Mitsubishi Eclipse 1990 Service Manual page 1752

When turning by
, hand
-:--'---t---i-.-i-.-;----~---!---
--!-4--
When idling (5-6
gear (manual transaxle) or
(automatic transaxle
10.0
1
Points In Waveform Measurement
Symptom
Too small or zero waveform
amplitude
Waveform amplitude fluctuates ex-
cessively (this is no problem if the
minimum amplitude is 100
more)
Noisy or disturbed waveform
NOTE
The wheel speed sensor cable moves following motion of the front or rear
it has an open circuit only when driving on rough roads and it functions normally on
recommended to observe sensor output voltage waveform also under special conditions,
On-vehicle
Inspecting Wave Forms With An Oscilloscope
Use the following
from
Start the engine, and
gear (vehicles
(vehicles with
NOTE
1. Check the connection of the
2. The wave form measurements can also be
the vehicle is actually moving.
3. The output voltage will be low when the wheel speed
'is low, and similarly it will be higher as the wheel speed
Probable causes
Faulty wheel speed sensor
Axle hub eccentric or with large
or
Open circuit in sensor
Open circuit in harness
Incorrectly mounted wheel speed sensor
ABS rotor with missing or damaged teeth
TSB Revision
to
wheel sensor'
manual transaxle) or
so that they, at a
before using the oscilloscope.
Remedy
Replace sensor
Replace hub
Replace sensor
C o r r e c t
.
wave
by engaging
the rear
,
is likely
. . . .
,
It
IS
rough