MANUALS · SERVICE BRAKES [35] · страница 103 из 140 · Открыть оригинал PDF ↗
Текст распознан со скана. Числа и обозначения можно сверить с оригиналом ниже.
When rotating by hand
When idling [5-6 km/h (3-4 mph)})
Ist gear (manual transmission) or
D range (automatic transmission)
5.If the output voltage is lower than the above values, the
reason could be as follows:
Excessive clearance betweenthewheel speed sen-
sor pole piece and the rotor
Wheel speed sensor is defective
If necessary, adjust the wheel speed sensor or replace it;
Next; to observe the output of the wheel speed sensors,
move the transfer shift lever to4Hand the transmis-
sioncontrolleverto(MT vehicles)orDrange
(AT vehicles),and rotate the wheels.
NOTE
Check the connection of the sensor harness and con-
nector before using the oscilloscope
2Thewaveformmeasurementscanalsobetaken
while the vehicle is actually moving:
3Theoutput voltagewillbe smallwhenthewheel
speed is low, and similarly it will be large when the
wheel speed is high_
WAVE OBSERVATION POINTS
Таблица в оригинале
Распознанный текст таблицы — требует сверки с оригиналом
| Symptom | Cause | Suggested remedy |
|---|---|---|
| Wave amplitude is too small, or ' | Wheel speed sensor is defective | Replace the sensor |
| doesnt appear at all | Wrong clearance between the pole piece ad rotor | Adjust the clearance |
| Excessive variation in the wave amplitude if the lowest amplitude (However, occurs at 2OOmV-p-p, there is no problem) | Excessive runout or eccentricity in the axle hub | Replace the hub |
| Noise or interference in the wave | Broken sensor wire | Replace the sensor |
| pattern | Broken harness wire | Repair the harness |
| Defective wheel speed sensor attachment | Repair the sensor attachment | |
| Eccentric rotor or broken rotor teeth | Replace the rotor |
NOTE
Asthewheel speedsensorharnessmove in conjunctionwiththemovement of the front andrear
suspension, the wires might break while driving on rough roads, but may have continuity while driving
on normal roads.Accordingly, when measuring the wave pattern of the wheel speed sensor output volt-
age,takemeasurement while shaking thesensorharness to simulatethe special conditions of
rough road_
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