Codes P0501/P0502, VSS Circuit: Notes

The Vehicle Speed Sensor (VSS) in transaxle provides vehicle speed information to control module. Voltage level and number of pulses increase with vehicle speed. Control module converts pulsing voltage to MPH, and MPH can be displayed using a Tech 1. The function of VSS buffer, used in past models, has been incorporated into control module. Control module supplies necessary signal for instrument cluster (4004 pulses per mile) for operating speedometer and odometer.

With Codes P0501 or P0502 set, cruise control operation will not be allowed. Code will remain set for remainder of that ignition cycle, and control module will command only 2nd and 3rd gear based on RPM and TP sensor. TCC will not be allowed to engage. Instrument cluster speedometer may be inoperative. Codes P0501 and P0502 will illuminate Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.

VSS signal generator only produces a signal if drive wheels are turning greater than 3 MPH.
Check PROM for correct application before replacing control module.