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Technical Training

Speed Sensors (Electronic Wheel and Vehicle)

Every Monroe® Premium Brake Pad installation should include inspection of the speed sensors and modules. This accounts for approximately 80% of all ABS failures which may or may not cause an ABS light to activate. Refer to O.E. specifications.

Condition	Code	Procedure
Air gap incorrect	B	Require adjustment or replacement
If a sensor is not adjustable, further inspection is required to identify and correct the cause.	C
Attaching hardware missing	C	Require replacement of hardware
Attaching hardware threads damaged	A	Require repair or replacement of hardware
Attaching hardware threads stripped (threads missing)	A	Require repair or replacement of hardware
Connector (Weatherpack type) leaking	A	Require repair or replacement
Connector broken	A	Require repair or replacement
Connector melted	A	Require repair or replacement
Determine cause and Correct prior to repair or replacement of part.
Connector missing	C	Require replacement
Contaminated	A	Require repair or replacement
Determine source of contamination, such as metal particles or water. Require repair or replacement.
Inoperative	A	Require repair or replacement
Inoperative includes intermittent operation or out of OEM specification. Some components may be serviceable; check for accepted cleaning procedure.
Lead routing incorrect	B	Require rerouting according to vehicle manufacturer's specifications
Leaking	B	Require repair or replacement
Loose	A	Require repair or replacement
Missing	C	Require replacement
Resistance out of specification	B	Require repair or replacement
Sensor housing cracked	2	Suggest replacement
Terminal broken	A	Require repair or replacement
Terminal burned, affecting performance	A	Require repair or replacement
Determine cause and correct prior to repair or replacement of part.
Terminal burned, not affecting performance	2	Suggest repair or replacement
Terminal corroded, affecting performance	A	Require repair or replacement
Terminal corroded, not affecting performance	2	Suggest repair or replacement
Terminal loose, affecting performance	B	Require repair or replacement
Terminal loose, not affecting performance	1	Suggest repair or replacement
Threads damaged	A	Require repair or replacement
Threads stripped (threads missing)	A	Require replacement
Wire lead conductors exposed	B	Require repair or replacement
Wire lead corroded	A	Require repair or replacement
Wire lead misrouted	B	Require re-routing according to vehicle manufacturer's specifications
Wire lead open	A	Require repair or replacement
Wire lead shorted	A	Require repair or replacement


Legend
A	Part no longer performs intended purpose
B	Part does not meet a design specification (regardless of performance)
C	Part is missing
1	Part is close to the end of its useful life (just above discard specifications, or weak; failure likely to occur soon, etc.)
2	To address a customer need, convenience, or request (to stiffen ride, enhance performance, eliminate noise, etc.)
3	To comply with maintenance recommended by the vehicle’s Original Equipment Manufacturer (OEM)
4	Technician’s recommendation based on substantial and informed experience




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