Mitsubishi L200. Manual — part 831

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-83

TROUBLE JUDGEMENT CONDITIONS
The M.U.T.-III judges the trouble when the periodi-
cally sent data from each ECU can be received nor-
mally but the resistance value between CAN_H and
CAN_L line is other than from 50

Ω to 70 Ω.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

• Malfunction of the engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Resistance measurement at C-219
ETACS-ECU connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54C-7

.

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)

(1) Remove the ETACS-ECU, and measure at the

equipment side.

AC204738

AC204738

AC204738HL

Equipment side: C-219

Test
harness

Test
harness

(2) Resistance at C-219 ETACS-ECU connector

terminal Nos.56 and 65

OK: 120

± 20 Ω

Q: Is the check result normal?

YES :

<Within 120

± 20 Ω> Go to Step 2.

NO :

<Not within 120

± 20 Ω> Replace the

ETACS-ECU.

STEP 2. Resistance measurement at C-103
engine-ECU connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54C-7

.

AC903853

BV

Connector: C-103 <LHD>

C-103 (B)

Harness side

AC903865 AY

Connector: C-103 <RHD>

Harness side

C-103 (B)

(1) Remove the engine-ECU, and measure at the

equipment side.

AC204738SK

Equipment side: C-103

Test
harness

Test
harness

(2) Resistance between C-103 engine-ECU

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-84

connector terminal Nos.108 and 109

OK: 120

± 20 Ω

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to

P.54C-7

.

Q: Is the check result normal?

YES :

<Within 120

± 20 Ω> Repair the wiring

harness between the ETACS-ECU
connector and the engine-ECU connector.

NO :

<Not within 120

± 20 Ω> Replace the

engine-ECU.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-85

Diagnosis Item 5: Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-ECU.

CAUTION

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

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-86

FUNCTION
The diagnostic result demonstrates that "the M.U.T.-
III cannot receive the sent data from the ETACS-
ECU" when the M.U.T.-III checks the periodically
sent data from each ECU.

TROUBLE JUDGEMENT CONDITIONS
M.U.T.-III judges the trouble when the periodically
sent data from ETACS-ECU cannot be received.