Mitsubishi Grandis. Manual - part 143

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-34

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 power supply and earth lines to the 
ETACS-ECU and the column switch (column-ECU) 
and the SWS communication lines are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• Column ECU

• ETACS ECU

OK: "OK" is displayed for all the items

Q: Are the check result normal?

Normal conditions are displayed for all the items. : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

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

."

Diagnosis code No.03 Communication error with front-ECU

CAUTION

If diagnosis code No.03 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

TROUBLE JUDGMENT

The ETACS-ECU communicates with the front-ECU 
through the SWS communication line. If there is any 
trouble in that communication, diagnosis code No.03 
will be set.

COMMENTS ON TROUBLE SYMPTOM

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

POSSIBLE CAUSES

• Malfunction of the front-ECU

• 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?

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 power supply and earth lines to the 
ETACS-ECU and the front-ECU and the SWS 
communication lines are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• Front ECU

• ETACS ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-35

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 "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 "ETACS ECU" menu. : 

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

P.54C-63

."

Diagnosis code No.04  Communication error with sunroof-ECU

CAUTION

If diagnosis code No.04 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

TROUBLE JUDGMENT

The ETACS-ECU communicates with the sunroof 
motor assembly (sunroof-ECU) through the SWS 
communication line. If there is any trouble in that 
communication, diagnosis code No.04 will be set.
NOTE: For vehicles without sunroof, diagnosis code 
No.04 does not mean that there is a problem.

COMMENTS ON TROUBLE SYMPTOM

The sunroof motor assembly (sunroof-ECU), the 
ETACS-ECU, connector(s), or wiring harness 
between the two may be defective.

POSSIBLE CAUSES

• Malfunction of the sunroof motor assembly 

(sunroof-ECU)

• 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?

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 power supply and earth lines to the 
ETACS-ECU and the sunroof motor assembly 
(sunroof-ECU) and the SWS communication lines 
are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• Sunroof ECU

• ETACS ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-36

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 "SUNROOF ECU" menu. : 

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

P.54C-90

."

"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

."

Diagnosis code No.05 Communication error with power window main switch

CAUTION

If diagnosis code No.05 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

TROUBLE JUDGMENT

The ETACS-ECU communicates with the power 
window main switch through the SWS 
communication lines. If there is any trouble in that 
communication, diagnosis code No.05 will be set.

COMMENTS ON TROUBLE SYMPTOM

If the power window main switch, the ETACS-ECU or 
the CAN bus line fails, this diagnosis code will be set.

POSSIBLE CAUSES

• Malfunction of the power window main switch

• Malfunction of the ETACS-ECU switch

• Malfunction of the CAN bus

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 diagnosis code set?

YES : 

Go to Step 3.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

Step 3. ECU check by using the SWS monitor
Check that the power supply and earth lines to the 
ETACS-ECU and the power window main switch 
(power window module) and the SWS 
communication lines are normal.

• Ignition switch: ON

ECUS TO BE CHECKED

• P/W MODULE

• ETACS 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 "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 "ETACS ECU" menu. : 

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

P.54C-63

."

DIAGNOSTIC TROUBLE CODE PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-37

Diagnosis code No.10 Bus off

CAUTION

If diagnosis code No.10 is set in the ETACS-ECU, 
diagnose the CAN bus lines.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

TROUBLE JUDGMENT

Diagnosis code No.10 will be stored when the 
ETACS-ECU ceases CAN communication (bus off) 
and then resumes the communication by turning the 
ignition switch to the "LOCK" (OFF) position.

COMMENTS 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 SWS 
communication lines may be defective.

POSSIBLE CAUSES

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

). On completion, 

go to Step 3.

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

not reset.

Q: Is the check result normal?

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 : 

Replace the ETACS-ECU, and then go to 
Step 3.

Step 3. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position to ON
(3) Check if the diagnosis code is set.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Return to Step 1.

Diagnosis code No.11 Engine-A/T-ECU time-out (related to engine)

CAUTION

If diagnosis code No.11 is set in the ETACS, 
diagnose the CAN main bus line.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

• The ETACS-ECU receives engine and 

transmission control signals from the 
engine-A/T-ECU <A/T> or the engine-ECU 
<M/T> through the CAN bus lines. If the ECU can 
not receive the engine control system-related 
signal at all, diagnosis code No.11 will be set.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the ETACS-ECU and the 
engine-A/T-ECU <A/T> or the engine-ECU 
<M/T>, the power supply circuits to these ECUs, 
or the ETACS-ECU itself may be defective.

Past trouble

• If diagnosis code No.11 is set as past trouble, 

carry out diagnosis with particular emphasis on 
wiring and connector(s) in the CAN bus lines 
between the ETACS-ECU and the 
engine-A/T-ECU <A/T> or the engine-ECU 
<M/T>, or power supply to the engine-A/T-ECU