3
C
S
roll stability program, or yaw control are operating – will also
be illuminated when there are active ABS, ATC, or ESP
DTCs.
(See the Glossary on page 8 for more information
on these terms.)
See Figure 5.
When ignition power is applied, each
modulator solenoid is briefly energized. If the air system
is fully charged – and the service brake pedal is depressed
during ignition – the modulator creates a single, sharp
audible “chuff” of air pressure. Bendix ECUs will perform
a PMV Chuff Test on all installed modulators in the order
shown in Figure 5. The pattern will then repeat itself.
Service &
Spring Brake
Chamber
Antilock
Controller
Slack Adjuster
Wheel Speed
Sensor
Wheel Speed
Sensor
Wheel Speed
Sensor
Yaw Rate
Sensor
Steering
Angle Sensor
Service
Brake
Chamber
Brake
Valve
Glad Hands
Spring
Brake
Chamber
Service Brake
Chamber
SL-4
™
Stop Light Switch
TP-5
™
Tractor
Protection Valve
TCS-9000
™
Trailer
Control
Valve
Pressure
Modulator
Valve
Pressure
Modulator
Valve
Pressure Modulator Valve
Pressure
Modulator
Valve
Pressure Modulator Valve
Antilock Relay Valve
Antilock
Traction
Relay
Valve
Air Disc
Brake
For Illustration Purposes Only, Both
Air Disc Brakes And Foundation
Drum Brakes Are Shown At Either
Side Of The Axles.
Air Disc
Brakes
Foundation
Drum Brakes
Foundation Drum
Brakes
Trailer
(Supply)
Trailer
(Control)
Secondary
Brake
Circuit
Secondary
Brake Circuit
Primary
Brake
Circuit
Primary
Brake Circuit
Figure 4 - Typical System Diagram (4S-4M System Shown)
1. Steer Axle Right PMV
2. Steer Axle Left PMV
3. Drive Axle Right PMV
4. Drive Axle Left PMV
5. Additional Axle Right PMV
6. Additional Axle Left PMV
7. Trailer PMV
Driver
Right Steer
Left Steer
Right
Additional
Left
Additional
Right Drive
Left Drive
7
1
2
3
4
5
6
Figure 5 - Typical Vehicle Orientation and Chuff
Sequence