Mitsubishi Grandis. Manual - part 142

DIAGNOSIS CODE CHART

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-30

SWITCHES WHICH ARE APPLICABLE TO 
INPUT SIGNAL CHECK, AND THEIR 
CHECK CONDITIONS

MUT-III DRIVE RECORDER FUNCTION

M1549026000064

1. The SWS monitor cartridge memory can store the 

ECU check results, the service data, the 
communication data obtained by the function 
diagnosis. This communication data can be 
displayed as a chart or graphical form.

2. If data obtained by the drive recorder function has 

to be stored for long time, the data can be 
transferred to the SWS monitor cartridge. By 
doing this, you can disconnect the MUT-III to 
prevent excessive battery drain.
NOTE: For the details about the MUT-III drive 
recorder function, refer to MUT-III User’s Manual.

DIAGNOSIS CODE CHART

M1549000700364

NOTE: 

.

•

*1

: For vehicles without sunroof, diagnosis code No.4 does not mean that there is a problem.

•

*2

: For M/T-vehicles, diagnosis code No.12 does not mean that there is a problem.

•

*3

: Diagnosis code No.15 does not mean that there is a problem.

Input signal

Requirements for sounding buzzer

Inhibitor switch ("R" position)

When the ignition switch is turned ON and 
the selector lever is moved to the R position.

Diagnosis code No.

Diagnostic item

Reference page

01

Trouble in SWS communication line system or 
ETACS-ECU

 

P.54C-31

02

Communication error with column switch

 

P.54C-33

03

Communication error with front-ECU

 

P.54C-34

04

*1

Communication error with sunroof-ECU

 

P.54C-35

05

Communication error with power window main switch

 

P.54C-36

10

Bus off

 

P.54C-37

11

Engine-A/T-ECU time-out (related to engine)

 

P.54C-37

12

*2

Engine-A/T-ECU time-out (related to A/T)

 

P.54C-39

13

A/C-ECU time-out

 

P.54C-40

14

Meter time-out

 

P.54C-41

15

*3

Centre display unit time-out

−

21

Meter failure information

 

P.54C-42

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-31

DIAGNOSTIC TROUBLE CODE PROCEDURES

Diagnosis code No.01 Trouble in SWS communication line system or ETACS-ECU

CAUTION

If diagnosis code No.01 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

ETACS-ECU

COLUMN
SWITCH

FRONT-ECU

SUNROOF
MOTOR
ASSEMBLY

POWER
WINDOW
MAIN SWITCH

COLUMN-ECU

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

CPU

CPU

SWS Communication Line <LHD>

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-32

TROUBLE JUDGMENT

The ETACS-ECU communicates with the column 
switch, the front-ECU, the sunroof motor assembly 
and the power window main switch through the SWS 
communication line. If there is any trouble in the 
ETACS-ECU or the SWS communication lines, 
diagnosis code No.01 will be set.

COMMENT ON TROUBLE SYMPTOM

The wiring harness wire or connectors may have 
loose, corroded, or damage terminals, or terminals 
pushed back in the connector, or the ETACS-ECU 
may be defective.

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-16

).

Step 2. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Ignition switch: LOCK (OFF) position to ON
(2) Erase the diagnosis code.
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?

ETACS-ECU

COLUMN
SWITCH

FRONT-ECU

POWER
WINDOW
MAIN SWITCH

SUNROOF
MOTOR
ASSEMBLY

CPU

CPU

COLUMN-ECU

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

SWS Communication Line <RHD>

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-33

YES : 

If a trouble is solved, it is determined that 

there is an intermittent malfunction such as 
poor engaged connector(s) or open circuit 
(Refer to GROUP 00 

− How to use 

troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 3.

Step 3. ECU check by using the SWS monitor

Check that the SWS communication lines are in 
good condition.

• Ignition switch: ON

ECUS TO BE CHECKED

• Column ECU

• ETACS ECU

• Front ECU

• P/W MODULE

• Sunroof-ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

Normal conditions are displayed for all the items. : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-56

."

"NG" is displayed on the "ETACS ECU" menu. : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-63

."

"NG" is displayed on the "FRONT ECU" menu. : 

Refer to Inspection Procedure A-4 
"Communication with the front-ECU is not 
possible 

P.54C-70

."

"NG" is displayed on the "P/W MODULE" menu. : 

Refer to Inspection Procedure A-5 
"Communication with the power window 
main switch (power window module) is not 
possible 

P.54C-77

."

"NG" is displayed on the "Sunroof ECU" menu. : 

Refer to Inspection Procedure A-6 
"Communication with the sunroof motor 
assembly (sunroof-ECU) is not possible 

P.54C-90

."

Diagnosis code No.02 Communication error with column switch

CAUTION

If diagnosis code No.02 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

TROUBLE JUDGMENT

The ETACS-ECU communicates with the column 
switch through the SWS communication lines. If 
there is any trouble in that communication, diagnosis 
code No.02 will be set.

COMMENT ON TROUBLE SYMPTOM

The column switch, the ETACS-ECU, connector(s), 
or wiring harness between the two may be defective.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. MUT-III CAN bus diagnostics

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-16

).

Step 2.Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is 

not reset.

Q: Is the check result normal?