Peterbilt 387 - Warning Alarms

PART 7: STARTING & OPERATING THE VEHICLE WARNING ALARMS
(R10/06) Y53-6007 – 115 –
• If the engine rpm moves beyond the maximum gov-
erned speed, indicating an overspeed condition,
apply the service brake or shift to a higher gear to
bring engine rpm within the optimum speed range.
• When driving downhill: shift to a lower gear, use the
engine brake (if so equipped), and use the service
brake, keeping the engine speed below 2,100 rpm.
When the engine speed reaches its maximum governed
speed, the injection pump governor cuts off fuel to the
engine. However, the governor has no control over the
engine rpm when it is being driven by the vehicle's trans
-
mission, for example, on steep downgrades. Apply service
brakes or shift to a higher gear.
Fuel economy and engine performance are also directly
related to driving habits:
• The best results in trip time and fuel economy are
obtained while driving the vehicle at a steady speed.
• Shift into higher or lower gears (or apply the service
brake) to keep engine rpm near the lower end of the
optimum operating range.
• Avoid rapid acceleration and braking.
Warning Alarms
A warning alarm occurs when some condition in the vehi-
cle requires attention. A warning alarm cannot be turned
off or manually reset. Once triggered, an alarm will con
-
tinue to exist until the unacceptable condition or fault in a
function is corrected. Warning alarms can be generated by
two main sources in a Model 387: the multiplex instrumen
-
tation system and (if equipped) the digital message center.
Multiplex Instrumentation System Alarms
NOTES: In addition to the warning messages
mentioned in this part - if any of the following con-
ditions occur after startup and self-test, the multi-
plex instrumentation system should be serviced:
• The speedometer-message center (SMC)
pointer exhibits windshield wiper-like motion
and the display reads NO DATA.
• One or more gauge pointers exhibit wiper-like
motion.
• A gauge pointer stays at zero with its red light
flashing.
• A gauge pointer goes to and remains at a 2:00
position with its red light on steady.