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Home >> Oldsmobile >> 1989 >> Cutlass Calais Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.3L PFI Tests W/Codes >> Diagnosis & Testing >> Code 24, Vehicle Speed Sensor (VSS) Circuit >> Notes

Code 24, Vehicle Speed Sensor (VSS) Circuit: Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 24 will set (with vehicle speed less than 2 mph) only if the following conditions are met:
    • Engine RPM is between 1600 and 3600.
    • TPS is greater than 7 percent.
    • Gear selector not in Park or Neutral.
    • All conditions met for 20 seconds.
    • No Codes 21 or 22.

    Above conditions are met during road load deceleration. Ignore Code 24 that sets when drive wheels are turning faster than 3 MPH. PM generator only produces a signal if drive wheels are turning greater than 3 mph.

  2. Ensure that correct PROM is used before replacing ECM.
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