Mitsubishi Grandis. Manual — part 383

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-151

YES :

The procedure is complete.

NO :

Go to Step 1.

Code No.U1120 Failures Information on engine-ECU <M/T> or engine-A/T-ECU <A/T> (Related to
Engine)

CAUTION

If diagnosis code U1120 is set in the centre
display, always diagnose the CAN bus lines.

TROUBLE JUDGMENT

The centre display receives the vehicle speed signal
for the display from the combination meter via CAN
bus lines. If failure information is sent to the vehicle
speed signal for the display, diagnosis code U1120
will be set.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• The combination meter or the centre display may

be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
centre display and the combination meter. For
diagnosis procedures, refer to "How to treat past
trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of engine-ECU <M/T> or

engine-A/T-ECU <A/T>

• Malfunction of centre display unit

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 6.

Step 2. MUT-III other system diagnosis code
Check whether the combination meter-related
diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the combination meter. (Refer to

P.54A-35

.)

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.
Combination meter

• Code No.U1120: Failure information on

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

A/C-ECU

• Code No.U1120: Failure information on

engine-ECU <M/T> or engine-A/T-ECU <A/T>
(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.
Replace the centre display temporarily, and then
check that the diagnosis code is not reset.
(1) Replace the centre display temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to "ON" position.
(4) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

Replace centre display and then go to step

6.

NO :

Go to Step 5.

Step 5. Check whether the diagnosis code is
reset.
Replace the combination meter temporarily, and then
check that the diagnosis code is not reset.
(1) Replace the combination meter temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to "ON" position.
(4) Check if the diagnosis code is set.

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-152

Q: Is the check result satisfactory?

YES :

Replace combination meter and then go to

step 6.

NO :

A poor connection, open circuit or other
intermittent malfunction is present in the
lines between the centre display and the
combination meter (Refer to GROUP 00,
How to Use Troubleshooting/Inspection
Service Points

− How to Cope with

Intermittent Malfunctions

P.00-5

).

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.U1128 Failures Information on Combination Meter

CAUTION

If diagnosis code U1128 is set in the centre
display, always diagnose the CAN bus lines.

TROUBLE JUDGMENT

The centre display unit communicates with the
combination meter via CAN bus lines. If failure
information is sent to the combination meter,
diagnosis code U1128 will be set.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• The combination meter or the centre display unit

may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
combination meter and the centre display unit.
For diagnosis procedures, refer to "How to treat
past trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of combination meter

• Malfunction of centre display unit

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 combination meter sets a diagnosis
code.

Q: Is the diagnosis code set?

YES :

Diagnose the combination meter. Refer to

P.54A-35

.

NO :

Go to Step 3.

Step 3. Check the combination meter operation.

Check that the fuel gauge in the combination meter
works normally.

Q: Is the check result satisfactory?

YES :

Go to Step 4.

NO :

Diagnose the combination meter. Refer to

P.54A-53

.

Step 4. Check whether the diagnosis code is
reset.

Replace the centre display temporarily, and then
check that the diagnosis code is not reset.
(1) Replace the centre display temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition Switch to "ON" position.
(4) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

Replace centre display unit and then go to

step 6.

NO :

Go to Step 5.

Step 5. Check whether the diagnosis code is
reset.

Replace the combination meter temporarily, and then
check that the diagnosis code is not reset.
(1) Replace the combination meter temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition Switch to "ON" position.
(4) Check if the diagnosis code is set.

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-153

Q: Is the check result satisfactory?

YES :

A poor connection, open circuit or other

intermittent malfunction is present in the
lines between the combination meter and
the centre display unit (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.U1130 Failures Information on A/C-ECU

CAUTION

If diagnosis code U1130 is set in the centre
display, always diagnose the CAN bus lines.

TROUBLE JUDGMENT

The centre display unit communicates with the
A/C-ECU via CAN bus lines. If the A/C-ECU sends
failure information, diagnosis code U1130 will be set.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• The A/C-ECU or the centre display unit may be

defective.

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
A/C-ECU and the centre display unit. For
diagnosis procedures, refer to "How to treat past
trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

).

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of A/C-ECU

• Malfunction of centre display unit

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 5.

Step 2. MUT-III other system diagnosis code

Check if an A/C-ECU diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the A/C system (Refer to GROUP

55, Troubleshooting

P.55-8

).

NO :

Go to Step 3.

Step 3. Check whether the diagnosis code is
reset.

Replace the centre display temporarily, and then
check that the diagnosis code is not reset.
(1) Replace the centre display temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition Switch to "ON" position.
(4) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

Replace centre display unit and then go to

step 5.

NO :

Go to Step 4.

Step 4. Check whether the diagnosis code is
reset.

Replace the A/C-ECU temporarily, and then check
that the diagnosis code is not reset.
(1) Replace the A/C-ECU temporarily.
(2) Erase the diagnosis code.
(3) Turn the ignition Switch to "ON" position.
(4) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

YES :

Replace A/C-ECU and then go to step 5.

NO :

A poor connection, open circuit or other
intermittent malfunction is present in the
lines between the A/C-ECU and the centre
display unit (Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service
Points

− How to Cope with Intermittent

Malfunctions

P.00-5

).

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-154

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 :

The procedure is complete.

NO :

Go to Step 1.

Code No.U1600, U1601 M-BUSY open, short

COMMENTS ON TROUBLE SYMPTOM

The radio and CD player operation screen will be
frozen if the centre display have received abnormal
data from the radio and CD player and via M-bus
communication.

POSSIBLE CAUSES

• Malfunction of centre display unit

• Malfunction of radio and CD player

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: Radio and CD player
connector C-22 and centre display unit
connector C-07.

Q: Is radio and CD player connector C-22 and centre

display unit connector C-07 in good condition?

YES :

Go to Step 2.

NO :

Repair the defective connector.

Step 2. Check the wiring harness between radio
and CD player connector C-22 (terminal 27) and
centre display unit connector C-07 (terminal 17).

Q: Is the wiring harness between radio and CD player

connector C-22 (terminal 27) and centre display
unit connector C-07 (terminal 17) in good
condition?

YES :

Go to Step 3.

NO :

Repair the wiring harness.

Step 3. Retest the system.

Confirm that the radio and CD player operation
screen is displayed normally.

Q: Is the check result satisfactory?

AUDIO

CENTER
DISPLAY

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

M-BUS Line Circuit