Mitsubishi Lancer (4A9 engine). Manual — part 81
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-177
Operation pattern of items 01 to 08
AC400776
1second
2 seconds
Approx. 0.05
second
Approx. 0.01
second
AH
End
M.U.T.-III actuator test
(Item No.05, 06, 07, 08) start
End
Increase in pressure
Steady pressure
Reduction in pressure
Increase in pressure
Steady pressure
Reduction in pressure
Drive
Stop
Cut valve,
Suction valve
(TCL/ASC)
Solenoid valve
(ABS)
Pump motor
M.U.T.-III actuator test
(Item No.01, 02, 03, 04) start
CHECK AT ECU TERMINALS
M1355001700737
TERMINAL VOLTAGE CHECK
ACB01448
AB
Lock lever
Lock lever
<LHD>
<RHD>
1. Operate the lock lever to disconnect the ASC-
ECU harness connector as shown in the figure.
AC401192 AO
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
2. Connect the special tool ASC check harness
(MB991997) to measure the voltage between
each check connector terminal and the earth
terminal (No. 16 or 47).
Terminal
No.
Check item
Check condition
Normal condition
1
Motor power supply
Ignition switch: ON (OFF)
Approximately
system voltage
2
ASC-ECU power supply
Ignition switch: ON
Approximately
system voltage
Ignition switch: OFF
Approximately
system voltage
8
Ignition switch signal for ASC-
ECU activation
Ignition switch: ON
Approximately
system voltage
Ignition switch: OFF
1V or less
22
G and yaw rate sensor power
supply
Ignition switch: ON
Approximately
system voltage
32
Solenoid valve power supply
Ignition switch: ON (OFF)
Approximately
system voltage
34
Wheel speed sensor (FR) power
supply
Ignition switch: ON
Approximately
system voltage
36
Wheel speed sensor (RL) power
supply
Ignition switch: ON
Approximately
system voltage
43
Wheel speed sensor (RR) power
supply
Ignition switch: ON
Approximately
system voltage
45
Wheel speed sensor (FL) power
supply
Ignition switch: ON
Approximately
system voltage
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-178
CONTINUITY CHECK AT WIRING HARNESS-SIDE
CONNECTOR
ACB01448
AB
Lock lever
Lock lever
<LHD>
<RHD>
1. Operate the lock lever to disconnect the ASC-
ECU harness connector as shown in the figure.
AC400817 FA
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
ON-VEHICLE SERVICE
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-179
2. When performing the continuity check, turn the
ignition switch to LOCK (OFF) position, connect
the special tool ASC check harness (MB991997)
as shown in the figure, and disconnect the ASC-
ECU connector.
3. Check the continuity between terminals shown in
the chart below.
4. Terminal layout is shown in the figure.
Terminal No.
Signal
Normal condition
16
− body earth
Earth
Continuity exists (2
Ω or
less)
47
− body earth
Earth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT
CURRENT MEASUREMENT
M1355027300029
Refer to GROUP 35B
− Wheel speed sensor output
current measurement .
HYDRAULIC UNIT (HU) CHECK
M1355006100202
1. Raise the vehicle using a jack and support the
specified points with a rigid rack.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Confirm that the selector lever is in the "N"
position, and then start the engine.
4. When carrying out the actuator tests No.01 to 04,
perform the actuator tests using M.U.T.-III while
depressing the brake pedal. When carrying out
the actuator tests No.05 to 08, perform the
actuator tests using M.U.T.-III without depressing
the brake pedal. When carrying out the actuator
tests, rotate the wheel by hands to confirm that
the braking force changes.
NOTE:
.
•
While performing the actuator test, the ABS
warning lamp flashes at a rate of 2 Hz.
•
When ASC-ECU is disabled due to the fail-
safe function, the M.U.T.-III actuator test can-
not be performed.
•
After the actuator test has been performed,
the ABS warning lamp, brake waning lamp,
ASC ON indicator lamp, and ASC OFF indica-
tor lamp illuminate until the ignition switch is
turned to ON again or the communication
between M.U.T.-III and ASC-ECU is termi-
nated.
AC400780AB
M.U.T.-III actuator test
(No.01, 02, 03, 04) start
M.U.T.-III actuator test
(No.05, 06, 07, 08) start
M.U.T.-III actuator test
(No.01, 02, 03, 04)
M.U.T.-III actuator test
(No.05, 06, 07, 08)
M.U.T.-III actuator test
(No.05, 06, 07, 08)
M.U.T.-III actuator test
(No.01, 02, 03, 04)
Pedal operation
Depressed
Released
Solenoid valve position
Increase in pressure
Steady pressure
Reduction in pressure
Increase in pressure
Steady pressure
Reduction in pressure
Cut valve, suction valve
position
Checking the brake force
Checking the brake force
Lock
Drag force when the pedal is free
Approx.
1 second
Approx.
1 second
Approx.
2 seconds
Approx.
2 seconds
Approx.
3 seconds
Approx.
3 seconds
Those with a braking effort
Those without a braking effort
ON-VEHICLE SERVICE
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-180
5. This is indicated as shown in the above.
6. When any malfunction has been found, take a
necessary action according to the "Judgment
Table."
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