Mitsubishi 380. Manual — part 330

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-40

SIGNAL

TERMINAL NO.

NORMAL CONDITION

ABS (A-02)

SENSOR

FR wheel speed sensor
(A-01)

9

2

Less than 2 ohms

10

1

Less than 2 ohms

RR wheel speed sensor
(D-30)

8

1

Less than 2 ohms

19

2

Less than 2 ohms

FL wheel speed sensor
(A-04)

16

2

Less than 2 ohms

5

1

Less than 2 ohms

RL wheel speed sensor
(D-31)

6

1

Less than 2 ohms

17

2

Less than 2 ohms

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-41

VOLTAGE AND SIGNAL CHECK AT ABS-ECU
(A-02) USING OSCILLOSCOPE

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 sup-
ply to the respective wheel speed sensor. All other
wheel speed sensors will operate normally. To
restore the power supply, the ignition switch must be
turned to the "OFF" position then to the "ON" position
again.

.

WHEEL SPEED SENSOR AIR GAP:

• Sensor air gap: (0.2mm - 0.85mm).

.

Measure supply voltage for wheel speed sensor using an
oscilloscope.
(1) ABS-ECU must remain connected.
(2) Wheel speed sensors must emain connected
(3) Remove ABS connector protection cap to access terminal

location from the rear of connector for back-probing.

(4) Using probe (MB991222) , backprobe the wheel speed

sensor voltage supply circuit terminals (16, 9, 6 and 8) at
the ABS-ECU connector (A-02) individually.

(5) Connect oscilloscope (as per figure 1) shows, to the

appropriate terminal positions and check supply voltage
individually with scope.

OSCILLOSCOPE

ABS-ECU
(A-02)

Supply

Signal

WHEEL SPEED
SENSOR

Wheel speed sensor connectors:
A-04, A-01, D-31, D-30

Terminals:
16, 9, 6, 8

FIGURE 1

Red

Black

Ground

35DB121A

11-12V

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-42

• Connect oscilloscope to FL sensor signal terminal (16)

at ABS-ECU (A-02)

• Connect oscilloscope to FR sensor signal terminal (9) at

ABS-ECU (A-02)

• Connect oscilloscope to RL sensor signal terminal (6) at

ABS-ECU (A-02)

• Connect oscilloscope to RR sensor signal terminal (8) at

ABS-ECU (A-02)

(6) Turn the ignition switch to the "ON" position.

TRACTION CONTROL SYSTEM (TCL) DIAGNOSIS

TRACTION CONTROL SYSTEM (TCL)

13C-43

(7) The recommended Supply Voltage at terminals 16, 9, 6,

and 8 are:

• Set value: 10.0Volts - 14.5Volts

Q: Is the supply voltage within the set value?

YES : Check wheel speed sensor signal at ABS-ECU using

an oscillopscope

NO :

• Refer to Power supply system

P.35B-63

• Refer to Motor supply system

P.35B-48

• Refer to Valve relay system

P.35B-56

Measure wheel speed sensor signals using an
oscilloscope.

NOTE: To check connections of the wheel speed sensors,
remove the rear seat to access the rear wheel speed sen-
sor connectors, and remove inner front guard (splash
shield) to access the front wheel speed sensors.

(1) Wheel speed sensor must remain connected to measure

active sensor.

(2) ABS-ECU must remain connected.
(3) Remove ABS connector protection cap to access terminal

location from the rear of connector for back-probing.

(4) Using probe (MB991222), backprobe the wheel speed

sensor signal circuit terminals (5, 10, 17, 19), and check
individually at the ABS-ECU connector A-02

(5) The wheel to be tested must be free to turn by hand or be

driven by brake dynamometer

(6) Connect oscilloscope (as per figure 2) shows, to the

appropriate terminal positions and check sensor operation
individually with scope.

OSCILLOSCOPE

ABS-ECU
(A-02)

Supply

Signal

WHEEL SPEED
SENSOR

Wheel speed sensor connectors:
A-04, A-01, D-30, D-31

Terminals:
5, 10, 17, 19

FIGURE 2

Red

Black

Ground

35DB122A