Circuit Description

Vehicle Speed Sensor (VSS) is a permanent magnet generator that is mounted on transaxle. VSS produces a pulsing voltage whenever vehicle speed is greater than 3 MPH. A/C voltage and number of pulses increases with vehicle speed. Powertrain Control Module (PCM) then supplies VSS signal to instrument cluster for speedometer, odometer, electronic transaxle (if equipped) and cruise control operation.

Conditions for setting DTC:

• Vehicle speed is less than 2 MPH.
• Engine speed is 1700-3600 RPM.
• TP angle 0-1 percent.
• Engine vacuum between 80-70 kPa.
• Conditions met for 5 seconds.
• DTCs P0107, P0108, P0122 and P0123 not set.