Mitsubishi Stealth 1994 Import Service Manual page 215

POINTS IN WAVEFORM MEASUREMENT
Symptom
Too small or zero waveform
amplitude
Waveform amplitude fluctuates
excessively (this is no problem if
the minimum amplitude is 100 mV
or more)
Noisy or disturbed waveform
NOTE
The wheel speed sensor cable moves following motion of the front or rear suspension. Therefore, it is likely that it has an
open circuit only when driving on rough roads and it functions normally on ordinary roads. It is, therefore, recommended
to observe sensor output voltage waveform also under special conditions, such as rough road driving.
BRAKES - Service Adjustment Procedures
Probable causes
Faulty wheel speed sensor
Incorrect pole piece-to-rotor clearance
Axle hub eccentric or with large runout
Open circuit in sensor
Open circuit in harness
Incorrectly mounted wheel speed sensor
Rotor with missing or damaged teeth
INSPECTION OF HYDRAULIC UNIT
INSPECTION BY FEEL
placed at the specified jack-up points.
(2) Release the parking brake and determine the drag force
(drag torque) of each wheel by feel.
(3) Set the scan tool as illustrated.
Caution
Turn off the ignition switch beforehand whenever the
scan tool is connected or disconnected.
(4) After confirming that the shift lever or selector lever is in
the neutral position, start the engine.
The ABS warning light lights up, it goes into the scan tool
mode. In the scan tool mode, ABS does not function.
(5) Operate the scan tool to force the actuator to operate (item
No. 04, 05, 06).
(6) Turning the wheel manually, check the change of the
braking force when the brake pedal is depressed.
The change should be as shown in the following illustration.
NOTE
While the ABS is in the fail safe mode, the scan tool
actuator test cannot be made.
5-59
Remedy
Replace sensor
Adjust clearance
Replace hub
Replace sensor
Correct harness
Mount correctly
Replace rotor