Mitsubishi L200. Manual - part 840

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-119

FUNCTION
The diagnostic result demonstrates that "the M.U.T.-
III cannot receive the sent data from the A/C-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/C-ECU cannot be received 

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-120

PROBABLE CAUSES

• Damaged harness wires and connectors

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

• Malfunction of the A/C-ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-121

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-119 joint connector 
(CAN1) and C-43 A/C-ECU connector

AC903856BS

Connector: C-43 <LHD>

Harness side

AC903868

CN

Connector: C-43 <RHD>

Harness side

AC903853

BM

Connector: C-119 <LHD>

C-119 (GR)

AC903868

CM

Connector: C-119 <RHD>

C-119 (GR)

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

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

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.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-122

STEP 2. Resistance measurement at C-119 joint 
connector (CAN1) and C-43 A/C-ECU connector.

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54C-7

.

CAUTION

The test wiring harness should be used. For 
details refer to 

P.54C-7

.

AC903856BS

Connector: C-43 <LHD>

Harness side

AC903868

CN

Connector: C-43 <RHD>

Harness side

AC903853

BM

Connector: C-119 <LHD>

C-119 (GR)

AC903868

CM

Connector: C-119 <RHD>

C-119 (GR)

(1) Disconnect joint connector (CAN1) and the A/C-

ECU connector, and measure at the wiring 
harness side.

(2) Turn the ignition switch to the LOCK (OFF) 

position.

CAUTION

When measuring the resistance, disconnect the 
negative battery terminal. For details refer to 

P.54C-7

.

(3) Ensure that the negative battery terminal is 

disconnected.

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

Harness side: C-43

Harness side: C-119

IB

Test harness

Test 
harness

(4) Continuity between C-119 joint connector (CAN1) 

terminal No.6 and C-43 A/C-ECU connector