Mitsubishi Grandis. Manual - part 930

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-45

STEP 5. Resistance measurement at 
TCL/ASC-ECU connector A-04.

(1) Disconnect the connector A-04, and connect 

special tool ABS Check Harness (MB991997) to 
the wiring harness-side connector.
NOTE: Do not connect special tool ABS Check 
Harness (MB991997) to the TCL/ASC-ECU.

(2) Measure the resistance between terminal 47 and 

earth.

OK: 2 ohm or less

Q: Is the result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Check TCL/ASC-ECU connector A-04 for 
loose, corroded or damaged terminals, or 
terminals pushed back in the connector.

Q: Is the result normal?

YES : 

An open circuit may be present in the earth 

circuit. Repair the wiring harness between 
TCL/ASC-ECU connector A-04 terminal 47 
and the body earth. Then go to Step 8.

NO : 

Repair or replace the damaged 
component(s). Then go to Step 8.

AC312620AN

Oil reservoir

Connector: A-04

TCL/ASC-ECU

MB991997

Check connector

A-04 Harness connector

A-04

Hydraulic unit
(with built-in TCL/ASC-ECU)

AC312621

Oil reservoir

Connector: A-04

AB

A-04

Hydraulic unit
(with built-in TCL/ASC-ECU)

A-04 Harness connector
(harness side)

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-46

STEP 7. 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.C1271 set?

YES : 

Replace the hydraulic unit (integrated with 

TCL/ASC-ECU). Then go to Step 8.

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

.

STEP 8. 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.C1271 set?

YES : 

Go to Step 1.

NO : 

The procedure is complete.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-47

Code No.C1276: Valve system

OPERATION

• The TCL/ASC-ECU contains the power supply 

circuit (terminal 32) for solenoid valve. The 
solenoid valve is energized by the valve relay, 
which is incorporated in the TCL/ASC-ECU.

• The valve relay, which is incorporated in the 

TCL/ASC-ECU, is always energizing the solenoid 
valve unless the initial check is in progress when 
the ignition switch is turned on, or the recurrent 
system check is in progress.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes will be set under the cases 
below.

• The ECU monitors the power supply voltage to 

the solenoid valve. If the voltage is lower than the 
predetermined value, the ECU sets this diagnosis 
code as a failure in the valve relay circuit.

PROBABLE CAUSES

The most likely causes for these diagnosis codes to 
set are:

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

TCL/ASC-ECU)

AC313584

3

FUSIBLE 
LINK

FUSIBLE 
LINK

HYDRAULIC UNIT

SOLENOID VALVE

SOLENOID 
VALVE POWER 
SOURCE

MOTOR 
POWER SOURCE

SOLENOID
VALVE POWER
SOURCE

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

4

TCL/ASC-ECU

Solenoid Valve and Motor Power Supply Circuit

AB

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-48

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 3.

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. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(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.C1276 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824