Mitsubishi 380. Manual - part 651

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-15

DIAGNOSIS

CAN BUS DIAGNOSTICS TABLE

M1548300200055

This diagnosis applies only to the CAN bus lines. If a 
different system is defective, proceed to the applica-
ble diagnosis section for each system. Observe the 
diagnosis procedure below only when the CAN bus 
line is defective.

CAUTION

During diagnosis, a DTC code associated with 
another system may be set when the ignition 
switch is turned on with connector(s) discon-
nected. After completing the repair, confirm all 
systems for DTC code(s). If DTC code(s) are set, 
erase them all.
NOTE: all screens below appear with vehicles incor-
porating automatic transmisssion ECU, therefore 
when diagnosing can bus on vehicles with manual 
transmission (M/T), the A/T ECU will not be dis-
played on screens.

Vehicles without multi-center display 

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

<Comment>
Short circuit to battery in red displayed area is 
estimated.

Diagnostic Item 1
Diagnose shorts in the power supply to 
CAN bus line <Vehicles without 
multi-center display >

P.54C-31

16DB367A

ETACS

-ECU

AC-ECU

: Red section on screen

ENGINE 

-ECU

SRS-ECU

METER

-ECU

ABS-ECU

MUT

J/C

A/T-ECU

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-16

<Comment>
Grounding in red displayed area is 
estimated.

Diagnostic Item 3
Diagnose shorts in the ground to CAN 
bus line <Vehicles without multi-center 
display >

P.54C-134

<Comment>
Short circuit between CAN_H and CAN_L in red 
displayed area is 
estimated.

Diagnostic Item 5
Diagnose shorts between CAN_L and H 
lines <Vehicles without multi-center 
display >

P.54C-239

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

16DB367A

ETACS

-ECU

AC-ECU

: Red section on screen

ENGINE 

-ECU

SRS-ECU

METER

-ECU

ABS-ECU

MUT

J/C

A/T-ECU

16DB367A

ETACS

-ECU

AC-ECU

: Red section on screen

ENGINE 

-ECU

SRS-ECU

METER

-ECU

ABS-ECU

MUT

J/C

A/T-ECU

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-17

NOTE: If the screen other than above is displayed, 
problems are present at two or more spots. In this 
case, diagnose CAN bus lines by referring to the 
trouble spot pinpoint procedures.

NOTE: If trouble cannot be solved after performing 
the diagnosis other than item 14, diagnose CAN bus 
line thoroughly.

<Comment>
Malfunction in red displayed area is estimated. 
Please refer to service manual and inspect with 
’CAN Detail 
Diagnosis’.

Diagnostic Item 8
Diagnose CAN bus lines thoroughly 
<Vehicles without multi-center display >

P.54C-323

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

16DB367A

ETACS

-ECU

AC-ECU

: Red section on screen

ENGINE 

-ECU

SRS-ECU

METER

-ECU

ABS-ECU

MUT

J/C

A/T-ECU

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

<Comment>
Disconnection in red displayed area is 
estimated.

Diagnostic Item 6
Diagnose terminator resistors at both 
ends.

P.54C-273

16DB369A

: Red section on screen

ENGINE

-ECU

METER

-ECU

ABS-ECU

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

J/C

A/T-ECU

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-18

<Comment>
Malfunction of terminating resistance is 
estimated.

Diagnostic Item 7
Diagnose a terminator resistor at either 
end.

P.54C-301

<Comment>
Disconnection, loose connection or terminating 
resistance in red displayed area is 
estimated.

<Comment>
Disconnection, loose connection or terminating 
resistance in red displayed area is 
estimated.

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

16DB370A

: Red section on screen

ENGINE

ECU

METER

-ECU

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

ABS-ECU

J/C

A/T-ECU

16DB371A

: Red section on screen

METER

-ECU

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

ABS-ECU

J/C

A/T-ECU

ENGINE

ECU

16DB372A

: Red section on screen

METER

-ECU

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

ABS-ECU

J/C

A/T-ECU

ENGINE

ECU