVT>
and the combination meter. For diagnosis proce-
dures, refer to "How to cope with past trouble"
(Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points

P.00-13

).

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 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 if an engine-ECU <M/T> or engine-CVT-ECU
<CVT> 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.

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.U1120: Failure information on

engine-ECU <M/T> or engine-CVT-ECU <CVT>
(related to engine)

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) 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
lines between the engine-ECU <M/T> or
engine-CVT-ECU <CVT> and the
secondary speed sensor (Refer to GROUP
00, How to Use Troubleshooting/Inspection
Service Points

− How to Cope with

Intermittent Malfunctions

P.00-13

).

NO :

Replace engine-ECU <M/T> or
engine-CVT-ECU<CVT>, and then go to
Step 6 .

Main

Index

Group

TOC