Mitsubishi Lancer Evolution IX. Manual — part 526

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-135

DATA LIST REFERENCE TABLE

M1352011500702

The following items can be read by the M.U.T.-II/III
from the ABS-ECU input data.

M.U.T.-II/III
display

Item
No.

Check item

Checking requirements

Normal valve

FR SNSR

11

Front-right wheel speed
sensor

Drive the vehicle

Vehicle speeds
displayed on the
speedometer
and M.U.T.-II/III
are identical.

FL SNSR

12

Front-left wheel speed
sensor

RR SNSR

13

Rear-right wheel speed
sensor

RL SNSR

14

Rear-left wheel speed
sensor

BATT.
VOLTAGE

21

ABS-ECU power supply
voltage

Ignition switch: ON

10

− 16 V

PARKING
SW

29

Parking brake switch

Pull the parking brake lever.

ON

Release the parking brake lever.

OFF

GS
(STRAIGHT)

32

Longitudinal G-sensor

When vehicle stops.

2.4

− 2.6 V

When vehicle is driven.

1.0

− 4.0 V

STOP LAMP
SW

36

Stop lamp switch

Depress the brake pedal.

ON

Release the brake pedal.

OFF

ST-N
MEMORY

37

Steering wheel sensor
neutral position learning

After driving straight at vehicle speed
over 10 km/h.

ON

Before driving with ignition switch ON.

OFF

GS
(LATERAL)

71

Lateral G-sensor

When vehicle stops.

2.4

− 2.6 V

When vehicle is driven.

1.0

− 4.0 V

ST-N

74

Steering wheel sensor
(ST-N)

Ignition switch: ON Steering: Neutral

position and fully
turned

ON

Steering: Except
for the above

OFF

ST-1

75

Steering wheel sensor
(ST-1)

Ignition switch: ON Steering: Turn

slowly.

Display ON and
OFF alternately

ST-2

76

Steering wheel sensor
(ST-2)

ST ANGLE

86

Steering degree

• Ignition switch:

ON

• Steering wheel

sensor neutral
position
learning is
finished
(service data
item No.37
displays ON).

Steering: Turn 90

°

to the right.

+ 90

°

Steering: Neutral

OFF

Steering: Turn 90

°

to the left.

- 90

°

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-136

ACTUATOR TEST REFERENCE TABLE

M1352011600709

The M.U.T.-II/III activates the following actuators for
testing.
NOTE: If the ABS-ECU runs down, actuator testing
cannot be carried out.
NOTE: Actuator testing is only possible when the
vehicle is stationary.

ACTUATOR TEST SPECIFICATIONS

CHECK AT ABS-ECU

M1352011800695

Use the following steps to remove the connector
cover of the ABS-ECU and then measure the termi-
nal voltage.

1. Move the lock lever of the ABS-ECU connector as

shown in the illustration, and then disconnect the
ABS-ECU as connector.

2. Push up and unlock the hooks of the ABS-ECU

connector as shown in the illustration, then
remove the connector cover.

AC100172 AG

Activation pattern

A

B

C

Solenoid
valve

End of
activation

Start of
activation

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

No. Item
01

Solenoid valve for
front-left wheel

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

02

Solenoid valve for
front-right wheel

03

Solenoid valve for
rear-left wheel

04

Solenoid valve for
rear-right wheel

AC211555

AB

Lock lever

AC211694

AB

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-137

TERMINAL VOLTAGE CHECK CHART

1. Measure the voltages between terminals (12)

(earth terminal) and each respective terminal.

2. The terminal layout is shown in the illustration.

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

AC211716

Terminal No.

Check item

Checking requirements

Normal condition

1

Parking brake switch Pull the parking brake lever.

1 V or less

Release the parking brake lever.

System voltage

2

M.U.T.-II/III

When the M.U.T.-II/III is connected

Serial
communication
with M.U.T.-II/III

When the M.U.T.-II/III is not connected

1 V or less

4

Steering wheel
sensor (ST-N)

Ignition
switch: "ON"

Steering wheel: Neutral
position and fully turned.

0.8

− 2.1 V

Steering wheel: Except for the
above

2.7

− 4.4 V

5

Diagnosis
changeover input

When the M.U.T.-II/III is connected

Approximately 0 V

When the M.U.T.-II/III is not connected

System voltage

10

ABS-ECU power
supply

Ignition switch: "ON"

System voltage

Ignition switch: "START" or "ACC"

Approximately 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)

Ignition
switch: "ON"

Steering wheel: Turned

Variation in the
voltage value 0.8

−

2.1 V and 2.7

− 4.4

V

19

Stop lamp monitor
input

Ignition
switch: "ON"

Stop lamp switch: "ON"

System voltage

Stop lamp switch: "OFF"

1 V or less

24

Lateral G-sensor
earth

Always

0 V

25

Longitudinal
G-sensor input

Ignition switch: "ON"

2.4

− 2.6 V

(horizontal
position)

ON-VEHICLE SERVICE

ANTI-SKID BRAKING SYSTEM (ABS)

35B-138

RESISTANCE AND CONTINUITY BETWEEN HARNESS-SIDE CONNECTOR
TERMINALS

1. Turn the ignition switch to the "LOCK" (OFF)

position and disconnect the ABS-ECU connectors
before checking resistance and continuity.

2. Check the resistance and continuity between the

terminals indicated in the table below.

3. The terminal layout is shown in the illustration.

ON-VEHICLE SERVICE

WHEEL SPEED SENSOR OUTPUT
VOLTAGE MEASUREMENT

M1352001600612

Lift up the vehicle and release the parking brake.

1. Move the lock lever of the ABS-ECU connector as

shown, and then disconnect the ABS-ECU
connector.

2. Push up and unlock the hooks of the ABS-ECU

connector as shown in the illustration, then
remove the connector cover.

26

Steering wheel
sensor (ST-1)

Ignition
switch: "ON"

Steering wheel: Turned

Variation in the
voltage value 0.8

−

2.1 V and 2.7

− 4.4

V

27

ABS-ECU warning
lamp transistor output

Ignition
switch: "ON"

When the lamp off

1 V or less

When the lamp is illuminated

7 V or more

33

Motor power supply

Always

System voltage

Terminal No.

Check item

Checking requirements

Normal condition

AC211717

ABS-ECU terminal No.

Signal

Normal condition

6

− 7

Rear-left wheel speed sensor

1.24

− 1.64 kΩ

8

− 9

Rear-right wheel speed sensor

1.24

− 1.64 kΩ

22

− 31

Front-left wheel speed sensor

1.24

− 1.64 kΩ

29

− 30

Front-right wheel speed sensor

1.24

− 1.64 kΩ

12

− body earth

Earth

Less than 2 ohms

34

− body earth

Earth

Less than 2 ohms

AC211555

AB

Lock lever

AC211694

AB