Code 24, Vehicle Speed Sensor (Pm Generator): Notes

The Permanent Magnet (PM) generator, mounted in the transaxle, produces a pulsing voltage signal whenever the vehicle speed is greater than 3 MPH. The voltage level and the number of pulses increase with vehicle speed. The ECM converts the pulsing voltage to MPH, which is used by the ECM in calculations to determine vehicle adjustments.

1. Code 24 will set if all of the following conditions are met for at least 5 seconds:
   • Vehicle speed is zero MPH when transmission is not in Park or Neutral
   • Engine speed is between 1600-4400 RPM
   • TPS indicates closed throttle
   • Low airflow condition is sensed
2. Before replacing the ECM, MEM-CAL should be checked for correct application.