Mitsubishi Lancer (4A9 engine). Manual - part 259

 

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Mitsubishi Lancer (4A9 engine). Manual - part 259

 

 

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-60

Diagnosis Item 7: Diagnose when the M.U.T.-III cannot receive the data sent by corner sensor/back 
sensor-ECU <Vehicles with reversing sensor system>

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-61

ACB02645

AF

C-03 (GR)

Connectors: C-03, C-40

C-40

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-62

FUNCTION
If the M.U.T.-III cannot communicate with the corner 
sensor/back sensor-ECU, this diagnosis result will be 
set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for the corner sen-
sor/back sensor-ECU, the ETACS-ECU determines 
that there is a failure.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN2) or corner sensor/back sensor-ECU con-
nector improperly connected]

• Malfunction of the wiring harness [open circuit 

between the corner sensor/back sensor-ECU and 
the joint connector (CAN2), power supply circuit 
to the corner sensor/back sensor-ECU]

• Malfunction of the corner sensor/back sensor-

ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-40 corner sensor/
back sensor-ECU connector and C-03 joint 
connector (CAN2)

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-40 
corner sensor/back sensor-ECU connector and 
C-03 joint connector (CAN2)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect corner sensor/back sensor-ECU connec-
tor and joint connector (CAN2), and check the follow-
ing wiring harness.
(1) Check that there is continuity between C-40 

corner sensor/back sensor-ECU connector 
terminal No.19 and C-03 joint connector (CAN2) 
terminal No.7 <CAN_H>

OK: Continuity exists (2 

 or less)

(2) Check that there is continuity between C-40 

corner sensor/back sensor-ECU connector 
terminal No.20 and C-03 joint connector (CAN2) 
terminal No.18 <CAN_L>

OK: Continuity exists (2 

 or less)

Q: Is the check result normal?

YES : 

Check the power supply circuit of the corner 

sensor/back sensor-ECU. Refer to Group 
54A 

− Troubleshooting .

NO : 

Repair the wiring harness.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-63

Diagnosis Item 8: Diagnose when the M.U.T.-III cannot receive the data sent by ABS-ECU <vehicles 
without ASC> or ASC-ECU <vehicles with ASC>

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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