Mitsubishi Lancer (4A9 engine). Manual - part 111
HEADLAMP
CHASSIS ELECTRICAL
54A-106
Code No. U0141 ETACS CAN Time-out
CAUTION
• If the diagnosis code No. U0141 is set, be sure
to diagnose the CAN bus line.
• Before replacing the ECU, ensure that the
power supply circuit, the earth circuit and the
communication circuit are normal.
DIAGNOSTIC FUNCTION
The headlamp automatic levelling-ECU sets diagno-
sis code No.U0141 when it cannot receive signals
from the ETACS-ECU.
JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU cannot
receive the signal from the ETACS-ECU via the CAN
bus line.
PROBABLE CAUSES
• Malfunction of CAN bus line
• Malfunction of ETACS-ECU
• Malfunction of headlamp automatic levelling-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the
ETACS-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot the ETACS-ECU. (Refer to
GROUP 54A
− ETACS-ECU −
Troubleshooting .)
NO :
Go to Step 3.
STEP 3. Check the M.U.T.-III Diagnosis code for
other systems
Check if the diagnosis code No. U0141 is set to
engine-ECU.
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the head-
lamp automatic levelling-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
A poor connection, open circuit, or other
intermittent malfunction in the CAN bus line
between the headlamp automatic levelling-
ECU and the ETACS-ECU. (Refer to
GROUP 00
− How to Use Troubleshooting/
Inspection Service Points - How to Cope
with Intermittent Malfunction .)
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set to the head-
lamp automatic levelling-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Check if the diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the headlamp automatic levelling-
ECU.
NO :
A poor connection, open circuit, or other
intermittent malfunction in the CAN bus line
between the headlamp automatic levelling-
ECU and the ETACS-ECU. (Refer to
GROUP 00
− How to Use Troubleshooting/
Inspection Service Points - How to Cope
with Intermittent Malfunction .)