the engine and determine the cause. Refer to the ve-
hicle workshop manual for repair procedures.
IMPORTANT: If the warning system does not acti-
vate when the ignition is turned on, repair the sys-
tem to provide warning protection for oil pressure,
coolant temperature, and the brake system.
Meritor WABCO
®
Antilock Braking
System (ABS), Air Brake Systems
The ABS warning light comes on after the engine is
started. The warning light goes out only if all of the ABS
components are working properly.
IMPORTANT: If the ABS warning light does not
work as described above, or comes on while driv-
ing, repair the ABS system immediately to ensure
full antilock braking capability. Refer to the vehicle
workshop manual for troubleshooting procedures.
Refer to the brake system operating instructions in
Chapter 7 for more instructions.
Instruments
Tachometer
A tachometer (see Fig. 3.15) indicates engine speed in
revolutions per minute (rpm), and serves as a guide for
shifting the transmission and keeping the engine in the
appropriate rpm range. For low idle and rated rpm, refer
to the engine identification plate.
The tachometer may include an engine hour meter. An
engine hour meter records continuous operating hours
of the engine. In cases where actual mileage does not
indicate overall usage, maintenance and lubrication in-
tervals for the engine and engine-operated equipment
can be determined by operating hours.
10/01/98
f601443a
Fig. 3.15, Tachometer
Driver Controls and Instruments
3.12
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