Mitsubishi L200. Manual - part 826

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-63

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 ETACS-ECU connector, and 
repair if necessary. If the ETACS-ECU 
connector is in good condition, go to Step 
26.

STEP 26. 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 ETACS-ECU connector, and 
repair if necessary. If the ETACS-ECU 
connector is in good condition, replace the 
ETACS-ECU.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-64

Diagnosis Item 3: Diagnose shorts between CAN_H and L lines

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-65

FUNCTION
The M.U.T.-III judges a short between CAN_H and 
CAN_L line when all data from ECU cannot be 
received while checking periodically sent data from 
each ECU even if the voltage is normal.

TROUBLE JUDGEMENT CONDITIONS
Short circuit may be present between the CAN_L 
and H lines when the resistance between the CAN 
bus lines (CAN_L and H lines) is less than 2 

Ω.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-66

TROUBLESHOOTING HINTS

• Malfunction of the wiring harness

NOTE: The M.U.T.-III cannot receive all the periodi-

cally sent data from each ECU by the open circuit 
of harness between the diagnosis connector, the 
joint connector (CAN1) and the joint connector 
(CAN2). In addition, the M.U.T.-III measures the 
voltage itself and shows 2.5 V due to the open 
circuit of harness. Therefore, it is judged as a 
short between CAN_H and CAN_L line.

• Malfunction of the connector

• Malfunction of each ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-53 <LHD> or C-35 
<RHD> intermediate connector

AC903853

Connector: C-53 <LHD>

BI

AC903865

Connector: C-35 <RHD>

AQ

CAUTION

The strand end of the twist wire should be within 
10 cm from the connector. For details refer to 

P.54C-7

.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. 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 connector, and measure at its 

female-side intermediate connector (at the 
instrument panel wiring harness side).

(2) Turn the ignition switch to the LOCK (OFF) 

position.

CAUTION

When measuring the resistance, disconnect the 
negative battery terminal. For details refer to 

P.54C-7

.

(3) Ensure that the negative battery terminal is 

disconnected.

AC204738SG

Test harness

Test harness

Female side: C-53 <LHD> or C-35 <RHD>

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