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.