Mitsubishi Grandis. Manual — part 357

COMBINATION METER

CHASSIS ELECTRICAL

54A-47

YES :

Diagnose the MPI system or the A/T system

(Refer to GROUP 13A, Troubleshooting

P.13A-20

or GROUP 23A, Troubleshooting

P.23A-17

).

NO :

Go to Step 3.

Step 3. MUT-III other system diagnosis code
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
ABS-ECU or TCL/ASC-ECU

• Code No.U1101: engine-A/T-ECU <A/T>

time-out (related to automatic transmission)

ETACS-ECU

• Code No.12: engine-A/T-ECU <A/T> time-out

(related to automatic transmission)

A/C-ECU

• Code No.U1101: engine-A/T-ECU <A/T>

time-out (related to automatic transmission)

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 check result satisfactory?

YES :

A poor connection, open circuit or other

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

−

How to Cope with Intermittent Malfunctions

P.00-5

).

NO :

Replace engine-A/T-ECU <A/T> 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) Turn the ignition switch to "ON" position.
(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-A/T-ECU
<A/T> and the combination meter (Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-5

).

NO :

Replace combination meter 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) Turn the ignition switch to "ON" position.
(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

Code No.U1102: ABS-ECU or TCL/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 TCL/ASC-ECU through CAN bus lines.

If it can not receive all the necessary signals from the
ABS-ECU or TCL/ASC-ECU, diagnosis code U1102
is set.

COMBINATION METER

CHASSIS ELECTRICAL

54A-48

COMMENTS ON TROUBLE SYMPTOM

Current trouble

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

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

Past trouble

• Carry out diagnosis with particular emphasis on

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

P.00-5

).

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

MUT-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/Inspection Service Points

−

How

to Cope with Intermittent Malfunctions

P.00-5

).

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 communication-linked ECUs
(Refer to GROUP 54D, Explanation about the
MUT-III CAN Bus Diagnostics

P.54D-9

).

CAUTION

If the ignition switch is turned to the ON position
without starting the engine, diagnosis code (past
trouble) U1100, U1101 may be set on the
combination meter after one minutes.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of ABS-ECU or TCL/ASC-ECU

• Malfunction of combination meter

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-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 Diagnostic Table

P.54D-16

). Repair the CAN bus line and go

to Step 6.

Step 2. MUT-III other system diagnosis code

Check that the ABS-ECU or TCL/ASC-ECU sets a
diagnosis code.

Q: Is the diagnosis code set?

YES :

Diagnose the ABS.Refer to GROUP 35B,

Troubleshooting

− Inspection Chart for

Diagnosis Code

P.35B-7

.

NO :

Go to Step 3.

Step 3. MUT-III other system diagnosis code

Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
MPI
U1102: ABS-ECU or TCL/ASC-ECU time-out

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 check result satisfactory?

YES :

A poor connection, open circuit or other

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

−

How to Cope with Intermittent Malfunctions

P.00-5

).

NO :

Replace ABS-ECU or TCL/ASC-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) Turn the ignition switch to "ON" position.
(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

COMBINATION METER

CHASSIS ELECTRICAL

54A-49

YES :

A poor connection, open circuit or other

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

−

How to Cope with Intermittent Malfunctions

P.00-5

).

NO :

Replace combination meter and 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) Turn the ignition switch to "ON" position.
(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

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

Current trouble

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

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

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness in the CAN bus
lines between the ETACS-ECU and the
combination 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 Service Points

P.00-5

).

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

MUT-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/Inspection Service Points

−

How

to Cope with Intermittent Malfunctions

P.00-5

).

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 communication-linked ECUs
(Refer to GROUP 54D, Explanation about the
MUT-III CAN Bus Diagnostics

P.54D-9

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of ETACS-ECU

• Malfunction of combination meter

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics
Use the MUT-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-16

). Repair the CAN bus line

and go to Step 4.

Step 2. MUT-III other system diagnosis code
Check that the ETACS-ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES :

Diagnose the SWS. (Refer to GROUP 54B,

Troubleshooting

P.54B-29

or GROUP 54C,

Troubleshooting

P.54C-30

.)

NO :

Go to Step 3.

Step 3. MUT-III diagnosis code
Check that diagnosis code U1206 is set.

Q: Is the check result satisfactory?

YES :

Replace ETACS-ECU and then go to step 4.

NO :

Replace combination meter and then go to
step 4.

COMBINATION METER

CHASSIS ELECTRICAL

54A-50

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 check result satisfactory?

YES :

The procedure is complete.

NO :

Go to Step 1.

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

Current trouble

• 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.

Past trouble

• 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
Service Points

P.00-5

).

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

MUT-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/Inspection Service Points - How
to Cope with Intermittent Malfunctions

P.00-5

).

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 communication-linked ECUs
(Refer to GROUP 54D, Explanation about the
MUT-III CAN Bus Diagnostics

P.54D-9

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of SRS-ECU

• Malfunction of combination meter

DIAGNOSTIC PROCEDURE

Step 1. MUT-III CAN bus diagnostics
Use the MUT-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-16

). Repair the CAN bus line

and go to Step 4.

Step 2. MUT-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

− Check Chart for

Diagnosis Code

P.52B-13

.

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) Turn the ignition switch to "ON" position.
(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.00-5

).

NO :

Replace SRS-ECU and then go to step 4.