Bendix Commercial Vehicle Systems TABS-6 ADVANCED SINGLE CHANNEL - Manual (Page 11)

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17. NON‑STANDARD TIRE SIZE
The Bendix ® TABS‑6 ™ Adv 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 rpm’s
80 teeth 512 to 801 rpm’s
90 teeth 456 to 711 rpm’s
100 teeth 410 to 640 rpm’s
120 teeth 356 to 502 rpm’s
CHART 4 – Tone ring Size To Tire rolling rAdiuS
18. DIAGNOSTIC TROUBLE
CODE DETECTION
The TABS‑6 Adv module contains self‑testing diagnostic
circuitry that monitors the ABS components and wiring.
When the TABS‑6 Adv 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 module also uses PLC communications to send the
system status to the towing vehicle.
For some trouble codes, the TABS‑6 Adv 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 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 3
Inactive DTC Retrieval (DTC History) 4
Clear Active DTCs 5
Odometer Mileage Display 7
CHART 5 – Blink code informATion
Depending on the blink code mode activated, the TABS-6
Adv 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.