Note On Intermittents

1991 Cadillac Seville STSSECTION Note On Intermittents

If Code EO24 is stored as a history code, select parameter ED12. Lift drive wheels, place transmission in Drive and allow wheels to turn. Manipulate affected wiring while observing parameter ED12. If fault is induced, parameter ED12 will momentarily drop to zero MPH. Check intermittent opens or shorts to ground on circuits No. 400 and No. 401. Check terminal contact at VSS and at PCM connector.

Fig 1: PCM Code EO24, Schematic, Speed Sensor Circuit Problem
G91A07563
RENDER: 1.0x

NO RELATED

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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.