Mitsubishi L200. Manual - part 820

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-39

STEP 22. Check the CAN line between joint 
connector (CAN1) and the diagnosis connector. 
Voltage measurement at C-119 joint connector 
(CAN1).

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

.

AC903853

BM

Connector: C-119 <LHD>

C-119 (GR)

AC903868

CM

Connector: C-119 <RHD>

C-119 (GR)

(1) Disconnect joint connector (CAN1), and measure 

at the wiring harness side.

(2) Connect the negative battery terminal, and turn 

the ignition switch to the ON position.

AC209365

AC209365

AC209365

AC209365

AC209365SA

Harness side: C-119

Test harness

(3) Voltage between C-119 joint connector (CAN1) 

terminal No.10 (CAN_H) and body earth

OK: Less than 1.0 V

AC209365

AC209365

AC209365

Test harness

AC209365

AC209365

AC209365SB

Harness side: C-119

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

terminal No.21 (CAN_L) and body earth

OK: Less than 1.0 V

(5) Disconnect the negative battery terminal.

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to 

P.54C-7

.

Q: Is the check result normal?

YES : 

<Less than 1.0 V> Repair the intermediate 

connector, or the wiring harness between 
joint connector (CAN1) and the intermediate 
connector C-53 <LHD> or C-35 <RHD>.

NO : 

<1.0 V or more> Repair the diagnosis 
connector, or the wiring harness between 
joint connector (CAN1) and the diagnosis 
connector.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-40

STEP 23. M.U.T.-III CAN bus diagnostics [engine-
ECU connector disconnected]

AC903853

BV

Connector: C-103 <LHD>

C-103 (B)

Harness side

AC903865 AY

Connector: C-103 <RHD>

Harness side

C-103 (B)

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

diagnose by using the M.U.T.-III.

ACA01247

: Red section on screen

AB

ETACS

DISPLAY

ABS/ASC

SAS

YR/G

A/C

AT

ENGINE

JC

JC

M.U.T.

(2) Diagnose CAN bus lines, and check if M.U.T.-III 

screen is as shown in the illustration.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Go to Step 25.

NO : 

Check the engine-ECU connector, and 
repair if necessary. If the engine-ECU 
connector is in good condition, go to Step 
24.

STEP 24. M.U.T.-III CAN bus diagnostics (retest 
the system)
Diagnose CAN bus lines, and check if M.U.T.-III 
screen shows normal state.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Check the engine-ECU connector, and 
repair if necessary. If the engine-ECU 
connector is in good condition, replace the 
engine-ECU.

STEP 25. M.U.T.-III CAN bus diagnostics [ETACS-
ECU connector disconnected]

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)

(1) Disconnect ETACS-ECU connector C-219, and 

diagnose by using the M.U.T.-III.

ACA01247

: Red section on screen

AB

ETACS

DISPLAY

ABS/ASC

SAS

YR/G

A/C

AT

ENGINE

JC

JC

M.U.T.

(2) Diagnose CAN bus lines, and check if M.U.T.-III 

screen is as shown in the illustration.

Q: Does M.U.T.-III screen correspond to the 

illustration?

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-41

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Check the ETACS-ECU connector, and 
repair if necessary. If the ETACS-ECU 
connector is in good condition, go to Step 
26.

STEP 26. M.U.T.-III CAN bus diagnostics (retest 
the system)
Diagnose CAN bus lines, and check if M.U.T.-III 
screen shows normal state.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Check the ETACS-ECU connector, and 
repair if necessary. If the ETACS-ECU 
connector is in good condition, replace the 
ETACS-ECU.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-42

Diagnosis Item 2: Diagnose shorts in the earth to CAN bus line

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.