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.