Mitsubishi L200. Manual - part 818

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-31

STEP 9. M.U.T.-III CAN bus diagnostics [RV meter 
connector disconnected]

AC903856

Connector: C-171 <LHD>

AY

Harness side

C-171 (GR)

AC903868

Connector: C-171 <RHD>

BQ

Harness side

C-171 (GR)

(1) Disconnect RV meter connector C-171, 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 : 

Repair the wiring harness between joint 

connector (CAN1) and the RV meter 
connector.

NO : 

Check the RV meter connector, and repair if 
necessary. If the RV meter connector is in 
good condition, repair the RV meter power 
supply circuit. (Refer to GROUP 54A 

− RV 

meter .)

STEP 10. Check the CAN line between joint 
connector (CAN1) and the ABS-ECU. 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

AC209365RS

Harness side: C-119

Test 
harness

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

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-32

terminal No.5 (CAN_H) and body earth

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test 
harness

AC209365

AC209365

AC209365RT

Harness side: C-119

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

terminal No.16 (CAN_L) and body earth

OK: 4.0 V or less

(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 <vehicles without A/C> : 

<4.0 V or less> Go 

to Step 22.

YES <vehicles with A/C> : 

<4.0 V or less> Go to 

Step 20.

NO  : 

<More than 4.0 V> Go to Step 11.

STEP 11. M.U.T.-III CAN bus diagnostics [ABS-
ECU connector disconnected]

AC903897

Connector: A-01

AN

A-01 (GR)

Harness side

(1) Disconnect ABS-ECU connector A-01, 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 : 

Check the intermediate connector (C-13), 

and repair if necessary. If the intermediate 
connector is in good condition, repair the 
wiring harness between joint connector 
(CAN1) and the ABS-ECU connector.

NO : 

Check the ABS-ECU connector, and repair 
if necessary. If the ABS-ECU connector is in 
good condition, go to Step 12.

STEP 12. 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 ABS-ECU connector, and repair 
if necessary. If the ABS-ECU connector is in 
good condition, replace the hydraulic unit 
assembly.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-33

STEP 13. Check the CAN line between joint 
connector (CAN1) and the ASTC-ECU. 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

AC209365RS

Harness side: C-119

Test 
harness

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

terminal No.5 (CAN_H) and body earth

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test 
harness

AC209365

AC209365

AC209365RT

Harness side: C-119

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

terminal No.16 (CAN_L) and body earth

OK: 4.0 V or less

(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 : 

<4.0 V or less> Go to Step 16.

NO : 

<More than 4.0 V> Go to Step 14.

STEP 14. M.U.T.-III CAN bus diagnostics [ASTC-
ECU connector disconnected]

AC903897

Connector: A-48

AO

A-48 (B)

Harness side

(1) Disconnect ASTC-ECU connector A-48, 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.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-34

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

illustration?
YES : 

Check the intermediate connector (C-13), 

and repair if necessary. If the intermediate 
connector is in good condition, repair the 
wiring harness between joint connector 
(CAN1) and the ASTC-ECU connector.

NO : 

Check the ASTC-ECU connector, and repair 
if necessary. If the ASTC-ECU connector is 
in good condition, go to Step 15.

STEP 15. 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 ASTC-ECU connector, and repair 
if necessary. If the ASTC-ECU connector is 
in good condition, replace the hydraulic unit 
assembly.

STEP 16. Check the CAN line between joint 
connector (CAN1) and the steering wheel sensor. 
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

AC209365RU

Harness side: C-119

Test 
harness

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