Mitsubishi Outlander (2003+). Manual — part 278

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-55

INSPECTION PROCEDURE 4: Faulty ABS Operation

COMMENT ON TROUBLE SYMPTOM
The cause depends on driving and road surface
conditions, so diagnosis may be difficult. However, if
no diagnosis code is set, carry out the following
inspection.

PROBABLE CAUSES
The most likely cause for this case is:

•

Malfunction of the hydraulic unit

DIAGNOSIS
Check the hydraulic unit (Refer to

P.35B-61

). If the

hydraulic unit (integrated with ABS-ECU) is
malfunctioning, replace it. Then check that the
malfunction symptom is eliminated.

DATA LIST REFERENCE TABLE

M1352011500661

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

When the system is normal.

When the ABS-ECU shut off ABS operation.
When the diagnosis system stops the ABS-ECU, the
MUT-II/III display data will be unreliable.

Item
No.

Check item

Checking requirements

Normal valve

11

Front-right ABS sensor

Perform a test run

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

12

Front-left ABS sensor

13

Rear-right ABS sensor

14

Rear-left ABS sensor

21

ABS-ECU power supply voltage

Ignition switch: ON

10

−

16 V

32

G-sensor <4WD>

•

Ignition switch: ON

•

When vehicle is parked on a level
surface.

2.4

−

2.6 V

When vehicle is accelerated

4.0

−

1.0 V

When vehicle is decelerated

1.0

−

4.0 V

36

Stop lamp switch

Depress the brake pedal.

ON

Release the brake pedal.

OFF

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-56

ACTUATOR TEST REFERENCE TABLE

M1352011600679

The MUT-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

M1352011800640

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.

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

AC200022

AE

Lock lever

AC103604AC

ABS-ECU connector

Connector cover

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-57

TERMINAL VOLTAGE CHECK CHART

1. Measure the voltages between earth terminal (2)

or (18) and each respective terminal.

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 to the "ON" position. The ABS-ECU
performs the initial check during that period.

AC300659

Terminal No. Check item

Checking requirements

Normal condition

1

Solenoid valve power
supply

Always

System voltage

3

Stop lamp switch input Stop lamp switch: "ON"

System voltage

Stop lamp switch: "OFF"

Approximately 0 V

4

Diagnosis changeover
input

When the MUT-II/III is connected

Approximately 0 V

When the MUT-II/III is not connected

System voltage

8

G-sensor earth
<4WD>

Always

Approximately 0 V

12

ABS-ECU warning
lamp transistor output

Ignition
switch: "ON"

When the lamp is switched off

Approximately 0 V

When the lamp is illuminated

System voltage

13

MUT-II/III

When the MUT-II/III is connected

Serial
communication with
MUT-II/III

When the MUT-II/III is not connected

Approximately 0 V

15

G-sensor input
<4WD>

•

Ignition switch: "ON"

•

Horizontal state of vehicle

2.4

−

2.6 V

19

Motor power supply

Always

System voltage

20

ABS-ECU power
supply

Ignition switch: "ON"

System voltage

Ignition switch: "START"

Approximately 0 V

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-58

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.

AC300662

ABS-ECU terminal No.

Signal

Normal condition

9

−

10

Front-right ABS sensor

1.24

−

1.64 k

Ω

11

−

17

Rear-right ABS sensor

1.24

−

1.64 k

Ω

16

−

26

Front-left ABS sensor

1.24

−

1.64 k

Ω

27

−

28

Rear-left ABS sensor

1.24

−

1.64 k

Ω

2

−

body earth

Earth

Less than 2

Ω

18

−

body earth

Earth

Less than 2

Ω