Monaco 2002 Diplomat, Service Manual

Page: 276 / 324

ABS Component Function:
• Speed sensors and tone rings on each
wheel monitor wheel rotation.
• Each speed sensor communicates
wheel rotation pulses to the Electronic
Control Unit.
• ECU receives the speed sensor inputs,
interprets the signal pulses, calculates
speed and acceleration rates of each
wheel.
• Based on the speed sensor input, the
ECU detects impending wheel lock
and operates the ABS Modulator
Valves required for proper control. The
Modulator Valves can be operated in
the air, release or hold modes to regulate
air pressure to the brake chambers.
• The braking force is applied at a level
which minimizes the stopping distances
while maintaining as much lateral
stability as possible.
ABS Warning Light:
The ABS will perform a diagnostic indicator lamp check and self diag-
nostic test each time the ignition is switched to the on position. The ABS
dash indicator light will illuminate momentarily (2.2 seconds) verifying the
self check test. If the ABS indicator light remains on, or illuminates while
the motorhome is being operated, there is a fault in the antilock brake system
only. This fault will not affect normal service braking. The motorhome will
need to go to a service center to repair the problem.
ABS Blink Code:
The ABS dash indicator light can be used to obtain system faults by
displaying a blink code.
To a retrieve blink code(s):
• Turn ignition key to the ON position.
• Using Systems Diagnostic Center located left of steering column
below dash board, depress and hold test button for three seconds.
Indicator light will illuminate while test button is depressed.
• After releasing test button, indicator lamp will turn off and blink
code will be displayed: 1-1 will indicate no system faults.
Chassis Information
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D I P L O M A T
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OM090271.eps