1992 Saturn SL2 AutomaticFACTORY OEM SERVICE PROCEDURE

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. ABS system is sensitive to ring damage. Inspect sensor ring for tooth damage or out-of-round condition. Ensure gap between sensor and sensor ring is .025-.070" (.64-1.78 mm).
  3. Measure resistance between sensor terminals. Resistance should be 1650-1800 ohms.
  4. Connect "Scan" tester. Spin wheel by hand while monitoring wheel speed. Compare "Scan" tester indications with those from other wheels.
  5. 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.
  6. When diagnosing intermittent problems, select MALF HISTORY from "Scan" tester ABS menu. Supplemental data can be used to duplicate problem.
Fig 1: Code 25 Schematic - LF Wheel Speed Acceleration Fault
G92D05382Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

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When to See a Mechanic

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

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

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