User's Manual

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Acceptable Tire Sizes

The speed calculation for an exciter ring with 100 teeth

is based on a default tire size of 510 revolutions per mile.

This gure is based on the actual rolling circumference of

the tires, which varies with tire size, tire wear, tire pressure,

vehicle loading, etc.

The ABS response sensitivity is reduced when the actual

rolling circumference is excessive on all wheels. For a 100

tooth exciter ring, the minimum number of tire revolutions

per mile is 376, and the maximum is 665. The ECU will

set a Diagnostic Trouble Code (DTC) if the number of

revolutions is out of this range.

In addition, the size of the steer axle tires compared to

the drive axle tires also has to be within the ABS system

design. To avoid DTCs, the ratio of the effective rolling

circumference of the steer axle, divided by the effective

rolling circumference of the drive axle, must be between

0.85 to 1.15.

The Bendix

ESP

system with the EC-80 Controller

effectiveness relies on the accuracy of vehicle speed.

If a major change on the tire sizes is made — such that

the odometer setting needs to be changed to correct

for the new tires — the Bendix ESP EC-80 Controller's

setting of tire sizes must also be reprogrammed to

revised values.

SYSTEM IMPACT DURING ACTIVE

DIAGNOSTIC TROUBLE CODES (DTCs)

ABS PARTIAL SHUTDOWN

Depending on which component the DTC is detected,

the Bendix ABS, ATC, and ESP system functions may

be fully or partially disabled. Even with the ABS indicator

lamp illuminated, the Bendix ESP EC‑80 Controller may

still provide ABS function on wheels that are not affected.

The ABS system Controller should be serviced as soon

as possible.

Steer Axle ABS Modulator DTC

ABS on the affected wheel is disabled. ABS and ATC on

all other wheels remains active. The Bendix ESP system

with the EC‑80 Controller is disabled.

Drive Axle/Additional Axle ABS Modulator DTC

ATC is disabled. ABS on the affected wheel is disabled.

ABS on all other wheels remains active. The Bendix ESP

EC‑80 system is disabled.

Steer Axle Wheel Speed Sensor DTC

The wheel with the DTC is still controlled by using input

from the remaining wheel speed sensor on the steer axle.

ABS remains active on the rear wheels. The Bendix ATC

and ESP systems are disabled.

Drive Axle/Additional Axle Wheel Speed Sensor

DTC

The Bendix ATC and ESP systems are disabled. In a four

sensor system, ABS on the affected wheel is disabled, but

ABS on all other wheels remains active.

In a six sensor system, ABS remains active by using input

from the remaining rear wheel speed sensor on the same

side.

ATC Modulator DTC

The Bendix ATC and ESP systems are disabled. ABS

remains active.

J1939 Communication DTC

The Bendix ATC and ESP systems are disabled. ABS

remains active.

ECU DTC

The Bendix ABS, ATC, and ESP systems are disabled.

The system reverts to normal braking.

Voltage DTC

While voltage is out of range, Bendix ABS, ATC, and ESP

systems are disabled. The system reverts to normal

braking. When the correct voltage level is restored, full

ABS and ATC function is available. The operating voltage

range is 9.0 to 17.0 VDC for 12 volt systems, and 20 to 33.5

volts for 24 volt systems.

Steering Angle Sensor DTC