Mitsubishi L200. Manual - part 821

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-43

FUNCTION
When diagnosing the CAN bus lines, the M.U.T.-III 
measures the voltage of CAN_H and CAN_L line and 
detects the short to power supply or earth.

TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble when it is impossi-
ble to receive the periodically sent data and the volt-
age of CAN_H or CAN_L line is less than 1.0 V.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-44

TROUBLESHOOTING HINTS

• Malfunction of the wiring harness

• Malfunction of the connector

• Malfunction of each ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-45

DIAGNOSIS PROCEDURE

STEP 1. Check the CAN bus lines. Resistance 
measurement at C-22 diagnosis 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

.

NOTE: This inspection allows you to check that there 
is a short to earth in either CAN_H line or CAN_L 
line. Thus, in the following steps, check the CAN bus 
line that is defective.

AC903856BQ

Connector: C-22 <LHD>

C-22 (B)

Harness side 
(Front side)

AC903868

CK

C-22 (B)

Connector: C-22 <RHD>

Harness side 
(Front side)

AC903853

BV

Connector: C-103 <LHD>

C-103 (B)

Harness side

AC903865 AY

Connector: C-103 <RHD>

Harness side

C-103 (B)

AC509934

Connector: C-219 <LHD>

AD

C-219 (GR)

Harness side

Junction block

AC509943

Connector: C-219 <RHD>

AB

C-219 (GR)

Harness side

Junction block
 (Rear view)

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-46

(1) Disconnect engine-ECU connector C-103 and 

ETACS-ECU connector C-219, and measure the 
resistance at harness side of diagnosis connector 
C-22.

CAUTION

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

P.54C-7

.

(2) Ensure that the negative battery terminal is 

disconnected.

AC209364RJ

Harness side: C-22

Test 
harness

(3) Resistance between C-22 diagnosis connector 

terminal No.6 (CAN_H) and body earth

OK: 1 k

Ω or more

AC209364

Harness side: C-22

Test 
harness

AC209364RK

(4) Resistance between C-22 diagnosis connector 

terminal No.14 (CAN_L) and body earth

OK: 1 k

Ω or more

Q: Is the check result normal?