Peterbilt 325 2017, Operator'S Manual

Page: 86 / 392

WARNING SYMBOLS
NOTE
• Tractors/Trucks and trailers
built after 3/1/01 must be
able to turn on an In-Cab
Trailer ABS Warning Lamp
(per U.S. FMVSS121). The
industry chose Power Line
Communication (PLC) as the
standard method to turn it on.
• On trailers built prior to 3/1/01
verify trailer ABS system status
via the required external warning
lamp mounted on the trailer.
The indicator lamp on the trailer
should be yellow and identified
with the letters "ABS".
7. Axle, Inter-Axle Differential
Locked (Tandem Axles)
Illuminates when the inter-axle
differential switch is ON thus locking
the inter-axle differential. This powers
the forward rear and the rear rear
differentials equally. When the switch
is turned off (inter-axle differential
unlocked) the engine power is allowed
to flow to any of the 4 drive tires based
on the differential effect (mostly to the
forward rear differential). (This feature
is standard on all tandem axles).
8. Axle, Stability Control (ESC
or Electronic Stability Control)
Calculates the driver’s intended
path of travel from wheel speed and
steering angle sensors, then compares
calculations to the actual direction of
travel. The system uses individual
wheel brakes to re-adjust the path of
the vehicle.
•
Illuminates during the power-on
self-test when the ignition is
turned ON. It turns off after a few
seconds if no system problems
are detected. If an ESC problem
is detected, the ESC warning lamp
will turn on and stay on.
•
Illuminates when the ESC system
is regulating individual wheel
brakes to correct the vehicle’s
direction of travel.
9. Axle, Traction Control (ATC
or Automatic Traction Control)
Watches vehicle’s wheel speeds
to detect slippage and may reduce
engine power, or apply vehicle brakes,
to help increase traction.
•
Illuminates during the power-on
self-test when the ignition is
turned ON. It turns off after a few
seconds if no system problems
are detected. If an ATC problem is
detected, the ATC warning lamp
will turn on and stay on.
•
Illuminates when the ATC is
regulating wheel spin and turns off
after the traction control event has
ended.
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Y53-6060-1C1 (03/17)
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