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Mitsubishi Grandis. Manual - part 381

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-143

Tool

Number

Name

Application

MB990784

Ornament
remover

Removal of selector lever panel,
instrument centre panel

MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

MUT-III
sub-assembly

A: (V.C.I.)

Vehicle
communicatio
n interface

B: MUT-III USB

cable

C: MUT-III Main

harness A
(Vehicles with
CAN
communicatio
n system)

D: MUT-III Main

harness B
(Vehicles
without CAN
communicatio
n system)

E: MUT-III

Measurement
adapter

F: MUT-III

Trigger
harness

Centre display check (diagnosis
code)

CAUTION

For vehicles with CAN
communication, use MUT-III main
harness A to send simulated
vehicle speed. If you connect
MUT-III main harness B instead,
the CAN communication does
not function correctly.

MB990784

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

DO NOT USED

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-144

TROUBLESHOOTING

M1543000701273

STANDARD FLOW OF DIAGNOSIS
TROUBLESHOOTING

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

DIAGNOSIS FUNCTION

M1543007000636

HOW TO READ DIAGNOSIS CODE

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

HOW TO ERASE DIAGNOSIS CODE

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-5

DIAGNOSIS CODE CHART

M1546500800022

CAUTION

During diagnosis, a diagnosis code associated
with other system may be set when the ignition
switch is turned on with connector(s)
disconnected. On completion, confirm all
systems for diagnosis code(s). If diagnosis
code(s) are set, erase them all.

MB991223

A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set

A: Test harness
B: LED harness
C: LED harness

adapter

D: Probe

Making voltage and resistance
measurements during
troubleshooting

A: Connect pin contact pressure

inspection

B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection

Tool

Number

Name

Application

MB991223

Diagnosis
code No.

Diagnostic item

Reference page

U1073

Bus Off

P.54A-145

U1100

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

P.54A-146

U1108

Combination meter time-out

P.54A-147

U1109

ETACS-ECU time-out

P.54A-148

U1110

A/C-ECU time-out

P.54A-149

U1120

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

P.54A-151

U1128

Failure information on combination meter

P.54A-152

U1130

Failure information on A/C-ECU

P.54A-153

U1600

MBUSY open

P.54A-154

U1601

MBUSY short

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-145

DIAGNOSIS CODE INSPECTION
PROCEDURES

Code No.U1073 Bus Off

CAUTION

If diagnosis code U1073 is set in the centre
display, always diagnose the CAN bus lines.

CAUTION

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

TROUBLE JUDGMENT

If the centre display ceases communicating once (i.e.
bus off) and then returns to it, the centre display will
not communicate for three minutes immediately after
that point. This three-minute period is called "Penalty
mode." Immediately after the centre display returns
to communication, the diagnosis code is set.

COMMENTS ON TROUBLE SYMPTOM

The CAN bus line wiring harness, connector(s), or
the centre display unit may be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• 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 3.

Step 2. 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 :

If the trouble is solved, it is determined that

there is an intermittent malfunction such as
poor engaged connector(s) or open circuit
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-5

NO :

Replace centre display and then 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 :

The procedure is complete.

NO :

Go to Step 1.

U1602

M-DATA open

P.54A-155

U1603

M-DATA short

U1604

M-SCK open

P.54A-156

U1605

M-SCK short

Diagnosis
code No.

Diagnostic item

Reference page

CENTRE DISPLAY

CHASSIS ELECTRICAL

54A-146

Code No.U1100 engine-ECU <M/T> or engine-A/T-ECU <A/T> time-out (related to engine)

CAUTION

If diagnosis code U1100 is set in the centre
display, always diagnose the CAN bus lines.

CAUTION

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

TROUBLE JUDGMENT

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

COMMENTS ON TROUBLE SYMPTOM

Current trouble

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

lines between the engine-ECU <M/T> or
engine-A/T-ECU <A/T> and the centre display
unit, the power supply system to the display unit,
the display unit itself, or the engine-ECU <M/T>
or engine-A/T-ECU <A/T> may be defective.

Past trouble

• 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-A/T-ECU <A/T> and the centre display
unit, and the power supply system to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>.
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 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 if an MPI system diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the MPI system (Refer to GROUP

13A, Troubleshooting

P.13A-20

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.
ASC-ECU

• Code No.U1100: engine-ECU <M/T> or

engine-A/T-ECU <A/T> time-out (related to
Engine)

ETACS-ECU

• Code No.U1100: engine-ECU <M/T> or

engine-A/T-ECU <A/T> time-out (related to
Engine)

A/C-ECU

• Code No.U1100: engine-ECU <M/T> or

engine-A/T-ECU <A/T> time-out (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) Turn the ignition switch to "ON" position.
(3) Check if the diagnosis code is set.

Q: Is the check result satisfactory?

Content .. 379 380 381 382 ..