Mitsubishi Galant. Manual — part 530

35C-1

GROUP 35C

TRACTION

CONTROL SYSTEM

(TCL)

CONTENTS

GENERAL INFORMATION . . . . . . . .

35C-2

TRACTION CONTROL SYSTEM (TCL)
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .

35C-6

TCL Diagnostic Trouble Code Detection Conditions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35C-6

TCL DIAGNOSTIC TROUBLESHOOTING STRATEGY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35C-6

TCL TROUBLE CODE DIAGNOSIS . . . . . .

35C-7

DIAGNOSTIC TROUBLE CODE CHART . .

35C-9

SYMPTOM CHART. . . . . . . . . . . . . . . . . . .

35C-9

SYMPTOM PROCEDURES . . . . . . . . . . . .

35C-10

DATA LIST REFERENCE TABLE . . . . . . . .

35C-33

ACTUATOR TEST REFERENCE TABLE . .

35C-33

CHECK AT ABS-ECU . . . . . . . . . . . . . . . . .

35C-34

SPECIAL TOOLS . . . . . . . . . . . . . . . .

35C-36

ON-VEHICLE SERVICE . . . . . . . . . . .

35C-36

BLEEDING . . . . . . . . . . . . . . . . . . . . . . . . .

35C-36

WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT. . . . . . . . . . . . . . . . . . . . .

35C-37

HYDRAULIC UNIT CHECK . . . . . . . . . . . . .

35C-37

GENERAL INFORMATION

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

35C-2

.

G EN ER A L IN FO R M ATIO N

M1354000100029

If the throttle is opened excessively when a vehicle is
started or accelerated, the driving wheels may slip
due to excessive drive torque. This adversely affects
startability, accelerating ability or controllability. To
ensure startability, accelerating ability and
controllability, this TCL system will prevent wheel slip
by controlling (applying) brake fluid pressure to the
drive wheels to adjust the driving torque according to
road conditions. Each wheel-speed sensor detects
wheel speed and converts it to an electric signal. The

ABS-ECU determines which wheel begins to slip
according to that signal. If the ABS-ECU determines
wheel slip, it activates the solenoid valves and the
pump inside the hydraulic unit to prevent the wheel
slip by applying brake ensuring controllability. This
TCL system is controlled by the ABS-ECU, and the
TCL components are shared by the ABS system. If
the ABS hydraulic unit is faulty, the ABS-ECU must
be replaced.

CONSTRUCTION DIAGRAM

AC003603AB

9

6

7

8

1

2

3

4

5

8

4

5

9

1. HYDRAULIC UNIT (INTEGRATED

WITH ABS-ECU)

2. STOPLIGHT SWITCH
3. DATA LINK CONNECTOR
4. TCL INDICATOR LIGHT

5. TCL WARNING LIGHT
6. ABS WARNING LIGHT
7. ABS WARNING LIGHT RELAY
8. ABS ROTOR
9. WHEEL SPEED SENSOR

GENERAL INFORMATION

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TRACTION CONTROL SYSTEM (TCL)

35C-3

FLUID PRESSURE DIAGRAM

AC003739

TCL SOLEN-
OID VALVE
CONTROL

TCL SOLEN-
OID VALVE
CONTROL

WHEEL SPEED
SENSOR (FL)

FRONT LEFT
WHEEL

OUT

IN

OUT

ABS SOLEN-
OID VALVE
CONTROL

REAR LEFT
WHEEL

WHEEL SPEED SENSOR (RL)

WHEEL SPEED SENSOR (RR)

REAR RIGHT
WHEEL

PROPORTIONING
VALVE

"SELECT-LOW" CONTROL

ABS SOLENOID VALVE

ABS SOLENOID VALVE

OUT

IN

IN

RESERVOIR

RESERVOIR

ABS SOLEN-
OID VALVE
CONTROL

ABS SOLENOID
VALVE

ABS SOLENOID
VALVE

FRONT RIGHT
WHEEL

WHEEL SPEED
SENSOR (FR)

TCL SOLEN-
OID VALVE
CONTROL

TCL SOLEN-
OID VALVE
CONTROL

OUT

IN

OUT

OUT

TCL SOLENOID VALVE

TCL SOLENOID VALVE

HYDRAULIC UNIT

MASTER CYLINDER

AB

GENERAL INFORMATION

TSB Revision

TRACTION CONTROL SYSTEM (TCL)

35C-4

OPERATION OF SYSTEM

The hydraulic unit incorporates eight ABS solenoid
valves, two (IN, OUT) for each front wheel (driving
wheel).

Described below is the functioning of these
components when one of the front wheels is about to
slip.

1.When the TCL is inactive

The TCL solenoid valve (OUT) and ABS solenoid
valve (IN) are open while the TCL solenoid valve IN
and ABS solenoid valve (OUT) are closed. If the
brake pedal is depressed, the fluid pressure in the
master cylinder flows through the TCL solenoid valve
(OUT), check valve (1) and ABS solenoid valve (IN)
to the wheel cylinder, operating the brake.

If the brake pedal is released, the fluid pressure in
the master cylinder falls, and the fluid returns through
the ABS solenoid valve (IN), check valve (2) and
TCL solenoid valve (OUT) to the master cylinder,
releasing the brake.

2.When the TCL is active

(1) Pressure increasing mode
If the ABS-ECU determines that either of the front
wheels is slipping due to abrupt acceleration, etc, it
commands the TCL solenoid valve (OUT) to close
and the TCL solenoid valve to open. Furthermore, it
energizes the motor to drive the pump. The pump

then sucks out the fluid in the master cylinder
through the TCL solenoid valve (IN) and the inlet
valve, then sends it through the outlet valve (IN) to
the wheel cylinder, increasing the fluid pressure in
that cylinder.

COMPONENT

CURRENT
SUPPLY

VALVE
POSITION

COMPONENT

CURRENT
SUPPLY

VALVE
POSITION

ABS solenoid
valve

IN

OFF

Open

TCL solenoid
valve

IN

OFF

Closed

OUT

OFF

Closed

OUT

OFF

Open

AC003740

WHEN BRAKE PEDAL IS DEPRESSED

WHEN BRAKE PEDAL IS RELEASED

ABS SOLENOID
VALVE OUT

RESERVOIR

ABS SOLENOID
VALVE IN

WHEEL CYLINDER

CHECK VALVE (2)

CHECK VALVE (1)

TCL SOLENOID
VALVE OUT

MASTER CYLINDER

TCL SOLENOID
VALVE IN

PUMP AND
MOTOR
UNIT

AB

COMPONENT

CURRENT
SUPPLY

VALVE
POSITION

COMPONENT

CURRENT
SUPPLY

VALVE
POSITION

ABS solenoid
valve

IN

OFF

Open

TCL solenoid
valve

IN

ON

Open

OUT

OFF

Closed

OUT

ON

Closed