Mitsubishi Lancer (4A9 engine). Manual — part 261

CAN-C Communication Circuit <Except for RALLIART>

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

ASC-ECU

A/T-ECU

ABS-ECU

CVT-ECU

STEERING
WHEEL SENSOR
<AFS, ASC>

ENGINE-ECU

ELECTRIC
POWER
STEERING-ECU

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

CORNER SENSOR/
BACK SENSOR-ECU

DIESEL

:

PETROL

:

1800-PETROL, 2000

:

NOTE

PETROL (EXCEPT SOHC)

:

VEHICLES WITHOUT ASC

:

VEHICLES WITH ASC

:

HEADLAMP
AUTOMATIC
LEVELLING-ECU

AS&G-ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-68

ACA00830AC

Connector: C-14 <LHD>

C-14

ACB02647

AF

C-124 (GR)

C-14

Connectors: C-14, C-124 <RHD>

ACB02645

AH

Connector: C-124 <LHD>

C-124 (GR)

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-69

CAUTION

When servicing a CAN bus line, earth yourself by
touching a metal object such as an unpainted
water pipe. If you fail to do, a component con-
nected to the CAN bus line may be broken.
FUNCTION
If the M.U.T.-III cannot communicate with the head-
lamp automatic levelling-ECU, this diagnosis result
will be set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the headlamp
automatic levelling-ECU, the ETACS-ECU deter-
mines that there is a failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector

(CAN3) or headlamp automatic levelling-ECU
improperly connected]

• Malfunction of the wiring harness [open circuit

between the headlamp automatic levelling-ECU
and the joint connector (CAN3), power supply cir-
cuit to the headlamp automatic levelling-ECU]

• Malfunction of the headlamp automatic levelling-

ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-14 headlamp
automatic levelling-ECU connector and C-124
joint connector (CAN3)

CAUTION

The strand end of the twist wire should be within
10 cm from the connector. For details refer to .

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the defective connector.

STEP 2. Check the wiring harness between C-14
headlamp automatic levelling-ECU connector
and C-124 joint connector (CAN3)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect headlamp automatic levelling-ECU con-
nector and joint connector (CAN3), and check the fol-
lowing wiring harness for open circuit.
(1) The wiring harness between C-14 headlamp

automatic levelling-ECU connector terminal
No.23 and C-124 joint connector (CAN3) terminal
No.8 <Diesel> or 7 <Petrol> <CAN_H>

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-14 headlamp

automatic levelling-ECU connector terminal
No.22 and C-124 joint connector (CAN3) terminal
No.19 <Diesel> or 18 <Petrol> <CAN_L>

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Check the power supply circuit of the

headlamp automatic levelling-ECU. Refer to
GROUP 54A

− Headlamp −

Troubleshooting .

NO :

Repair the wiring harness.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-70

Diagnosis Item 10: Diagnose when the M.U.T.-III cannot receive the data sent by electric power
steering-ECU <vehicles with electric power steering>

CAUTION

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

CAN-C Communication Circuit <Except for RALLIART>

ETACS-ECU

INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

ASC-ECU

A/T-ECU

ABS-ECU

CVT-ECU

STEERING
WHEEL SENSOR
<AFS, ASC>

ENGINE-ECU

ELECTRIC
POWER
STEERING-ECU

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

CORNER SENSOR/
BACK SENSOR-ECU

DIESEL

:

PETROL

:

1800-PETROL, 2000

:

NOTE

PETROL (EXCEPT SOHC)

:

VEHICLES WITHOUT ASC

:

VEHICLES WITH ASC

:

HEADLAMP
AUTOMATIC
LEVELLING-ECU

AS&G-ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-71