User's Manual

ManualsBrandsBENDIX ManualsABS SystemBENDIX TCH-013-013

Technical Bulletin

Bulletin No: TCH-013-013 Effective Date: 10/27/06 Cancels: N/A Page: 1 of 2

Subject: Bendix

Advanced ABS Systems: Repair and Calibration

Bendix ABS systems use sensors to monitor the vehicle's motion. For basic ABS braking and/or traction

functions, the Electronic Control Unit (ECU) uses the wheel speed sensors to detect wheel-slip conditions and

intervenes as needed.

In addition, Bendix advanced ABS ECUs, for example the Bendix

EC-60

™

Advanced ABS with ESP

stability,

monitor the wheel speed sensors, steering wheel position, brake demand, vehicle load, and yaw rate/lateral

acceleration sensors to reduce the risk of rollovers, jackkniﬁ ng and other loss of control.

ECU CONFIGURATION

Unlike previous generations of ECUs, Bendix

EC-60

™

Advanced

ECUs are vehicle-speciﬁ c and are individually conﬁ gured. Bendix

and the original equipment manufacturer work together to speciﬁ cally

customize the stability system for the individual vehicle conﬁ guration

and its sensors. As a result, the vehicle's VIN number is required

when ordering a replacement ECU to ensure the same conﬁ guration

is preset. See the Service Data sheet (SD-13-4869) for more

information.

SENSOR CALIBRATION

Since advanced ABS ECUs are individually customized based on

expected sensor locations and orientations, an out-of-calibration

sensor, or incorrectly positioned sensor, may lead to unwanted

and/or unneeded stability interventions, which can result in incidents

leading to loss of vehicle control.

A list of examples below show many vehicle maintenance

procedures that need to include Advanced ABS sensor recalibration.

Bendix

ACom

PC diagnostic software (version 5.3 or higher) is

used to recalibrate the sensors.

1. Steering Angle Sensor Examples.

The Steering Angle Sensor must be recalibrated as part of:

• Steering wheel replacement (see Caution below.)

• Steering angle sensor replacement

• Any maintenance that involves opening the connector hub from

the steering angle sensor to the column

• Any maintenance or repair work on the steering linkage, steering

gear or other related mechanism

• Wheel alignment or wheel track adjustment

• Accident repairs where damage to the steering angle sensor

or assembly, or any part of the steering system may have

occurred

continued over ...

CAUTION: When replacing a steering wheel, use only OEM-approved

steering wheels. Take care not to damage the Steering Angle Sensor or

interfere with its operation during installation.

A Bendix WS-24

™

Wheel speed sensor.

B Bendix SAS-60

™

Steering Angle Sensor

(mounted to the steering column).

C Bendix YAS-60

™

Yaw Rate/Lateral Acceleration

Sensor (typically mounted to a cross-member

near the back of the vehicle cab).

D Brake Demand Sensor (installed in the primary

and secondary delivery circuits), also used

as a Load Sensor (typically installed in the

suspension air bag).

Bendix EC-60

™

Advanced ABS Controller

TYPICAL

ADVANCED ABS

COMPONENTS

Summary of content (2 pages)

PAGE 1
Technical Bulletin Bulletin No: TCH-013-013 Subject: Effective Date: 10/27/06 Cancels: N/A Page: 1 of 2 Bendix® Advanced ABS Systems: Repair and Calibration Bendix ABS systems use sensors to monitor the vehicle's motion. For basic ABS braking and/or traction functions, the Electronic Control Unit (ECU) uses the wheel speed sensors to detect wheel-slip conditions and intervenes as needed.
PAGE 2
Bulletin No: TCH-013-013 Effective Date: 10/27/06 Cancels: N/A Page: 2 of 2 Subject: Bendix® Advanced ABS Systems: Repair and Calibration 2. Yaw Rate/Lateral Acceleration Sensor Examples.