Mitsubishi L200. Manual — part 293
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-79
STEP 5. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Replace A/T-ECU. Then go to Step 6.
NO :
Intermittent malfunction in CAN busline
between ETACS-ECU and A/T-ECU (Refer
to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points ).
STEP 6. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Go to step 1.
NO :
The procedure is complete.
Code No.U1120: Failure information of engine-ECU
DIAGNOSIS CODE SET CONDITIONS
A/T-ECU receives the signal from the engine-ECU
via the CAN bus line. When the received signal con-
tains failure information, the diagnosis code No.
U1120 is stored.
PROBABLE CAUSES
• Damaged wiring harness or connector
• Malfunction of the engine-ECU
• Malfunction of the A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Using M.U.T.-III, perform CAN busline diagnosis.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN busline (Refer to
GROUP54C, Diagnosis
− Can Bus
Diagnostic Chart ), and then go to Step 5.
STEP 2. M.U.T.-III other system diagnosis codes
Check whether the diesel fuel system diagnosis
codes are set or not.
Q: Is the diagnosis code set?
YES :
Diagnose the diesel fuel system (Refer to
GROUP 13A, Troubleshooting ).
NO :
Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Replace engine-ECU. Then go to Step 4.
NO :
Intermittent malfunction in CAN busline
between engine-ECU and A/T-ECU (Refer
to GROUP 00
− How to Use
Troubleshooting/Inspection Service Points ).
STEP 4. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Replace A/T-ECU. Then go to Step 5.
NO :
The procedure is complete.
STEP 5. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
• Erase the diagnosis codes being output.
• Ignition switch: LOCK (OFF) to ON
• Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Go to Step 1.
NO :
The procedure is complete.
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-80
Code No.U1190: Can’t receive fault detection control signal
DIAGNOSIS CODE SET CONDITIONS
To each ECU connected to the CAN bus line,
ETACS-ECU sends the diagnosis code (U code)
detection permission or prohibition signal. When A/T-
ECU cannot receive the diagnosis code (U code)
detection permission or prohibition signal for 5 sec-
onds, diagnosis code No. U1190 is stored.
PROBABLE CAUSES
• Malfunction of the ETACS-ECU
• Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Using M.U.T.-III, perform CAN busline diagnosis.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN busline (Refer to
GROUP54C, Diagnosis
− Can Bus
Diagnostic Chart ), and then go to Step 3.
STEP 2. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Replace the ETACS-ECU, and then go to
Step 3.
NO :
The procedure is complete.
STEP 3. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis codes are output
from A/T-ECU.
(1) Erase the diagnosis codes being output.
(2) Ignition switch: LOCK (OFF) to ON
(3) Confirm whether the diagnosis codes are output.
Q: Is the diagnosis code output?
YES :
Return to Step 1.
NO :
The procedure is complete.
TROUBLE SYMPTOMS CHART
M1231128400177
Trouble symptom
Inspection
procedure No.
Reference page
Communication with the M.U.T.-III is not possible
1
Driving not possible
Engine does not start
2
Does not move forward
3
Does not move backward
4
Does not move (forward or backward)
5
Malfunction when
starting off
Engine stalls during shifting
6
Shift shock when shifting from N to D and
long delay
7
Shift shock when shifting from N to R and
long delay
8
Shift shock when shifting from N to D, N to
R and long delay
9
Problem during
shifting
Shift shock and slipping
10
Incorrect shift points Does not shift properly (all point)
11
Does not shift properly (some point)
12
No shifting
Does not shift (no diagnosis code)
13
Problem during
driving
Poor acceleration
14
Vibration
15
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-81
SYMPTOM PROCEDURES
Inspection Procedure 1: Communication with the M.U.T.-III is not Possible.
AC509577
A/T-ECU
DIAGNOSIS
CONNECTOR
Wire colour code
B : Black LG : Light green G : Green L : Blue
W : White Y : Yellow SB : Sky blue BR : Brown
O : Orange GR : Grey R : Red P : Pink
V : Violet PU : Purple
AD
Diagnosis Connector Circuit
Overdrive switch system <4A/T>
16
4LLc switch system <4WD>
17
Shift switch assembly system<5A/T>
18
Trouble symptom
Inspection
procedure No.
Reference page
AC509613
Connector: C-01 <LHD>
AK
AC509930AM
Connector: C-01 <RHD>
AC510057
Harness side
A/T-ECU
C-20
AC
Connector: C-20
A/T-ECU
<RHD>
<LHD>
AC509611AJ
Connector: C-22 <LHD>
C-22 (B)
Harness side
(Front side)
AC509932AJ
Connector: C-22 <RHD>
C-22 (B)
Harness side
(Front side)
AC509613
Connector: C-119 <LHD>
AN
C-119 (GR)
AC509932AU
Connector: C-119 <RHD>
C-119 (GR)
TROUBLESHOOTING
AUTOMATIC TRANSMISSION
23A-82
CAUTION
If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Diagnose
the CAN bus lines before the diagnosis codes
(Refer to GROUP 54C, CAN bus-line diagnostic
flow ).
TECHNICAL DESCRIPTION (COMMENT)
If the M.U.T.-III can not communicate with the A/T
system, the CAN bus lines may be defective. If the A/
T system does not work, the A/T-ECU or its power
supply circuit may be defective.
PROBABLE CAUSES
• Damaged wiring harness or connector
• Malfunction of the A/T-ECU
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