Mitsubishi Galant (2004+). Manual — part 212

DIAGNOSTIC TROUBLE CODE PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-39

STEP 3. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.

Check the following ECUs:

• Sunroof-ECU

• ETACS-ECU

CAUTION

Connect special tool MB991910 before connecting special
tool MB991812. Be sure to connect special tool MB991806
after turning on special tool MB991824.
(1) Connect the SWS monitor. Refer to "How to connect SWS

monitor

P.54B-13

."

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure

below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

(4) Scan tool MB991958 should show "OK" on the "ECU

COMM Check" menus for both the "SUNROOF ECU" and
the "ETACS ECU" menus.

Q: Is "OK" displayed for both the "SUNROOF ECU" and

"ETACS ECU" menus?
"OK" is displayed for all the items : It is determined that

there is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-6

).

"NG" is displayed for the "SUNROOF ECU" menu :

Refer to Inspection Procedure A-5

P.54B-94

.

"NG" is displayed for the "ETACS ECU" menu : Refer to

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

P.54B-79

."

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

AB

DIAGNOSTIC TROUBLE CODE PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-40

DTC 010: Bus Off

CAUTION

If DTC 010 is set in the ETACS-ECU, always diag-
nose the CAN main bus line.

CAUTION

If the DTC is set as past trouble, the ECU cannot
be defective. Do not replace it.

.

TROUBLE JUDGMENT
DTC 010 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

.

TECHNICAL DESCRIPTION (COMMENT)
Carry out diagnosis with particular emphasis on wir-
ing and connector(s) in the CAN bus lines. For diag-
nosis procedures, refer to "How to cope with past
trouble" (Refer to GROUP 00, How to Use Trouble-
shooting/Inspection Service Points

P.00-6

).

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect

SWS monitor

P.54B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-41

STEP 2. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU. After replacement, check

that the DTC is not reset.

NO : There is an intermittent malfunction such as poor

engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction

P.00-6

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-42

DTC 011: Powertrain Control Module Time-out (Related to Engine)
DTC 012: Powertrain Control Module Time-out (Related to A/T)

CAUTION

If DTC 011 or 012 is set in the ETACS-ECU,
always diagnose the CAN main bus line.

CAUTION

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

.

TROUBLE JUDGMENT

DTC 011

• The ETACS-ECU receives engine control sys-

tem-related signal from the powertrain control
module. If the ECU cannot receive the signal,
DTC 011 will be set.

DTC 012

• The ETACS-ECU receives automatic transaxle

control system-related signal from the powertrain
control module. If automatic transaxle control
system-related signal cannot be received, DTC
012 will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

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

lines between the powertrain control module and
the ETACS-ECU, the power supply system to the
powertrain control module, the powertrain control
module itself, or the ETACS-ECU may be defec-
tive.

Past trouble

• If DTC 011 or 012 is stored as a past trouble,

carry out diagnosis with particular emphasis on
wiring and connector(s) in the CAN bus line
between the ETACS-ECU and the powertrain
control module, and the power supply system to
the powertrain control module. For diagnosis pro-
cedures, refer to "How to cope with past trouble"
(Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points

P.00-6

).

NOTE: You cannot find a past trouble, by the
MUT-III CAN bus diagnostics even if there is a
failure in CAN bus lines. In this case, refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points-How to Cope with Intermittent
Malfunction

P.00-6

and check the CAN bus lines.

You can narrow down the possible cause of the
trouble by referring to the DTC, which is set
regarding the CAN communication-linked ECUs
(Refer to GROUP 54C, CAN Bus Line Diagnostic
Flow

P.54C-6

).

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector.

• The powertrain control module may be defective.

• The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A