involves models: SAIC Roewe R750 car.
Symptom: vehicle wheel bearing replacement after completed, there does not work ABS system fault, the fault code stored related to the wheel speed sensor.
Failure: As the service manual, when installing the wheel bearings, hub bearing seal should be dark purple color of the side facing the wheel speed sensor, because the magnetic sensing wheel speed sensor on the side of the oil seal ring, the wheel speed sensor mounted within each front wheel hub and each of the trailing arm rear suspension, very close to each associated wheel bearing seal inside. Rotates together with the wheel driven by an oil seal 48 pairs of poles of the magnetic element, when the wheel rotates, the magnetic pole in the seal fluctuations in the wheel speed sensor voltage, the ripple voltage is converted square wave signal, and output to the ABS / DSC control unit, and the wheel speed signal proportional to the frequency. Thus, if the anti-loaded side is dark purple in the color wheel bearing oil seal repair process, so that the ABS system will not work properly, the wheel speed sensor fault codes stored within the system can not be cleared, the ABS system failure warning light.
countermeasures: Please strictly in accordance with the provisions of the installation procedure to replace the wheel bearings.
FIG 1
(1) when installing the wheel bearings, with the proper special tool (FIG. 1), or easy to damage induced magnetic coil, ABS system fault light will be illuminated equally. In addition, do not put close to the hub bearing with a magnetic or scrap iron, which may damage the components.
(2) mounting a front wheel bearings, the new bearings and seals must be installed together, and the side seal shall (corresponding to the wheel speed sensor) inwardly. When
FIG. 2
(3) detachably rear bearing, the rear hub and rear wheel axle shaft grease cap nut must be discarded (FIG. 2), It can not be reused.
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