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Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual - part 588

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-43

ACTUATOR TEST SPECIFICATIONS

CHECK AT ABS-ECU

M1352011800093

TERMINAL VOLTAGE CHECK CHART
1. Measure the voltages between terminals (16) and

(19) (ground terminals) 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 "ON." The ABS-ECU performs the initial
check during that period.

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 between the terminals indicated in the

table below.

3. The terminal layouts are shown in the illustration

below.

NO.

ITEM

PARTS TO BE
ACTIVATED

Solenoid valve for
front-left wheel

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

Solenoid valve for
front-right wheel

Solenoid valve for
rear-left wheel

Solenoid valve for
rear-right wheel

AC000971AC

ACTIVATION PATTERN

SOLENOID
VALVE

END OF
FORCED
ACTION

START OF
FORCED
ACTION

1 s

2 s

PUMP
MOTOR

OFF

NOTE
A:
B:
C:

HYDRAULIC PRESSURE DECREASES
HYDRAULIC PRESSURE HOLDS
HYDRAULIC PRESSURE INCREASES

AC002089 AB

CONNECTOR
TERMINAL NO

SIGNAL

CHECKING REQUIREMENT

NORMAL CONDITION

Input from stoplight
switch

Stoplight switch: ON

Battery positive voltage

Stoplight switch: OFF

Approximately 0 V

ABS-ECU power supply

Ignition switch: "ON"

Battery positive voltage

Motor power supply

Always

Battery positive voltage

Solenoid valve power
supply

Always

Battery positive voltage

SPECIAL TOOLS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-44

SPECIA L TO O LS

M1352000600073

AC002090 AB

CONNECTOR TERMINAL NO.

SIGNAL

NORMAL CONDITION

−

Front-left wheel speed sensor

1.28

−

1.92 k

Ω

−

Rear-right wheel speed sensor

1.28

−

1.92 k

Ω

−

Front-right wheel speed sensor

1.28

−

1.92 k

Ω

−

Rear-left wheel speed sensor

1.28

−

1.92 k

Ω

−

body ground

Solenoid valve ground

Less than 2 ohms

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991502
Scan tool (MUT-II)

MB991496-OD

For checking of ABS
(Diagnostic trouble code
display when using the
scan tool)

MB991529
Diagnostic trouble code
check harness

Tool not necessary if scan
tool (MUT-II) is available.

For checking of ABS
(Diagnostic trouble code
display when using the
ABS warning light)

MB991223
Harness set
A:MB991219
Inspection harness
B:MB991220
LED harness
C:MB991221
LED harness adaptor
D:MB991222
Probe

MB991223
MB991709-01

Making voltage and
resistance measurement
during troubleshooting
A: Connector pin contact
B: Power circuit
inspection
C: Power circuit
inspection
D: Commercial tester
connection

B991502

MB991529

MB991223

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-45

O N -VEH IC LE SERVIC E

BLEEDING

M1352001500057

CAUTION

Use the specified brake fluid. Avoid using a mixture of the
specified brake fluid and other fluid.

Specified brake fluid: Conforming to DOT 3 or DOT 4

MASTER CYLINDER BLEEDING

Refer to GROUP 35A

−

On-vehicle Service

−

Bleeding

P.35A-

BRAKE LINE BLEEDING

CAUTION

Be sure to filter/strain the brake fluid being added to the
master cylinder reservoir tank. Debris may damage the
hydraulic unit.
Refer to GROUP 35A

−

On-vehicle Service

−

Bleeding

P.35A-

WHEEL SPEED SENSOR OUTPUT VOLTAGE
MEASUREMENT

M1352001600076

Required Special Tool:
MB991219: Inspection Harness
1. Lift up the vehicle and release the parking brake.

2. Disconnect the ABS-ECU connector, and then use special

tool MB991219 to measure the output voltage at the
harness side connector.

3. Manually turn the wheel to be measured 1/2 to 1 turn/

second. Measure the output voltage with a voltmeter or
oscilloscope.

Output voltage:

•

Minimal voltmeter reading: 42 mV

•

Maximum voltmeter reading: 300 mV

•

Minimal oscilloscope reading: 120 mV

•

Maximum oscilloscope reading: 600 mV

Probable causes of low output voltage

•

Wheel speed sensor pole piece-to-ABS rotor clearance too
large

•

Faulty wheel speed sensor

TERMINAL NO.

Front left

Rear right

Front right

Front left

AC000948 AB

ABS-ECU CONNECTOR
(HARNESS SIDE)

ON-VEHICLE SERVICE

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-46

NOTE: Check the connection of the sensor harness and
connector before using the oscilloscope.
4. To observe the waveform with an oscilloscope:

•

Front Wheels: Shift into low gear and drive the wheels.

•

Rear Wheels: Turn the wheels manually at a constant
speed

NOTE: The output waveform is low when the wheel speed is
low. Similarly, it will be higher as the wheel speed increases.
Waveform may also be observed by driving the vehicle.

POINTS IN WAVEFORM MEASUREMENT

NOTE: The wheel speed sensor cable moves in relation to motion of the front or rear suspension. Therefore,
it is likely that it has an open circuit only when driving on rough roads but it functions normally when driving on
smooth roads. It is recommended to observe sensor output voltage waveform also under special conditions,
such as driving on a rough road.

AC000949 AB

WHEN TURNED MANUALLY

IN LOW GEAR, IDLING
[5

−

6 km/h (3

−

4 mph)]

[10.0 ms/DIV 1 V/DIV]

SYMPTOM

PROBABLE CAUSES

REMEDY

Too small or zero waveform
amplitude

Faulty wheel speed sensor

Replace sensor

Incorrect pole piece-to-ABS rotor
clearance

Adjust clearance

Waveform amplitude fluctuates
excessively (This is no problem if
the minimum amplitude is 100 mV
or more)

Axle hub eccentric or with large
runout

Replace hub

Noisy or disturbed waveform

Open circuit in wheel speed sensor Replace sensor

Open circuit in harness

Repair harness

Incorrectly mounted wheel speed
sensor

Mount correctly

ABS rotor with missing or
damaged teeth

Replace ABS rotor

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