Mitsubishi Galant 9G. Manual — part 12

DIAGNOSTIC TROUBLE CODE PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-44

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the powertrain control module. On

completion, verify that the DTC is not reset.

NO : A poor connection, open circuit or other intermittent

malfunction is present in the CAN bus lines between
the powertrain control module and the ETACS-ECU
(Refer to GROUP 00, How to Cope with Intermittent
Malfunction

P.00-14

).

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the ETACS-ECU. On completion, verify that

the DTC is not reset.

NO : A poor connection, open circuit or other intermittent

malfunction is present in the CAN bus lines between
the powertrain control module and the ETACS-ECU
(Refer to GROUP 00, How to Cope with Intermittent
Malfunction

P.00-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-45

DTC 013: A/C-ECU Time-out.

CAUTION

If DTC 013 is set in the ETACS-ECU, always diag-
nose the CAN main bus line.

CAUTION

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

.

TROUBLE JUDGMENT

The ETACS-ECU receives air conditioning sys-
tem-related signal from the A/C-ECU. If an air condi-
tioning control system-related signal cannot be
received, DTC 013 will be set.

.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

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

lines between the A/C-ECU and the
ETACS-ECU, the power supply system to the
A/C-ECU, the A/C-ECU, or the ETACS-ECU may
be defective.

Past trouble

• If DTC 013 is stored as a past trouble, carry out

diagnosis with particular emphasis on wiring and
connector(s) in the CAN bus line between the
A/C-ECU and the ETACS-ECU, and the power
supply system to the A/C-ECU. For diagnosis
procedures, refer to "How to cope with past trou-
ble" (Refer to GROUP 00, How to treat past trou-
ble

P.00-16

).

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 Cope with Intermittent Mal-
function

P.00-14

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 A/C-ECU 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

DIAGNOSTIC TROUBLE CODE PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-46

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

).

STEP 2. Using scan tool MB991958, read the A/C
diagnostic trouble code.
Check if an A/C-ECU DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether A/C system-related DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the air conditioning system (Refer to

GROUP 55A, Diagnosis

P.55A-58

).

NO : Go to Step 3.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSTIC TROUBLE CODE PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-47

STEP 3. Using scan tool MB991958, read the for any
diagnostic trouble code.
Check if a DTC, which relates to CAN communication-linked
systems below, is set.

• Combination meter

A/C-related time-out DTC

• Multi center display (middle-grade type) <Vehicles with

multi center display (middle-grade type)>
A/C-related time-out DTC

(1) Turn the ignition switch to the "ON" position.
(2) Check for a DTC related to the relevant system.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the A/C-ECU. On completion, verify that the

DTC is not reset.

NO : A poor connection, open circuit or other intermittent

malfunction is present in the CAN bus lines between
the A/C-ECU and the ETACS-ECU (Refer to GROUP
00, How to Cope with Intermittent Malfunction

P.00-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827