Mitsubishi Lancer Evolution 7. Manual — part 321
ABS <4WD> -
Troubleshooting
35B-23
ACTUATOR TEST REFERENCE TABLE
The MUT-II activates the following actuators for testing.
NOTE
1. If the ABS-ECU runs down, actuator testing cannot be carried out.
2. Actuator testing is only possible when the vehicle is stationary.
ACTUATOR TEST SPECIFICATIONS
Item
No.
Checking item
Activation
01
Solenoid valve for front-right
wheel
Solenoid valves and
pump motors in the
h d
li
it ( i
l
02
Solenoid valve for front-left
wheel
p
p
hydraulic unit (simple
inspection mode)
03
Solenoid valve for rear-right
wheel
04
Solenoid valve for rear-left
wheel
05
ABS signal
ABS signal (voltage:
less than 1.0V) is
output for 10 seconds
2s
1s
0.05 s
0.01 s
Activation pattern of Items No. 01 - 04
Solenoid
valve
Pump
motor
ON
OFF
Start of
forced action End of forced
action
A
B
C
NOTE
A: Hydraulic pressure increase
B: Hydraulic pressure holds
C: Hydraulic pressure decrease
ABS <4WD> -
Troubleshooting
35B-24
CHECK AT ABS-ECU
Use the following steps to remove the connector cover and
measure the terminal voltage.
1. Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the ABS-ECU
connector.
2. Push up and unlock the hooks of the ABS-ECU connector
shown in the illustration, then remove the connector cover.
TERMINAL VOLTAGE CHECK CHART
1. Measure the voltage between each terminal and earth
(terminal No.12).
2. The terminal layout is shown in the illustration.
Terminal No.
Check item
Checking requirements
Normal condition
1
Parking brake switch
input
Parking brake switch: ON
1 V or less
input
Parking brake switch: OFF
System voltage
2
MUT-II
When the MUT-II is connected
Serial communication with MUT-II
When the MUT-II is not connected
1 V or less
3
ABS ON output to
4WD ECU
With ABS active (reference)
(0.5 V or less)
4WD-ECU
With ABS not active
System voltage
4
Steering wheel sensor
(ST-N) input
Ignition
switch: ON
Steering wheel: Neutral
position and position
near by ± 360_
0.8 - 2.1 V
Steering wheel: Except
for above
2.7 - 4.4 V
5
Diagnosis changeover
input
When the MUT-II is connected
0 V
input
When the MUT-II is not connected
Approx. 12 V
Lock lever
ABS <4WD> -
Troubleshooting
35B-25
Terminal No.
Normal condition
Checking requirements
Check item
10
ABS-ECU power
supply
Ignition switch: ON
System voltage
supply
Ignition switch: START or ACC
0 V
11
Solenoid valve power
supply
Always
System voltage
14
Lateral G sensor input
Ignition switch: ON
2.4 - 2.6 V (horizontal position)
15
Longitudinal G sensor
earth
Always
0 V
17
Steering wheel sensor
(ST-2) input
Ignition
switch: ON
Steering wheel: Turn
laterally
Variation in the voltage value 0.8 -
2.1 V and 2.7 - 4.4 V
18
Wheel speed sensor
(front right) output
Moving forward slowly
0 - 5 V
19
Stop lamp monitor
input
Ignition
switch: ON
Stop lamp switch: ON
System voltage
input
switch: ON
Stop lamp switch: OFF
1 V or less
20
Wheel speed sensor
(rear left) output
Moving forward slowly
0 - 5 V
21
Wheel speed sensor
(rear right) output
Moving forward slowly
0 - 5 V
24
Lateral G sensor earth
Always
0 V
25
Longitudinal G sensor
input
Ignition switch: ON
2.4 - 2.6 V (horizontal position)
26
Steering wheel sensor
(ST-1) input
Ignition
switch: ON
Steering wheel: Turn
laterally
Variation in the voltage value 0.8 -
2.1 V and 2.7 - 4.4 V
27
ABS warning lamp
transistor output
Ignition
switch: ON
When the lamp is
switched off
1 V or less
When the lamp is
illuminated
7 V or more
32
Wheel speed sensor
(front left) output
Moving forward slowly
0 - 5 V
33
Motor power supply
Always
System voltage
ABS <4WD> -
Troubleshooting/On-vehicle Service
35B-26
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
1. Turn the ignition key to the “LOCK” (OFF) position.
2. Disconnect the ABS-ECU connector.
3. Check the resistance and continuity between the terminals
indicated in the table below.
4. The terminal layout is shown in the illustration.
ABS-ECU terminal No.
Signal
Normal condition
6 - 7
Wheel speed sensor (rear left)
1.24 - 1.64 kΩ
8 - 9
Wheel speed sensor (rear right)
22 - 31
Wheel speed sensor (front left)
29 - 30
Wheel speed sensor (front right)
12 - Body earth
Earth
Continuity
34 - Body earth
Earth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
1. Lift up the vehicle and release the parking brake.
2. Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the ABS-ECU
connector.
3. Push up and unlock the hooks of the ABS-ECU connector
shown in the illustration, then remove the connector cover.
Lock lever
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