Mitsubishi L200. Manual - part 817

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-27

YES <M/T> : 

<4.0 V or less> Repair intermediate 

connector C-53 <LHD> or C-35 <RHD>, or 
the wiring harness between joint connector 
(CAN2) and intermediate connector C-53 
<LHD> or C-35 <RHD>.

YES <A/T> : 

<4.0 V or less> Go to Step 4.

NO  : 

<More than 4.0 V> Repair the wiring 
harness between joint connector (CAN2) 
and the engine-ECU connector.

STEP 4. Check the CAN line between joint 
connector (CAN2) and the A/T-ECU. Voltage 
measurement at C-01 joint connector (CAN2).

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

BL

Connector: C-01 <LHD>

C-01 (L)

AC903865AU

Connector: C-01 <RHD>

C-01 (L)

(1) Disconnect joint connector (CAN2), 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

AC209365RK

Harness side: C-01

Test harness

(3) Voltage between C-01 joint connector (CAN2) 

terminal No.10 (CAN_H) and body earth <LHD>

OK: 4.0 V or less

AC209365

AC209365

AC209365

AC209365

AC209365VX

Harness side: C-01

Test harness

(4) Voltage between C-01 joint connector (CAN2) 

terminal No.9 (CAN_H) and body earth <RHD>

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test harness

AC209365

AC209365

AC209365PP

Harness side: C-01

(5) Voltage between C-01 joint connector (CAN2) 

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-28

terminal No.21 (CAN_L) and body earth <LHD>

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test harness

AC209365

AC209365

AC209365VZ

Harness side: C-01

(6) Voltage between C-01 joint connector (CAN2) 

terminal No.20 (CAN_L) and body earth <RHD>

OK: 4.0 V or less

(7) Disconnect the negative battery terminal.

Q: Is the check result normal?

YES : 

<4.0 V or less> Repair intermediate 

connector C-53 <LHD> or C-35 <RHD>, or 
the wiring harness between joint connector 
(CAN2) and the intermediate connector C-
53 <LHD> or C-35 <RHD>.

NO : 

<More than 4.0 V> Go to Step 5.

STEP 5. M.U.T.-III CAN bus diagnostics [A/T-ECU 
connector disconnected]

AC903856BR

Connector: C-20 <LHD>

Harness side

AC903868

CL

Connector: C-20 <RHD>

Harness side

(1) Disconnect A/T-ECU connector C-20, 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 (CAN2) and the A/T-ECU 
connector.

NO : 

Check the A/T-ECU connector, and repair if 
necessary. If the A/T-ECU connector is in 
good condition, go to Step 6.

STEP 6. 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 A/T-ECU connector, and repair if 
necessary. If the A/T-ECU connector is in 
good condition, replace the A/T-ECU.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-29

STEP 7. Check the CAN line between joint 
connector (CAN1) and the ETACS-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

AC209365RM

Harness side: C-119

Test harness

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

terminal No.9 (CAN_H) and body earth

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test harness

AC209365

AC209365

AC209365RN

Harness side: C-119

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

terminal No.20 (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 8.

NO : 

<More than 4.0 V> Repair the wiring 
harness between joint connector (CAN1) 
and the ETACS-ECU connector.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-30

STEP 8. Check the CAN line between joint 
connector (CAN1) and the RV meter. 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

AC209365RQ

Harness side: C-119

Test harness

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

terminal No.7 (CAN_H) and body earth

OK: 4.0 V or less

AC209365

AC209365

AC209365

Test harness

AC209365

AC209365

AC209365RR

Harness side: C-119

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

terminal No.18 (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 ABS, ASTC and A/C> : 

<4.0 

V or less> Go to Step 22.

YES <vehicles with ABS> : 

<4.0 V or less> Go to 

Step 10.

YES <vehicles with ASTC> : 

<4.0 V or less> Go to 

Step 13.

YES <vehicles without ABS and ASTC, and with A/
C> : 

<4.0 V or less> Go to Step 20.

NO  : 

<More than 4.0 V> Go to Step 9.