BENDIX M-21-M-22 ANTILOCK MOD ASSY Installationsanleitung PDF herunterladen (Seite 42)

MBS-2 Installation

In-Axle Wheel Speed Sensor and Reverse Detect Feature

The MBS-2 system incorporates an active Hall effect in-axle wheel speed

sensor in place of the passive VR wheel speed sensor used in all other ABS

systems. This wheel speed sensor is mounted on the axle end using the

freeze plug to secure it in place while the magnet is located inside the hubcap.

The use of this technology provides several advantages. The sensor can

detect reverse motion of the vehicle. This allows the ABS to control backup

lights or any other accessory needed to be turned ON or OFF during reverse

motion. Other advantages are that the sensor and wiring harnesses are

located in a protected environment and sensor gap issues simply do not apply.

The sensor also contains a temperature sensor that is used to alert the operator

and maintenance personnel of an elevated bearing temperature. This is done

with the use of an optional secondary trailer warning lamp. The location of this

lamp is also optional according to customer preference and legal

requirements. See pages 44 and 45 for more information.

The reverse detect feature activates based on input from two sensors. On a

four-sensor system this means that the feature is activated from the front axle

sensors input. Both wheels must be rotating in reverse at a speed less than

fifteen miles per hour and auxiliary power must be present in order for the

feature to be activated. The reverse detect feature is not activated immediately

when the vehicle moves backward for the first time to avoid turning on the

lamps when the vehicle inadvertently drifts backward at a stoplight. There is a

2.5-second delay built into the system to avoid this. Once the vehicle is

moving in reverse for 2.5 seconds the backup lights will come on and remain

on until the vehicle is stopped for ten seconds or the operator pulls forward for

more than five seconds. However, they will illuminate immediately every time

the vehicle is reversed until the vehicle exceeds 10 miles per hour while

moving forward or the vehicle moves forward for more than five seconds. Then

the reverse detection system is reset back to the 2.5-second delay.

NOTE: When performing an installation of MBS-2 with backup lamps,

always check backup lamp operation before releasing the unit for

service.

In the event the reverse lights do not illuminate when they should, here are

some troubleshooting steps to follow:

1. Make certain there are no current faults on the system. (The malfunction

lamp will go out at power up.) If a current fault exists, correct the problem

and recheck the operation of backup lamps.

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Installationsanleitung Seite 42