LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 1990 >> Beretta GT, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.3L PFI >> Diagnostic Tests >> Code 24: Vehicle Speed Sensor >> Notes

Code 24: Vehicle Speed Sensor: Notes

NOTE: On vehicles with automatic transmission, a faulty or improperly adjusted park/neutral switch can result in a false Code 24. Use a "Scan" tester and check for proper signal while in Drive. Refer to SYSTEMS & COMPONENT TESTING article in this section for P/N switch diagnosis.
  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 sets when drive wheels are not turning faster than 3 MPH. PM generator only produces a signal if drive wheels are turning greater than 3 MPH.

  2. Ensure correct MEM-CAL is used before replacing ECM.
scientia non olet · About LEMON Manuals