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
A
B
C
D
E
F
DO NOT USED
CENTRE DISPLAY
CHASSIS ELECTRICAL
54A-144
TROUBLESHOOTING
TROUBLESHOOTING
M1543000701273
STANDARD FLOW OF DIAGNOSIS
TROUBLESHOOTING
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
DIAGNOSIS FUNCTION
M1543007000636
HOW TO READ DIAGNOSIS CODE
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
HOW TO ERASE DIAGNOSIS CODE
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
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
A
B
C
D
AT
Diagnosis
code No.
Diagnostic item
Reference page
U1073
Bus Off
U1100
Engine-ECU <M/T> or engine-A/T-ECU <A/T> time-out
(related to engine)
U1108
Combination meter time-out
U1109
ETACS-ECU time-out
U1110
A/C-ECU time-out
U1120
Failure information on engine-ECU <M/T> or engine-A/T-ECU
<A/T> (related to engine)
U1128
Failure information on combination meter
U1130
Failure information on A/C-ECU
U1600
MBUSY open
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
). 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
).
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
U1603
M-DATA short
U1604
M-SCK open
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
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
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
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
). 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
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?
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