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
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
). 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
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
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.