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
01
Front-right wheel speed sensor
Drive the vehicle
Vehicle speeds displayed
on the speedometer and
MUT-III are identical.
02
Front-left wheel speed sensor
03
Rear-right wheel speed sensor
04
Rear-left wheel speed sensor
05
TCL/ASC-ECU power supply voltage Ignition switch power supply
voltage and valve monitor voltage
Battery positive voltage
06
Stoplamp switch
Depress the brake pedal.
ON
Release the brake pedal.
OFF
31
Lateral G
-1.7
− 1.7 G
32
Steering angle
-900
− 900 deg
33
Yaw rate
-100
− 100 deg/s
34
Master cylinder pressure
Depress the brake pedal.
−
Release the brake pedal.
nearly 0 bar
35
TCL mode
TCL switch: ON
ON
TCL switch: OFF
OFF
AC309152 AB
Activation pattern
A
B
C
Cut valve
or suction
valve
Start of
forced
action
1 s
2 s
Pump
motor
ON
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
05
FR wheel TCL Drive
Solenoid valves and
pump motors in the
hydraulic unit (simple
inspection mode)
06
FL wheel TCL Drive
07
RR wheel TCL Drive
08
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
1
Motor power supply
Ignition switch: "ON"
System voltage
Motor power supply
Ignition switch: "LOCK"(OFF)
System voltage
4
TCL/ASC-ECU
power supply
Ignition switch: "ON"
System voltage
Ignition switch: "START"
Approximately 0 V
5
G and yaw late
sensor power supply
Always
System voltage
32
Solenoid valve power
supply
Always
System voltage
38
TCL switch output
Ignition switch: "ON"
System voltage
41
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
16
− body earth
Earth
Less than 2 ohms
47
− 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
AB
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
AC
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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