Mitsubishi Grandis. Manual — part 928

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-37

CAUTION

If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Prior to this
diagnosis, diagnose the CAN bus lines.

OPERATION

• The TCL/ASC-ECU contains the power supply

circuit (terminal 32) for the 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.

• The TCL/ASC-ECU activates the solenoid valve

by turning on its driving transistor.

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes will be set under the cases
below.

• The solenoid valve is not energized even after

the TCL/ASC-ECU has turned on the driving
transistor (Open circuit is present in the power
supply circuit to the TCL/ASC-ECU solenoid
valve, or the valve relay has failed).

• The solenoid valve is not energized even after

the TCL/ASC-ECU has turned on the driving
transistor (Open circuit is present in the solenoid
valve circuit inside the TCL/ASC-ECU, or the
valve relay has failed).

• After the TCL/ASC-ECU has turned off the driving

transistor, the solenoid valve still remains
energized (short in the solenoid valve circuit).

• When a solenoid valve failure is detected

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)

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?

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.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-38

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.C1226, C1231, C1236, C1241, C1246,

C1251, C1256, C1261, C1300, C1305, C1310 or
C1315 set?

YES :

Go to Step 3.

NO :

The procedure is complete.

STEP 3. Voltage 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) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 32 and

earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC312620AL

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)

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-39

STEP 4. Check TCL/ASC-ECU connector A-04 for
loose, corroded or damaged terminals, or
terminals pushed back in the connector.

Q: Is the check result normal?

YES :

An open or short circuit may be present in

the solenoid valve power supply circuit.
Repair the wiring harness between
TCL/ASC-ECU connector A-04 terminal 32
and fusible link No.3. Then go to Step 8.

NO :

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

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 16 and

earth.

OK: 2 ohm or less

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

AC312621

Oil reservoir

Connector: A-04

AB

A-04

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

A-04 Harness connector
(harness side)

AC312620AM

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)

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-40

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 check 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 16
and the body earth. Then go to Step 8 .

NO :

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

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) Drive the vehicle at 20 km/h or more for 30

seconds or more.

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

position.

Q: Is code No.C1226, C1231, C1236, C1241, C1246,

C1251, C1256, C1261, C1300, C1305, C1310 or
C1315 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

.

AC312621

Oil reservoir

Connector: A-04

AB

A-04

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

A-04 Harness connector
(harness side)

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824