Mitsubishi L200. Manual - part 156
TROUBLESHOOTING
DIESEL FUEL
13A-420
STEP 3. M.U.T.-III diagnosis code
• Reconfirm whether the diagnosis codes are out-
put from engine-ECU.
1. Erase the diagnosis codes being output.
2. Ignition switch: "LOCK" (OFF) to ON
3. Confirm whether the diagnosis codes are output.
Q: Are the diagnosis codes output?
YES :
Go to Step 1 .
NO :
The check is end.
Code No. U1101: A/T-ECU Time-out <A/T>
CAUTION
If Diagnosis Code U1101 is output from engine-
ECU surely perform CAN busline diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
NOTE: When the diagnosis codes relating to the
CAN communication error are output, make sure of
the vehicle equipment. When the vehicle is not
equipped with the system the engine-ECU communi-
cates to, the diagnosis code is always output. This is
not abnormal.
TROUBLE JUDGMENT
Check Conditions
• The diagnosis code setting enabled signal is
received from ETACS-ECU.
Judgment Criterion
• The signals cannot be received from A/T-ECU for
0.5 second or more.
COMMENT ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN busline
between engine-ECU and A/T-ECU, by malfunc-
tion in the power supply system of A/T-ECU, in
combination meter itself, in engine-ECU.
Past malfunction
• Focus on diagnosing malfunction of the harness
and connector in CAN busline between engine-
ECU and A/T-ECU as well as malfunction in the
power supply system of A/T-ECU. Refer to past
trouble (Refer to GROUP 00
− How to Use Trou-
bleshooting/Inspection Service Points
− How to
Treat Past Trouble ) for the diagnosis procedure.
NOTE: In case of Past trouble, M.U.T.-III CAN bus
diagnosis cannot detect the failure even if there is
malfunction in CAN bus, so that check CAN
busline in the same way as Intermittent malfunc-
tion (Refer to GROUP 00
−
How to Use Trouble-
shooting/Inspection Service Points
−
How to
Cope with Intermittent Malfunctions ). The diag-
nosis codes being output to each ECU with CAN
communication can narrow down the most sus-
pected area (Refer to GROUP 54C
−
Trouble-
shooting
−
Can Bus Diagnostics Table ).
PROBABLE CAUSES
• Failed of the harness and the connector
• Failed A/T-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Using M.U.T.-III, perform CAN busline diagnosis.
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Correct CAN busline (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ), and then go to Step 6 .
STEP 2. M.U.T.-III other system diagnosis codes.
• Confirm whether the diagnosis codes are output
from A/T-ECU.
Q: Is the diagnosis code output?
YES :
Perform the troubleshooting of A/T-ECU
(Refer to GROUP 23A
− Check Chart for
Diagnosis Code ).
NO :
Go to Step 3 .