Bendix Commercial Vehicle Systems TABS-6 ADVANCED MC SD SHEET User Manual

Page 11

17. NON‑STANDARD TIRE SIZE

The Bendix

TABS‑6

™

Adv MC module allows for tire rolling

radius and tone ring tooth count parameters to be set for

the axle being sensed using the Bendix

ACom

diagnostic

software. These adjustments may be necessary for the

module to accurately calculate the vehicle velocity and

odometer mileage. Wheels of the same axle must have,

and be set to the same, rolling radius and tone ring tooth

count. Refer to the manufacturer’s tire specification for

correct values.
The tone ring size is defaulted to 100 teeth, and the tire-

rolling radius is defaulted to 511 revolutions per mile. These

parameters can be adjusted as shown in Chart 4.

Tone Ring

Size

Tire Rolling Radius –

Allowable Range

60 teeth

712 to 1005 rpms

80 teeth

512 to 801 rpms

90 teeth

456 to 711 rpms

100 teeth

410 to 640 rpms

120 teeth

356 to 502 rpms

CHART 4 – tone RinG Size to tiRe RollinG RAdiuS

18. DIAGNOSTIC TROUBLE

CODE DETECTION

The TABS‑6 Adv MC module contains self‑testing

diagnostic circuitry that monitors the ABS components

and wiring.
When the TABS‑6 Adv MC module senses an erroneous

system condition, it activates the external trailer‑mounted

ABS indicator lamp; disables all or part of the affected

ABS and/or TRSP functions; and it stores the Diagnostic

Trouble Code (DTC) in memory, so that the information is

retained even when the power is removed. The TABS‑6

Adv MC module also uses PLC communications to send

the system status to the towing vehicle.
For some trouble codes, the TABS‑6 Adv MC module will

automatically reset (“self-heal”) the active DTC when the

error is corrected (e.g. when a wheel speed sensor is re‑

aligned). However, repeated occurrences of a given DTC

can cause the code to “latch” — that is, be retained as

active — even if the condition is only intermittent. Once

the code is latched, a manual reset will be necessary.

Technicians can use these latched codes to assist them

in troubleshooting intermittent errors. After the problem

is repaired, the DTC can be reset using blink code

diagnostics, or with a diagnostic tool.
When a DTC self-heals or is manually reset, the code

remains stored as an inactive DTC in the ECU memory.

This inactive DTC can be retrieved using blink code

diagnostics or with a diagnostic tool.

19. PARTIAL ABS SHUTDOWN

Depending on the DTC detected, the ABS ECU will

partially or completely disable the ABS and/or Bendix

TRSP

functionality. In cases where the ABS is completely

disabled, the vehicle reverts to normal braking (without

ABS or TRSP interventions). Always repair ABS DTCs at

the earliest opportunity.

ECU Diagnostic Trouble Codes

All ABS functions are completely disabled. The system

reverts to normal braking.

Voltage Diagnostic Trouble Code

The operating voltage range is 8.0 to 32.0 VDC. If the

voltage is detected as being out of range, the ABS and

TRSP system braking features will be disabled, and the

system reverts to normal braking. When the correct voltage

level is restored, full ABS and TRSP is typically available

again.

20. BLINK CODE DIAGNOSTICS

The TABS‑6 Adv MC module provides diagnostic functions

through blink code diagnostics. This means that the

technician — even without diagnostic tools — can read a

series of ABS indicator lamp blinks to diagnose the DTCs

being generated.
With no towing vehicle attached, enter the blink code

diagnostics mode by providing constant power to the

ignition circuit and then toggling the brake light power

input the specific number of times shown in Chart 5, for

the desired mode.
With a parked towing vehicle attached, apply ignition power,

and after the power-up sequence is complete, enter the

diagnostics mode by depressing and releasing the brake

pedal the specific number of times shown in Chart 5, for

the desired mode.

Cycles to Enter Desired Mode

Mode

Cycles

Active DTC Retrieval

Inactive DTC Retrieval (DTC History)

Clear Active DTCs

Odometer Mileage Display

CHART 5 – blink code inFoRmAtion

Depending on the blink code mode activated, the TABS-6

Adv MC module will blink the trailer‑mounted ABS indicator

lamp to display: active DTC codes; inactive DTCs; and

odometer mileage. Blink code diagnostics can also be

used to clear active DTCs.