Mitsubishi L200. Manual - part 843

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-131

Diagnosis Item 12: Diagnose when the M.U.T.-III cannot receive the data sent by A/T-ECU. <A/T>

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.

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

A/T-ECU

DIAGNOSIS 
CONNECTOR

ENGINE-ECU

STEERING 
WHEEL 
SENSOR

G AND 
YAW RATE 
SENSOR

A/C-ECU

ABS-ECU

ASTC-ECU

ETACS-ECU

RV METER

NOTE

:VEHICLES WITH ABS
:VEHICLES WITH ASTC
:VEHICLES WITH RV METER
:VEHICLES WITH AUTOMATIC-A/C
:LHD
:RHD
:A/T

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-132

FUNCTION
The diagnostic result demonstrates that "the M.U.T.-
III cannot receive the sent data from the A/T-ECU" 
when the M.U.T.-III checks the periodically sent data 
from each ECU.

TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when the periodically 
sent data from A/T-ECU cannot be received. 

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-133

PROBABLE CAUSES

• Damaged harness wires and connectors

• Power supply circuit malfunction of the A/T-ECU

• Malfunction of the A/T-ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-134

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-01 joint connector 
(CAN2) and C-20 A/T-ECU connector

AC903853

BL

Connector: C-01 <LHD>

C-01 (L)

AC903865AU

Connector: C-01 <RHD>

C-01 (L)

AC903856BR

Connector: C-20 <LHD>

Harness side

AC903868

CL

Connector: C-20 <RHD>

Harness side

CAUTION

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

P.54C-7

.

AC209350

1

12

2

13

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14

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15

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16

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18

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20

10

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22

AC209350

1

12

2

13

3

14

4

15

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16

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17

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18

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19

9

20

10

21

11

22

AC

Short pin

When checking the joint connector, ensure that its 
wiring harness side and its short pins are not dam-
aged.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector. Replace the 
joint connector as necessary.