Mitsubishi Grandis. Manual — part 947
TROUBLESHOOTING
TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM
35C-113
CAUTION
If diagnosis code No.U1104 is set in the
TCL/ASC-ECU, always diagnose the CAN bus
lines.
CAUTION
Whenever the ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
The TCL/ASC-ECU and the steering wheel sensor
are connected each other via a CAN bus line, and
the sensor sends the steering wheel angle
information to the ECU.
DIAGNOSIS CODE SET CONDITIONS
Current trouble
• Connector(s) or wiring harness in the CAN bus
lines between the TCL/ASC-ECU and the
steering wheel sensor, the power supply system
to the steering wheel sensor, the steering wheel
sensor itself, or the TCL/ASC-ECU may be
defective.
Past trouble
• Carry out diagnosis with particular emphasis on
connector(s) or wiring harness in the CAN bus
lines between the steering wheel sensor and the
TCL/ASC-ECU, and the power supply system to
the steering wheel sensor. 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 Malfunction
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, CAN bus line Diagnostic
flow
).
PROBABLE CAUSES
• The CAN bus line is defective.
• Malfunction of the hydraulic unit (integrated with
TCL/ASC-ECU)
• Malfunction of the steering wheel sensor
DIAGNOSIS
STEP 1. MUT-III CAN bus diagnostics
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector
as shown in the illustration.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to GROUP
54D, CAN bus line Diagnostic flow
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Disconnect MUT-III.
Q: Is the check result normal?
YES :
Go to Step 2
NO :
Repair the CAN bus lines (Refer to GROUP
54D, CAN bus line Diagnostic flow
). On completion, go to Step 6.
STEP 2. MUT-III steering wheel sensor diagnosis
code
Check if a steering wheel sensor diagnosis code is
set.
Q: Is the diagnosis code set?
YES :
Diagnose the steering wheel sensor by
referring to
.
NO :
Go to Step 3.
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
TROUBLESHOOTING
TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM
35C-114
STEP 3. MUT-III other system diagnosis code
Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
Engine-A/T-ECU <A/T> or Engine-ECU <M/T>
• Code No.U1100: TCL/ASC-ECU time-out
Combination meter
• Code No.011: 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 any diagnosis code set?
YES :
A poor connection, open circuit or other
intermittent malfunction is present in the
CAN bus lines between the steering wheel
sensor and the TCL/ASC-ECU (Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
).
NO :
Replace hydraulic unit (integrated with
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 any diagnosis code set?
YES :
A poor connection, open circuit or other
intermittent malfunction is present in the
CAN bus lines between the steering wheel
sensor and the TCL/ASC-ECU (Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
).
NO :
Replace steering wheel sensor 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 any diagnosis code set?
YES :
The procedure is complete.
NO :
Go to Step 1.
Code No.U1120 CAN communications system TCL uncontrollable by engine malfunction
CAUTION
• If diagnosis code No.U1120 is set in the
TCL/ASC-ECU, always diagnose the CAN
main bus line. If there is any fault in the CAN
bus lines, an incorrect diagnosis code may be
set.
• Whenever the ECU is replaced, ensure that
the communication circuit is normal.
DIAGNOSIS CODE SET CONDITION
The TCL/ASC-ECU receives engine system-related
signals from the Engine-ECU <M/T> or
Engine-A/T-ECU <A/T> via CAN bus lines. If a
fail-safe related data is contained in the signal from
the Engine-ECU <M/T> or Engine-A/T-ECU <A/T>,
diagnosis code No.U1120 will be stored.
PROBABLE CAUSES
• Damaged harness or connector.
• Malfunction of the Engine-ECU <M/T> or
Engine-A/T-ECU <A/T>.
• Malfunction of the TCL/ASC-ECU.
TROUBLESHOOTING
TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM
35C-115
DIAGNOSIS
STEP 1. MUT-III other system diagnosis code
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector
as shown in the illustration.
(2) Turn the ignition switch to the "ON" position.
(3) Check for MPI system diagnosis code (Refer to
GROUP 13A, MPI Diagnosis - Diagnosis
Function
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Disconnect MUT-III.
Q: Is any diagnosis code set?
YES :
Repair the MPI control system. (Refer to
GROUP 13A, MPI Diagnosis - Diagnosis
Function
). Then go to Step 6 .
NO :
Go to Step 2 .
STEP 2. MUT-III CAN bus diagnostics
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector
as shown in the illustration.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to GROUP
54D, CAN bus line Diagnostic flow
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Disconnect MUT-III.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair the CAN bus line (Refer to GROUP
54D, CAN bus line Diagnostic flow
). Then go to Step 6.
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
TROUBLESHOOTING
TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM
35C-116
STEP 3. MUT-III other system diagnosis code
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector
as shown in the illustration.
(2) Turn the ignition switch to the "ON" position.
(3) Check if a diagnosis code, which relates to CAN
communication-linked systems below, is set.
A/C-ECU
• Code No.U1120: Engine-related CAN
communication failure information
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Disconnect MUT-III.
Q: Is code No.U1120 set?
YES :
Go to Step 4 .
NO :
Go to Step 5 .
STEP 4. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
CAUTION
To prevent damage to MUT-III, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector
as shown in the illustration.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the diagnosis code (Refer to
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
(5) Turn the ignition switch to the "ON" position.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
(8) Disconnect MUT-III.
Q: Is code No.U1120 set?
YES :
Replace the Engine-ECU <M/T> or
Engine-A/T-ECU <A/T> (Refer to GROUP
13A, Engine-ECU and Engine-A/T-ECU
NO :
It can be assumed that this malfunction is
intermittent. Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent
Malfunction
.
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
AC302297
AC310120
AB
MB991827
16-pin
MB991910
MB991824
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