Antilock Breakout Box Electrical Quick Check Sheet

This sheet is used as a reference and is meant to be used in conjunction with the Rotunda Breakout Box 014-00322 or equivalent, Antilock Brake Adapter Harness 007-00103 and overlay.

Many of the values given for various components depend on the presence of a good ground at Pin 1.

NOTE: The Pin 1 chassis ground must be verified as sound before any quick electrical check involving Pin 1 may be used. At any time, any known good chassis ground may be substituted for a Pin 1 designation.

NOTE: Connections between components must be verified as sound before replacement of affected components. Failure to observe above will often lead to improper replacement of components and incorrect resolution of concern. Replacement of good components will not resolve a vehicle wiring concern.

Keep in mind that a measurement falling outside the specification can mean one of two things:

1. The wiring between two components is worn or damaged.
2. The component is not electrically correct.








NOTE: Check for continuity between pin 1 and chassis ground or invalid results may be obtained. Results not matching specification indicate either a wiring or component concern. Further analysis is needed before any component is replaced. Refer to pinpoint tests for proper diagnostic procedures.

NOTE: To check wheel speed sensor output, measurements of both the frequency and the voltage output must be taken. The actual speed the wheels are turning is not important the result of voltage output divided by the frequency will not change with wheel speed. However, it is crucial that both the frequency measurement and the voltage output measurement be taken at the same wheel speed.

NOTE: Perform the following measurements with Rotunda 105-00053 Digital/Analog Volt Ohmmeter or equivalent. If not using Rotunda 105-00053 or Fluke Frequency Meter, higher wheel speed may be required in order for the frequency meter to correctly function.