Mitsubishi Lancer (4A9 engine). Manual - part 260

 

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Mitsubishi Lancer (4A9 engine). Manual - part 260

 

 

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-64

AC801250

Connectors: A-04, A-58 <LHD>

AB

A-04 (B), 
A-58 (B)

AC801253

AG

Connector: A-58 <RHD>

A-58 (B)

ACB02645

AH

Connector: C-124 <LHD>

C-124 (GR)

ACB02647

AE

C-124 (GR)

Connector: C-124 <RHD>

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-65

FUNCTION
If the M.U.T.-III cannot communicate with the ABS-
ECU <vehicles without ASC> or ASC-ECU <vehicles 
with ASC>, this diagnosis result will be set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the ABS-ECU 
<vehicles without ASC> or ASC-ECU <vehicles with 
ASC>, the ETACS-ECU determines that there is a 
failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN3) or ABS-ECU connector <vehicles without 
ASC> or ASC-ECU connector <vehicles with 
ASC> improperly connected]

• Malfunction of the wiring harness [open circuit 

between the ABS-ECU <vehicles without ASC> 
or ASC-ECU <vehicles with ASC> and the joint 
connector (CAN3), power supply circuit to the 
ABS-ECU <vehicles without ASC> or ASC-ECU 
<vehicles with ASC>]

• Malfunction of the ABS-ECU <vehicles without 

ASC> or ASC-ECU <vehicles with ASC>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-04 ABS-ECU 
connector <vehicles without ASC> or A-58 ASC-
ECU connector <vehicles with ASC> 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 A-04 
ABS-ECU connector <vehicles without ACS> or 
A-58 ASC-ECU connector <vehicles with ASC> 
and C-124 joint connector (CAN3)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect ABS-ECU connector <vehicles without 
ASC> or ASC-ECU connector <vehicles with ASC> 
and joint connector (CAN3), and check the following 
wiring harness for open circuit.
(1) The wiring harness between A-04 ABS-ECU 

connector terminal No.4 <vehicles without ASC> 
or A-58 ASC-ECU connector terminal No.12 
<vehicles with ASC> and C-124 joint connector 
(CAN3) terminal No.9 <CAN_H>

OK: Continuity exists (2 

 or less)

(2) The wiring harness between A-04 ABS-ECU 

connector terminal No.6 <vehicles without ASC> 
or A-58 ASC-ECU connector terminal No.13 
<vehicles with ASC> and C-124 joint connector 
(CAN3) terminal No.20 <CAN_L>

OK: Continuity exists (2 

 or less)

Q: Is the check result normal?

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-66

YES : 

Check the power supply circuit of the ABS-

ECU <vehicles without ASC> or ASC-ECU 
<vehicles without ASC>. Refer to GROUP 
35C 

− Troubleshooting  <vehicles without 

ASC> or Refer to GROUP 35C 

− 

Troubleshooting  <vehicles with ASC>.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-67

Diagnosis Item 9: Diagnose when the M.U.T.-III cannot receive the data sent by headlamp automatic 
levelling-ECU <vehicles with AFS>

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.

 

 

 

 

 

 

 

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