Mitsubishi 380. Manual - part 324

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-16

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

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-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.
ETACS-ECU

• DTC (U1101): A/T-ECU time-out (related to A/T). 

(Refer to GROUP 54B, SWS Diagnosis 

− General 

Description 

− Diagnostic Function − How to Read 

and Erase Diagnostic Trouble Code 

P.54B-10

).

Combination meter

• DTC (U1101): A/T-ECU time-out (related to A/T). 

(Refer to GROUP 54A, Combination Meter Assem-
bly Diagnosis 

− Diagnosis Function − How to Read 

and Erase Diagnostic Trouble Code 

P.54A-46

).

Multi-center display

• DTC (U1101): A/T-ECU time-out (related to A/T). 

(Refer to GROUP 54A, Multi-center Display 

− Diag-

nosis Function 

− How to Read and Erase Diagnostic 

Trouble Code 

P.54A-251

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC (U1101) set?

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

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-17

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

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is DTC U1101 set?

YES : Replace the Engine-ECU. [Refer to GROUP 13A, 

Engine-ECU 

P.13A-675

]. 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 diagnostic tool MB991958, read the 
diagnostic trouble code.

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic 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-93

). 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

).

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-18

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

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

trouble codes. (Refer to 

P.13C-3

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic 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.

NOTE: If the ABS-8 ECU or the active wheel 
speed sensor are disconnected, or if the wiring is 
an open/ short circuit, the ABS 8 ECU will shut 
off power supply to the respective wheel speed 
sensor. All other wheel speed sensors will oper-
ate normally. To restore the power supply, the 
ignition switch must be turned to the "OFF" posi-
tion then to the "ON" position again.

.

DTC SET CONDITION

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

• Malfunction of the ABS/TCL-ECU.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-19

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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

CAUTION

To prevent damage to diagnostic tool MB991958, always 
turn the ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting diagnostic tool 
MB991958.
(1) Connect diagnostic tool MB991958 to the data link 

connector. (Refer to 

P.13C-3

).

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

GROUP 13A, MPI Diagnosis 

− Diagnostic Function − How 

to Read and Erase Diagnostic Trouble Code 

P.13A-6

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect diagnostic tool MB991958.

Q: Is any DTC set?

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

13A, MPI Diagnosis 

− Diagnostic Trouble Code Chart 

P.13A-17

). Then go to Step 6.

NO :  Go to Step 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827