Mitsubishi Grandis. Manual - part 945

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-105

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(1) Connect MUT-III to the 16-pin diagnosis 

connector.

(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 check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, CAN bus line Diagnostic flow 

P.54D-9

). Then go to Step 2.

STEP 2. MUT-III diagnosis code

Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.U1073 set?

YES : 

Replace the hydraulic unit (integrated with 

TCL/ASC - ECU). Then go to Step 3  .

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.00-5

.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-106

STEP 3. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.

(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is code No.U1073 set?

YES : 

Go to Step 1.

NO : 

The procedure is complete.

Code No. U1100 CAN communications system time out error engine related data

CAUTION

• If diagnosis code No.U1100 is set in the 

TCL/ASC-ECU, always diagnose the CAN 
main bus line. If there is any fault in the CAN 
bus lines, an incorrect diagnosis code may be 
set.

• Whenever the ECU is replaced, ensure that 

the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS

The TCL-ASC-ECU receives engine system-related 
signals from the Engine-ECU <M/T> or 
Engine-A/T-ECU <A/T> via CAN bus lines.

PROBABLE CAUSES

• Damaged harness or connector.

• Malfunction of the Engine-ECU <M/T> or 

Engine-A/T-ECU <A/T> .

• Malfunction of the TCL/ASC-ECU.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-107

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

CAUTION

To prevent damage to MUT-III, always turn the 
ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector 

as shown in the illustration.

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

54D, CAN bus line Diagnostic flow 

P.54D-9

).

(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

(5) Disconnect MUT-III.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, CAN bus line Diagnostic flow 

P.54D-9

). Then go to Step 6 .

STEP 2. MUT-III diagnosis code

CAUTION

To prevent damage to MUT-III, always turn the 
ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector 

as shown in the illustration.

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

GROUP 13A, MPI Diagnosis - How to Read and 
Erase Diagnosis Code 

P.13A-11

).

(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

(5) Disconnect MUT-III.

Q: Is any diagnosis code set?

YES : 

Repair the MPI control system. (Refer to 

GROUP 13A, MPI Diagnosis 

− Diagnosis 

Code Chart 

P.13A-20

). Then go to Step 6 .

NO : 

Go to Step 3 .

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-108

STEP 3. MUT-III diagnosis code

CAUTION

To prevent damage to MUT-III, always turn the 
ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector 

as shown in the illustration.

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

communication-linked systems below, is set.
Combination meter

• Code No.011: Power train control module 

time-out (related to engine)

A/C-ECU

• Code No.U1100: Power train control module 

time-out (related to engine)

(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

(5) Disconnect MUT-III.

Q: Is code No.011 or U1100 set?

YES : 

Go to Step 4 .

NO : 

Go to Step 5 .

STEP 4. Check whether the diagnosis code is 
reset.

Check again if the diagnosis code is set.

CAUTION

To prevent damage to MUT-III, always turn the 
ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting MUT-III.
(1) Connect the MUT-III to the diagnosis connector 

as shown in the illustration.

(2) Turn the ignition switch to the "ON" position.
(3) Erase the diagnosis code.
(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

(5) Turn the ignition switch to the "ON" position.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF) 

position.

(8) Disconnect MUT-III.

Q: Is code No.U1100 set?

YES : 

Replace the Engine-ECU <M/T> or 

Engine-A/T-ECU <A/T> (Refer to GROUP 
13A, Engine-ECU and Engine-A/T-ECU 

P.13A-399

). 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.00-5

.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824