Quick Tests

NOTE: DO NOT bypass pinpoint tests and use only Quick Tests. The Quick Tests are designed to be used as a reference.

This chart is used as a reference and is meant to be used in conjunction with the Rotunda Breakout Box 014-00322 or equivalent, Rotunda Breakout Box Adapter with Overlay 007-00103 or equivalent.

NOTE: Perform the following measurements with Rotunda 88 Digital Multimeter 105-00053 or equivalent.

NOTE: Rotunda Breakout Box Adapter with Overlay 007-00103 or equivalent must be installed.

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 test 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.

   QUICK TEST

   Measure Between
   Item To Be Tested	Ignition Mode	Pin Number(s)	Scale/Range	Specification
   Anti-Lock Brake Electronic Control Module Ground Test	Off Off Off	1 + Chassis Gnd 14 + Chassis Gnd 17 + Chassis Gnd	Ohms Ohms Ohms	Continuity Continuity Continuity
   Battery Power to Anti-Lock Brake Electronic Control Module Test	On	20 + 1	Volts	8V Minimum
   Jumper Pins 1 + 19 (Energizing Main Relay) Power from Main Relay	On	17 + 1	Volts	8V Minimum Verify ABS warning lamp is OFF.
   Main Relay Coil	Off	19 + 20	Ohms	54-68 Ohms
   Pump Motor Relay	Off	17 + 29	Ohms	54-68 Ohms
   ABS Warning Light Ground through Main Relay	Off	17 + 1	Ohms	Continuity
   Inlet Front Right Isolation Valve Resistance	Off	17 + 34	Ohms	5-8 Ohms
   Inlet Front Left Isolation Valve Resistance	Off	17 + 40	Ohms	5-8 Ohms
   Inlet Rear Axle Isolation Valve Resistance	Off	17 + 33	Ohms	5-8 Ohms
   Outlet Front Right Dump Valve Resistance	Off	17 + 15	Ohms	3-6 Ohms
   Outlet Front Left Dump Valve Resistance	Off	17 + 26	Ohms	3-6 Ohms
   Outlet Rear Axle Dump Valve Resistance	Off	17 + 27	Ohms	3-6 Ohms
   Right Front Brake Anti-Lock Sensor Resistance	Off	23 + 36	k Ohms	1.0-1.2 k Ohms
   Left Front Brake Anti-Lock Sensor Resistance	Off	24 + 25	k Ohms	1.0-1.2 k Ohms
   Vehicle Speed Sensor Resistance	Off	21 + 22	k Ohms	0.8-1.4 k Ohms
   Pump Motor Speed Sensor	Off	37 + 38	Hz	Greater than 150 Hz, pump motor ON. Less than 70 Hz, pump motor OFF.
   Sensor Output:
   Right Front Brake Anti-Lock Sensor	Off	23 + 36	Hz and mV	3.4 mV/Hz, or Greater
   Left Front Brake Anti-Lock Sensor	Off	24 + 25	Hz and mV	3.4 mV/Hz, or Greater
   Vehicle Speed Sensor	Off	21 + 22	Hz and mV	6 mV/Hz, or Greater
   System Diode	Off	18 (Meter Polarity +) or 17 (Meter Polarity -)	Diode Check	0.5 Volts
   Remove Main Relay	Off	18 (Meter Polarity +) or 17 (Meter Polarity -)	Diode Check	Continuity

   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 front brake anti-lock sensor or vehicle 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 all measurements with Rotunda 88 Digital Multimeter 105-00053 or equivalent. If not, higher wheel speed may be required in order for the frequency meter to correctly function.