Mitsubishi L200. Manual - part 822

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-47

YES : 

<Both of the measurement results show 1 

k

Ω or more> Go to Step 23.

NO : 

<Either of CAN_H line or CAN_L line the 
measurement results show less than 1 k

Ω > 

Go to Step 2.

STEP 2. Check the CAN line. Resistance 
measurement at C-53 <LHD> or C-35 <RHD> 
intermediate 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

.

AC903853

Connector: C-53 <LHD>

BI

AC903865

Connector: C-35 <RHD>

AQ

(1) Disconnect the intermediate connector C-53 

<LHD> or C-35 <RHD>, and measure at its male-
side intermediate connector (at the control wiring 

harness side).

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.

AC209364ZW

Mail side: C-53 <LHD> or C-35 <RHD>

Test harness

(3) Resistance between C-53 <LHD> or C-35 

<RHD> intermediate connector terminal No.6 
(CAN_H) and body earth

OK: 1 k

Ω or more

AC209364

AC209364ZX

Mail side: C-53 <LHD> or C-35 <RHD>

Test harness

(4) Resistance between C-53 <LHD> or C-35 

<RHD> intermediate connector terminal No.7 
(CAN_L) and body earth

OK: 1 k

Ω or more

Q: Is the check result normal?

YES : 

<1 k

Ω or more> Go to Step 7.

NO : 

<Less than 1 k

Ω > Go to Step 3.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-48

STEP 3. Check the CAN line between joint 
connector (CAN2) and the engine-ECU. 
Resistance 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.

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.

AC209364

AC209364TU

Harness side: C-01

Test harness

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

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

OK: 1 k

Ω or more

AC209364

AC209364ZZ

Harness side: C-01

Test harness

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

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

OK: 1 k

Ω or more

AC209364

AC209364TV

Test harness

Harness side: C-01

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

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

OK: 1 k

Ω or more

AC209364

AC209364ZY

Test harness

Harness side: C-01

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

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

OK: 1 k

Ω or more

Q: Is the check result normal?

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-49

YES <M/T> : 

<1 k

Ω or more> 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> : 

<1 k

Ω or more> Go to Step 4.

NO  : 

<Less than 1 k

Ω > 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. Resistance 
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.

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.

AC209364

AC209364TW

Harness side: C-01

Test harness

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

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

OK: 1 k

Ω or more

AC209364

AC209364TU

Harness side: C-01

Test harness

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

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

OK: 1 k

Ω or more

AC209364

AC209364TX

Test harness

Harness side: C-01

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

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-50

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

OK: 1 k

Ω or more

AC209364

AC209364TV

Test harness

Harness side: C-01

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

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

OK: 1 k

Ω or more

Q: Is the check result normal?

YES : 

<1 k

Ω or more> 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>.

NO : 

<Less than 1 k

Ω > 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.

AC507661

: Red section on screen

AB

ETACS

DISPLAY

ABS/ASC

SAS

YR/G

A/C

IMMOBI

AT

ENGINE

J/C (2)

J/C (1)

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.