Mitsubishi Galant 9G. Manual — part 438

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

13D-20

STEP 4. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the TCL diagnostic trouble

codes. (Refer to

P.13D-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1101 set?

YES : Replace the PCM. [Refer to GROUP 13B, Power

Control Module (PCM)

P.13B-1192

]. Then go to Step

6.

NO : It can be assumed that this malfunction is intermittent.

(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-14

).

STEP 5. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the TCL diagnostic trouble

codes. (Refer to

P.13D-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1101 set?

YES : Replace the hydraulic unit (integrated with

ABS/TCL-ECU). (Refer to GROUP 35B

− Hydraulic

Unit

P.35B-105

). Then go to Step 6.

NO : It can be assumed that this malfunction is intermittent.

(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− 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

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

13D-21

STEP 6. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the TCL diagnostic trouble

codes. (Refer to

P.13D-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1101 set?

YES : Return to Step 1.
NO : The procedure is complete.

U1120 CAN Communications System TCL Uncontrollable by Engine Malfunction

CAUTION

• If DTC U1120 is set in the ABS/TCL-ECU,

always diagnose the CAN main bus line. If
there is any fault in the CAN bus lines, an
incorrect DTC may be set.

• Whenever the ABS/TCL-ECU is replaced,

ensure that the communication circuit is nor-
mal.

• The engine control system-related DTC may

be set when DTC U1120 is set. (For details
refer to GROUP 00, Intersystem Affiliated DTC
Reference Table

P.00-17

). Diagnose the

engine control system first when the engine
control system-related DTC is set.

.

DTC SET CONDITION

The ABS/TCL-ECU receives engine system-related
signals from the PCM via CAN bus lines. If a fail-safe
related data is contained in the signal from the PCM,
DTC U1120 will be stored.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THESE DTCS ARE
TO SET ARE:)

• Damaged harness or connector.

• Malfunction of the PCM.

• Malfunction of the ABS/TCL-ECU.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

13D-22

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Check for MFI system diagnostic trouble code. (Refer to

GROUP 13B, MFI Diagnosis

− Diagnostic Function − How

to Read and Erase Diagnostic Trouble Code

P.13B-6

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?

YES : Repair the MFI control system. (Refer to GROUP

13B, MFI Diagnosis

− Diagnostic Trouble Code Chart

P.13B-34

). Then go to Step 6.

NO : Go to Step 2.

STEP 2. 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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to

P.13D-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO : Repair the CAN bus lines. (Refer to GROUP 54C,

Diagnosis

− Can Bus Diagnostic Chart

P.54C-14

).

Then go to Step 6.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

13D-23

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Check if a DTC, which relates to CAN

communication-linked systems below, is set.
A/C-ECU

• DTC U1120: Failure Information on Power train con-

trol module (related to engine). (Refer to GROUP
55A, Manual A/C Diagnostic

− Diagnosis Function −

How to Read and Erase Diagnostic Trouble Code

P.55A-6

) <Vehicle with manual A/C> or (Refer to

GROUP 55B, Auto A/C Diagnosis

− Diagnostic

Function

− How to Read and Erase Diagnostic Trou-

ble Code

P.55B-4

) <Vehicle with auto A/C>.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1120 set?

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

STEP 4. Using scan tool MB991958, read the diagnostic
trouble code.

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 to the data link connector.

(Refer to

P.13D-3

).

(2) Turn the ignition switch to the "ON" position.
(3) Use scan tool MB991958 to read the TCL diagnostic trouble

codes. (Refer to

P.13D-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is DTC U1120 set?

YES : Replace the PCM. [Refer to GROUP 13B, Power

Control Module (PCM)

P.13B-1192

]. Then go to Step

6.

NO : It can be assumed that this malfunction is intermittent.

(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− 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