Mitsubishi L200. Manual — part 821

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White
Y : Yellow SB : Sky blue BR : Brown O : Orange GR : Grey
R : Red P : Pink V : Violet PU : Purple SI : Silver

A/T-ECU

DIAGNOSIS
CONNECTOR

ENGINE-ECU

STEERING
WHEEL
SENSOR

G AND
YAW RATE
SENSOR

A/C-ECU

ABS-ECU

ASTC-ECU

ETACS-ECU

RV METER

NOTE

:VEHICLES WITH ABS
:VEHICLES WITH ASTC
:VEHICLES WITH RV METER
:VEHICLES WITH AUTOMATIC-A/C
:LHD
:RHD
:A/T

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-43

FUNCTION
When diagnosing the CAN bus lines, the M.U.T.-III
measures the voltage of CAN_H and CAN_L line and
detects the short to power supply or earth.

TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble when it is impossi-
ble to receive the periodically sent data and the volt-
age of CAN_H or CAN_L line is less than 1.0 V.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-44

TROUBLESHOOTING HINTS

• Malfunction of the wiring harness

• Malfunction of the connector

• Malfunction of each ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-45

DIAGNOSIS PROCEDURE

STEP 1. Check the CAN bus lines. Resistance
measurement at C-22 diagnosis 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

.

NOTE: This inspection allows you to check that there
is a short to earth in either CAN_H line or CAN_L
line. Thus, in the following steps, check the CAN bus
line that is defective.

AC903856BQ

Connector: C-22 <LHD>

C-22 (B)

Harness side
(Front side)

AC903868

CK

C-22 (B)

Connector: C-22 <RHD>

Harness side
(Front side)

AC903853

BV

Connector: C-103 <LHD>

C-103 (B)

Harness side

AC903865 AY

Connector: C-103 <RHD>

Harness side

C-103 (B)

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)

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-46

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

ETACS-ECU connector C-219, and measure the
resistance at harness side of diagnosis connector
C-22.

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.

AC209364RJ

Harness side: C-22

Test
harness

(3) Resistance between C-22 diagnosis connector

terminal No.6 (CAN_H) and body earth

OK: 1 k

Ω or more

AC209364

Harness side: C-22

Test
harness

AC209364RK

(4) Resistance between C-22 diagnosis connector

terminal No.14 (CAN_L) and body earth

OK: 1 k

Ω or more

Q: Is the check result normal?