Code EO24, Vehicle Speed Sensor (VSS)

The speed sensor, which is a Permanent Magnet (PM) generator, provides the control module with vehicle speed information. The PM generator, mounted in the transmission, produces a pulsing voltage signal whenever the vehicle speed is more than 3 MPH. The voltage level and pulses increase with vehicle speed. The control module converts the pulsing voltage to MPH, which is used by the control module in calculations to determine vehicle adjustments.

NOTE: Test numbers refer to test numbers on diagnostic chart.

Code EO24 will set if vehicle speed is less than 3 MPH when engine is running, Code EO29 and 31 are not set, vehicle is in 4th gear and all conditions have been met for 2-40 seconds.
Before replacing control unit, check MEM-CAL for correct application.

Fig 1: Code EO24, Schematic, Speed Sensor (VSS)

Fig 2: Code EO24, Flow Chart, Speed Sensor (VSS)