Mitsubishi Lancer (4A9 engine). Manual - part 110

 

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Mitsubishi Lancer (4A9 engine). Manual - part 110

 

 

HEADLAMP

CHASSIS ELECTRICAL

54A-102

Code No. B2512 ECU internal error (EEPROM)

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.
DIAGNOSTIC FUNCTION
If a trouble occurs in headlamp automatic levelling-
ECU, AFS or headlamp automatic levelling system 
warnings are displayed on the multi information dis-
play and code No. B2512 is stored.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU detects the 
data error at EEPROM reading or writing.

PROBABLE CAUSE
Malfunction of the headlamp automatic levelling-
ECU

DIAGNOSIS PROCEDURE

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.U0001 Bus off (CAN-C)

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 headlamp automatic levelling-ECU is returned 
from the bus-off state or when the bus-off error is 
indicated to the headlamp automatic levelling-ECU 
state, AFS warnings are displayed on the multi infor-
mation display and code No. U0001 (CAN-C) is 
stored.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU judges the 
bus-off error.

PROBABLE CAUSES

• Malfunction of the headlamp automatic levelling-

ECU

• Malfunction of wiring harness or connector

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. Check whether the diagnosis code is 
reset.
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 "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 ).

HEADLAMP

CHASSIS ELECTRICAL

54A-103

Code No. U0100 Engine CAN time-out

CAUTION

• If the diagnosis code No. U0100 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.U0100 when it cannot receive signals 
from the engine ECU.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU cannot 
receive the signal from the engine-ECU via the CAN 
bus line.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of engine-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 if diagnosis code is set to the engine-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the engine (Refer to GROUP 

13A 

− 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. U0100 is set to 
ETACS-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 engine-ECU.

NO : 

A poor connection, open circuit, or other 
intermittent malfunction in the CAN bus line 
between the headlamp automatic levelling-
ECU and the engine-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 engine-ECU. (Refer to 
GROUP 00 

− How to Use Troubleshooting/

Inspection Service Points - How to Cope 
with Intermittent Malfunction .)

HEADLAMP

CHASSIS ELECTRICAL

54A-104

Code No.U0121 ASC/ABS CAN time-out

CAUTION

• If the diagnosis code No. U0121 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.U0121 when it cannot receive signals 
from the ABS-ECU or ASC-ECU. In addition, the 
AFS or headlamp automatic levelling system warning 
is displayed on the multi information display.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU cannot 
receive the signal from the ABS-ECU or ASC-ECU 
via the CAN bus line.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of ABS-ECU or ASC-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 if diagnosis code is set to the ABS-ECU or 
ASC-ECU.

Q: Is the diagnosis code set to the any of the above?

Set to the ABS-ECU. : 

Troubleshoot the ABS. 

Refer to GROUP 35B 

− Troubleshooting .

Set to the ASC-ECU. : 

Troubleshoot the ASC. 

Refer to GROUP 35C 

− 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. U0121 is set to 
ETACS-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 ABS-ECU or ASC-ECU.

NO : 

A poor connection, open circuit, or other 
intermittent malfunction in the CAN bus line 
between the headlamp automatic levelling-
ECU and the ABS-ECU or ASC-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 ABS-ECU or ASC-ECU. 
(Refer to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points - 
How to Cope with Intermittent Malfunction .)

HEADLAMP

CHASSIS ELECTRICAL

54A-105

Code No. U0126 Steering wheel sensor CAN time-out

CAUTION

• If the diagnosis code No. U0126 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. U0126 when it cannot receive signals 
from the steering wheel sensor. In addition, the AFS 
warning is displayed on the multi information display.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU cannot 
receive the signal from the steering wheel sensor via 
the CAN bus line.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of steering wheel sensor

• 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 if diagnosis code is set to the steering wheel 
sensor.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the steering wheel sensor. 

Refer to GROUP 35C 

− 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. U0126 is set to 
ETACS-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 steering wheel sensor.

NO : 

A poor connection, open circuit, or other 
intermittent malfunction in the CAN bus line 
between the headlamp automatic levelling-
ECU and the steering wheel sensor. (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 steering wheel sensor. (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points - 
How to Cope with Intermittent Malfunction .)

 

 

 

 

 

 

 

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