Diagnostic Aids

1992 Saturn SL1 AutomaticSECTION Diagnostic Aids
  1. Make thorough inspection of wheel speed sensor circuitry. Pay particular attention to connectors, since connectors are the most likely area for problems.
  2. Connect "Scan" tester. Spin wheel by hand while monitoring wheel speed. Compare "Scan" tester indications with those from other wheels.
  3. Suspected intermittents or opens at connectors can be detected with diagnostic service probe which permits voltage to be measured on wires without unplugging connectors. Ensure terminals make good connection.
  4. When diagnosing intermittent problems, select MALF HISTORY from "Scan" tester ABS menu. Supplemental data can be used to duplicate problem.
Fig 1: Code 24 Schematic - RR Wheel Speed Equals Zero MPH
G92D05382Courtesy of GENERAL MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.