Mitsubishi Lancer (4A9 engine). Manual - part 107

 

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Mitsubishi Lancer (4A9 engine). Manual - part 107

 

 

HEADLAMP

CHASSIS ELECTRICAL

54A-90

SYMPTOM CHART

NOTE: 

.

1. The numbers indicate the sequence in which the 

component is checked.

2. For the troubleshooting of other than the above, 

refer to Trouble Symptom Chart .

3. If ETACS-ECU fails, only the low-beam head-

lamps will illuminate as a fail-safe measure.

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1540104200305

Refer to GROUP 00 

− Contents of troubleshooting .

DIAGNOSIS FUNCTION

M1540104300380

HOW TO READ DIAGNOSIS CODE

Refer to GROUP 00 

− Diagnosis function .

HOW TO ERASE DIAGNOSIS CODE

Refer to GROUP 00 

− Diagnosis function .

AFS WARNING LAMP AND AFS WARN-
ING DISPLAY

DIAGNOSIS CODE CHART

M1540101400548

CAUTION

On troubleshooting, if the ignition switch is turned ON while disconnecting connector(s), diagnosis 
code(s) associated with other system may be set. On completion, confirm all systems for diagnosis 
code(s). If diagnosis code(s) are set, erase them all.
ETACS-ECU

Item to be checked

Trouble symptom
The headlamps do not 
illuminate.

The headlamps flicker.

The headlamps are dim.

Fuse

1

−

−

Wiring harness and 
connector

2

1

−

Column switch

3

−

−

Bulb

4

2

1

Controller

5

3

2

ETACS-ECU

6

4

−

Parts name

Functional description

Combination 
meter (AFS 
warning lamp)

When an AFS abnormality 
occurs, the AFS warning lamp 
flashes to inform the driver of the 
AFS abnormality.

Combination 
meter (AFS 
warning display)

When an AFS abnormality 
occurs, indicates the warnings 
on the multi-information display 
of combination meter to inform 
the driver of the AFS 
abnormality.

SERVICE
         REQUIRED

AC809280

SERVICE
         REQUIRED

AC809280

AFS warning 
display

AFS warning
lamp

AC

Diagnosis code No.

Diagnostic item

Reference page

B16A2

Blown turn-signal lamp (LH) bulb

HEADLAMP

CHASSIS ELECTRICAL

54A-91

LIN <VEHICLES WITH LIGHTING CONTROL SEN-
SOR>

NOTE: *: Rain light sensor (Lighting control sensor)

HEADLAMP AUTOMATIC LEVELLING-ECU

DIAGNOSIS CODE PROCEDURES

Code No.B16A2 Blown turn-signal lamp (LH) bulb

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.

B16A3

Turn-signal lamp (LH) short circuit

B16A4

Blown turn-signal lamp (RH) bulb

B16A5

Turn-signal lamp (RH) short circuit

Diagnosis code No.

Diagnostic item

Reference page

Diagnosis code No.

Diagnostic item

Reference page

L0432

RLS* RS adaptation error

L0434

RLS* light sensor error

L0436

RLS* rain sensor error

Diagnosis code No.

Diagnostic item

Reference page

B2358

AFS OFF SW short circuit

B2507

Steering wheel sensor error

B2509

Steering wheel sensor not initialized

B2511

ECU internal error (ROM)

B2512

ECU internal error (EEPROM)

U0001

Bus-off (CAN-C)

U0100

Engine CAN time-out

U0121

ASC/ABS CAN time-out

U0126

Steering wheel sensor CAN time-out

U0141

ETACS CAN time-out

U1415

Coding not completed/failed

U1417

Abnormality in coding data

ACA00916

A-09 (B)

Connectors: A-09, A-35

AH

A-35 (B)

ACA00886

BC

Connectors: C-304, C-311 <LHD>

ETACS-ECU

C-304

C-311

HEADLAMP

CHASSIS ELECTRICAL

54A-92

DIAGNOSTIC FUNCTION
When the left bulb of turn-signal lamp is blown, the 
ETACS-ECU sets diagnosis code No. B16A2.

JUDGEMENT CRITERIA
The ETACS-ECU sets diagnosis code No. B16A2 
under the following conditions.

i. With the diagnosis code not set, if there is a mal-

function to the left turn-signal lamp bulb, the 
blown left bulb counter counts once when the illu-
mination of hazard or turn-signal lamp (left side) 
is attempted.

ii. If the blown left bulb counter reaches "3," diagno-

sis code No. B16A2 is set.

PROBABLE CAUSES

• Malfunction of turn-signal lamp bulb (left)

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Bulb check
Check whether the bulb of turn-signal lamp which 
does not illuminate is normal.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the bulb of turn-signal lamp which 
does not illuminate.

STEP 2. Connector check: A-35 headlamp 
assembly (LH) connector, A-09 side turn-signal 
lamp (LH) connector and F-23 <LANCER> or F-49 
<LANCER SPORTBACK> rear turn-signal lamp 
(LH) connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO  : 

Repair the defective connector.

STEP 3. Resistance measurement at the A-35 
front combination lamp (LH) connector, A-09 side 
turn-signal lamp (LH) connector and F-23 
<LANCER> or F-49 <LANCER SPORTBACK> rear 
turn-signal lamp (LH) connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the connector 

terminal of lamp which does not illuminate and 
the body earth.

• Measure the resistance between the A-35 

headlamp assembly (LH) connector terminal 
No. 6 and the body earth.

• Measure the resistance between the A-09 

side turn-signal lamp (LH) connector terminal 
No. 1 and the body earth.

• Measure the resistance between the F-23 

<LANCER> or F-49 <LANCER SPORT-
BACK> rear turn-signal lamp (LH) connector 
terminal No. 1 and the body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

ACA00887

BD

Connectors: C-304, C-311 <RHD>

ETACS-ECU

C-304

C-311

AC612744 BJ

Connector: F-23 <LANCER>

AC801775BQ

Connector: F-49 <LANCER SPORTBACK>

HEADLAMP

CHASSIS ELECTRICAL

54A-93

STEP 4. Wiring harness check between A-35 
headlamp assembly (LH) connector terminal No. 
6, A-09 side turn-signal lamp (LH) connector 
terminal No. 1 or F-23 <LANCER> or F-49 
<LANCER SPORTBACK> rear turn-signal lamp 
(LH) connector terminal No. 1 and the body earth

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 5. Connector check: C-304 and C-311 
ETACS-ECU connectors

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Wiring harnesses check between A-35 
headlamp assembly (LH) connector terminal No. 
3, A-09 side turn-signal lamp (LH) connector 
terminal No. 2 or F-23 <LANCER> or F-49 
<LANCER SPORTBACK> rear turn-signal lamp 
(LH) connector terminal No. 2 and C-304 ETACS-
ECU connector terminal No. 9 or C-311 ETACS-
ECU connector terminal No. 18
NOTE: Before the wiring harness check, check the 
intermittent connector D-16, and then repair that if 
necessary.

• Check the output lines for open 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.
(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 ETACS-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.B16A3 Turn-signal lamp (LH) short circuit

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.

ACA00916

A-09 (B)

Connectors: A-09, A-35

AH

A-35 (B)

ACA00886

BC

Connectors: C-304, C-311 <LHD>

ETACS-ECU

C-304

C-311

 

 

 

 

 

 

 

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