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 .)

HEADLAMP

CHASSIS ELECTRICAL

54A-107

Code No. U1415 Coding not completed/failed

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnosis code may be set. Prior
to this diagnosis, always diagnose the CAN
bus lines.

• Before replacing the ECU, ensure that the

power supply circuit, the earth circuit and the
communication circuit are normal.

DIAGNOSTIC FUNCTION
When the variant coding for ETACS-ECU has not
been implemented, AFS or headlamp automatic lev-
elling system warnings are displayed on the multi
information display and code No. U1415 is stored.

JUDGEMENT CRITERIA
The ETACS-ECU variant coding is not completed.

PROBABLE CAUSES

• Variant coding for ETACS-ECU has not been

implemented.

• Malfunction of the ETACS-ECU

• Malfunction of the 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 if the diagnosis code relating to the coding
error is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES :

Troubleshoot the ETACS (Refer to ).

NO :

Go to Step 3.

STEP 3. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set to headlamp
automatic levelling-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF)

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Replace the headlamp automatic levelling-

ECU.

NO :

The trouble can be an intermittent
malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

Code No. U1417 Abnormality in coding data

CAUTION

• If there is any problem in the CAN bus lines,

an incorrect diagnosis code may be set. Prior
to this diagnosis, always diagnose the CAN
bus lines.

• Before replacing the ECU, ensure that the

power supply circuit, the earth circuit and the
communication circuit are normal.

DIAGNOSTIC FUNCTION
Headlamp automatic levelling-ECU communicates
with ETACS-ECU via CAN bus lines. When the vehi-
cle information received from ETACS-ECU is invalid,
AFS or headlamp automatic levelling system warn-
ings are displayed on the multi information display
and code No. U1417 is stored.

JUDGEMENT CRITERIA
The vehicle information received from ETACS-ECU
at coding is not valid.

PROBABLE CAUSES

• Coding information input mistake

• ETACS-ECU failure or improper assembly

• Malfunction of the 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?

HEADLAMP

CHASSIS ELECTRICAL

54A-108

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 if the diagnosis code relating to the coding
error is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES :

Troubleshoot the ETACS (Refer to ).

NO :

Go to Step 3.

STEP 3. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set to headlamp
automatic levelling-ECU.
(1) Erase the diagnosis code.

(2) Turn the ignition switch from "LOCK" (OFF)

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Replace the headlamp automatic levelling-

ECU.

NO :

The trouble can be an intermittent
malfunction (Refer to GROUP 00

− How to

use Troubleshooting/inspection Service
Points

− How to Cope with Intermittent

Malfunction ).

TROUBLE SYMPTOM CHART

M1540102101082

Trouble symptom

Inspection
Procedure No.

Reference
page

Headlamp and tail lamp

None of the low-beam headlamps
illuminate.

1

None of the high-beam headlamps
illuminate.

2

The headlamps (low-beam) illuminate
regardless of the lighting switch positions.
(High-beam does not illuminate)

3

The headlamps do not illuminate when the
passing switch is turned ON.

4

One of the headlamp(s) does not
illuminate.

5

The high-beam indicator lamp does not
illuminate.

6

The headlamp automatic shutdown
function does not work normally.

7

The auto lamp function does not work
normally.

8

One of the position lamps, the licence plate
lamps or the tail lamps does not illuminate.

9

Turn-signal lamp

None of the turn-signal lamps illuminate.

10

The comfort flashing function does not
work normally.

11

The turn-signal indicator lamps do not
illuminate.

12

AFS

One of the bending lamps does not
illuminate.

13

The bending lamp illumination timing by
the steering operation is failed.

14

The welcome light function does not work normally.

15

The coming home light function does not work normally.

16

HEADLAMP

CHASSIS ELECTRICAL

54A-109

SYMPTOM PROCEDURES

Inspection Procedure 1: None of the low-beam headlamps illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the commu-
nication circuit are normal.

Headlamp Relay (Low-Beam) Circuit

ETACS-ECU

HEADLAMP
RELAY (LO)

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 SI : Silver

ENGINE
COMPARTMENT

RELAY BOX

NOTE

: EXCEPT 1800-DIESEL
: 1800-DIESEL

FUSIBLE
LINK

38

FUSIBLE
LINK

36

AC612144

AC801941

AF

Connector: A-28X

ACA00886

AJ

Connector: C-312 <LHD>
ETACS-ECU