Mitsubishi Lancer (4A9 engine). Manual - part 242

ACA00886

AF

Connectors: C-301, C-317 <LHD>
ETACS-ECU

C-317

C-301

ACA00887

AF

Connectors: C-301, C-317 <RHD>
ETACS-ECU

C-317

C-301

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-19

JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1109 
when no signals are received from the column switch 
(column switch ECU).

PROBABLE CAUSES

• Faulty Lighting switch

• Malfunction of the LIN bus

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-301 ETACS-ECU 
connector, C-201 column switch connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Resistance measurement at the C-201 
column switch connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the C-201 

column switch connector terminal No. 4 and the 
body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

STEP 3. Wiring harness check from C-201 
column switch connector terminal No. 4 to body 
earth
Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the wiring harness.

STEP 4. Voltage measurement at the C-201 
column switch connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the voltage between the C-201 column 

switch connector terminal No. 1 and the body 
earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Wiring harness check between the C-201 
column switch connector terminal No. 1 and the 
C-317 ETACS-ECU connector terminal No. 10
Check the power supply line for open circuit and 
short circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Repair the wiring harness.

STEP 6. Check the wiring harness wires between 
C-301 ETACS-ECU connector terminal No. 1 and 
C-201 column switch connector terminal No. 3.
Check the communication lines for open circuit and 
short circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(1) Erase the diagnosis code.

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-20

(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 lighting switch <LHD> or wiper/

washer switch <RHD>.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the column switch and the ETACS-
ECU (Refer to GROUP 00 

− How to Cope 

with Intermittent Malfunction ).

Code No.U150B Column SW checksum error

JUDGMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U150B 
when abnormal signals are received from the column 
switch (column switch ECU).

PROBABLE CAUSES

• Faulty lighting switch

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the 
ETACS-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 lighting switch.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the column switch and the ETACS-
ECU (Refer to GROUP 00 

− How to Cope 

with Intermittent Malfunction ).

Code No.U150C P/W SW (DR) checksum error

JUDGMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U150C 
when abnormal signals are received from the power 
window main switch.

PROBABLE CAUSES

• Faulty power window main switch

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the 
ETACS-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 power window main switch.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the power window main switch and 
the ETACS-ECU (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

Code No.U1511 Sunroof checksum error <Vehicles with sunroof>

JUDGMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1511 
when abnormal signals are received from the sun-
roof motor assembly.

PROBABLE CAUSES

• Faulty sunroof motor assembly

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-21

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the 
ETACS-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 sunroof motor assembly.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the sunroof motor assembly and 
the ETACS-ECU (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

Code No.U1512 Lighting control sensor checksum error <Vehicles with auto lamp>

JUDGMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1512 
when abnormal signals are received from the lighting 
control sensor.

PROBABLE CAUSES

• Faulty lighting control sensor

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the 
ETACS-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 lighting control sensor.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the lighting control sensor and the 
ETACS-ECU (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction ).

Code No.U1514 Bit error (LIN)

JUDGMENT CRITERIA
The ETACS-ECU receives and sends data simulta-
neously. If the data contains a fault, the ETACS-ECU 
will set diagnosis code No. U1514. 

PROBABLE CAUSES

• Malfunction of the slave ECU

• Malfunction of the ETACS-ECU

• Electrical noise generated in the LIN bus lines

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the 
ETACS-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?

A diagnosis code other than No. U1514 is set. : 

Replace the appropriate ECU.

Diagnosis code No. U1514 is set. : 

Replace the 

ETACS-ECU.

The diagnosis code is not set. : 

The trouble can be 

an intermittent malfunction (GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-22

Code No.U1515 No-bus activity error (LIN)

LIN Communication Circuit

LIN DRIVE CIRCUIT

ETACS-ECU

INTERFACE CIRCUIT

SUNROOF 
MOTOR 
ASSEMBLY

LIGHTING 
CONTROL 
SENSOR

COLUMN 
SWITCH

SECURITY 
ALARM 
SENSOR

SECURITY 
ALARM SIREN

LIN 
CUTOFF 
CONTROL 
UNIT

POWER WINDOW 
MAIN SWITCH

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

RHD

:

LHD

:

NOTE