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8-60
Published 01-14-2021 Control # 707-01
CARRIER
TMS9000-2 SERVICE MANUAL
ATC Indicator
The ATC indicator (2), (Figure 8-61) is the primary indicator
of the ATC status. The ATC indicator:
•
Lights at key-ON and turns off after a two second lamp
check. ATC is active after the lamp check.
•
Flashes rapidly when ATC is operating.
•
Flashes slowly when the off-road mode is selected and
then flashes more rapidly when the automatic traction
control system operates.
•
Remains ON if an engine data link failure occurs.
Pressure Modulator Valves
Two types of ABS brake modulator valves are used with the
Bendix Anti-Lock Brake System: the M-32 and the M-32QR
(quick release) (Figure 8-63) anti-lock system modulators.
This section includes general information on both valves.
The M-32 and M-32QR (quick release) anti-lock system
modulators are high capacity, on/off air valves that use a pair
of electrical solenoids for control. The solenoids provide the
electro-pneumatic interface between the anti-lock controller
electronics and the air brake system. The modulator is used
to control the braking function during anti-lock activity.
The modulator consists of a die cast aluminum body and a
solenoid assembly which contains one normally open
solenoid, one normally closed solenoid, and an inlet and
exhaust diaphragm valve. A three–pin, weather resistant
electrical connector is an integral part of the modulator
solenoid assembly and serves to carry control commands
from the anti-lock controller to the modulator. The supply,
1
2
3
4
FIGURE 8-62
Port
Designation
1
Air Supply Port
2
Air Delivery Port
3
Treadle Port
4
Electrical Connector
FIGURE 8-63
M-32QR
M-32
Fo
r
Reference
Only