Mitsubishi Grandis. Manual - part 958

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-157

ACTUATOR TEST REFERENCE TABLE

M1355001600020

The MUT-III activates the following actuators for
testing.
NOTE: If the TCL/ASC-ECU runs down, actuator
testing cannot be carried out.
NOTE: Actuator testing is only possible when the
vehicle is stationary.

ACTUATOR TEST SPECIFICATIONS

Item
No.

Check item

Checking requirements

Normal valve

Front-right wheel speed sensor

Drive the vehicle

Vehicle speeds displayed
on the speedometer and
MUT-III are identical.

Front-left wheel speed sensor

Rear-right wheel speed sensor

Rear-left wheel speed sensor

TCL/ASC-ECU power supply voltage Ignition switch power supply

voltage and valve monitor voltage

Battery positive voltage

Stoplamp switch

Depress the brake pedal.

Release the brake pedal.

OFF

Lateral G

-1.7

− 1.7 G

Steering angle

-900

− 900 deg

Yaw rate

-100

− 100 deg/s

Master cylinder pressure

Depress the brake pedal.

−

Release the brake pedal.

nearly 0 bar

TCL mode

TCL switch: ON

TCL switch: OFF

OFF

AC309152 AB

Activation pattern

Cut valve
or suction
valve

Start of
forced
action

1 s

2 s

Pump
motor

OFF

Note
A:
B:
C:

Hydraulic pressure increases
Hydraulic pressure holds
Hydraulic pressure decreases

0.01 s

0.05 s

End of
forced
action

No.

Item

Parts to be activated

FR wheel TCL Drive

Solenoid valves and
pump motors in the
hydraulic unit (simple
inspection mode)

FL wheel TCL Drive

RR wheel TCL Drive

RL wheel TCL Drive

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-158

CHECK AT ABS-ECU

M1355001700027

TERMINAL VOLTAGE CHECK CHART

1. Disconnect the TCL/ASC-ECU connector A-04,

and then use special tool MB991997 to measure
the voltages between terminals (16) and each
terminal other than terminal (47) as well as
between terminal (47) and each terminal other
than terminal (16).

2. The terminal layouts are shown in the illustrations

below.

NOTE: Do not measure terminal voltage for
approximately three seconds after the ignition switch
is turned "ON." The TCL/ASC-ECU performs the
initial check during that period.

AC312620AE

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)

Terminal No.

Check item

Checking requirements

Normal condition

Motor power supply

Ignition switch: "ON"

System voltage

Motor power supply

Ignition switch: "LOCK"(OFF)

System voltage

TCL/ASC-ECU
power supply

Ignition switch: "ON"

System voltage

Ignition switch: "START"

Approximately 0 V

G and yaw late
sensor power supply

Always

System voltage

Solenoid valve power
supply

Always

System voltage

TCL switch output

Ignition switch: "ON"

System voltage

Stop lamp switch
input

Ignition
switch: "ON"

Stop lamp switch: "ON"

System voltage

Stop lamp switch: "OFF"

Approximately 0 V

ON-VEHICLE SERVICE

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-159

RESISTANCE AND CONTINUITY
BETWEEN HARNESS-SIDE CONNECTOR
TERMINALS

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 and continuity between

the terminals indicated in the table below.

ON-VEHICLE SERVICE

HYDRAULIC UNIT CHECK

M1355006100020

CAUTION

• The roller of the braking force tester and the

tyre should be dry during testing.

• When testing the front brakes, apply the

parking brake. When testing the rear brakes,
stop the front wheels with chocks.

1. Jack up the vehicle. Then support the vehicle with

rigid racks at the specified jack-up points or place
the front or rear wheels on the rollers of the
braking force tester.

2. Release the parking brake, and feel the drag force

(drag torque) on each road wheel. When using
the braking force tester, take a reading of the
brake drag force.

AC312620AF

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)

Terminal No.

Signal

Normal condition

− body earth

Earth

Less than 2 ohms

− body earth

Earth

Less than 2 ohms

ON-VEHICLE SERVICE

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-160

CAUTION

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

connector.

4. After checking that the selector lever is in "P"

range, start the engine.

5. Select "Interactive Diagnosis" from the start-up

screen.

6. Select "System Select."
7. Choose "ABS/ASC/ASTC" from the "CHASSIS"

tab.

8. Select "Actuator Test" from "ABS/ASC/ASTC"

screen

9. Choose an appropriate item for hydraulic unit

check.
NOTE: The TCL/ASC system will switch to the
MUT-III mode and the ABS warning lamp,
TCL/ASC indicator and TCL OFF indicator will
illuminates.
NOTE: When the ABS and TCL/ASC has been
interrupted by the fail-safe function, MUT-III
actuator testing cannot be used.

AC302297

AC310120

MB991827

16-pin

MB991910

MB991824

AC309090

Depressed

Released

Pressure increase

Pressure decrease

Pressure hold

Lock

Drag force when the
pedal is free

Pedal
operation

Solenoid
valve
position

Checking
the brake
force

Cut valve and
suction valve
position

MUT-III actuator test
(Item No.01, 02, 03, 04) start

1 s

2 s

3 s

MUT-III actuator test
(Item No.05, 06, 07, 08) start

2 s

1 s

Pressure increase

Pressure decrease

Pressure hold

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