24 VSS Circuit - No Signal

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Description

Vehicle speed values are provided by the vehicle speed sensor (VSS). The sensor is a permanent magnet variable reluctance sensor (VRS) mounted on the differential area of the transaxle converter housing. The PM generator produces a pulsing voltage whenever vehicle speed is above 5 KPH (3 MPH). These pulses occur 16 times per each revolution of the differential housing and are translated to provide vehicle speed in miles per hour.

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Code Parameters

Code 24 will set if:

  • The VSS indication is less than 1.6 KPH (1 MPH).
  • The engine speed is above idle.
  • The MAP indication is less than 0.5 V.
  • Vehicle not in park/neutral
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Diagnostic Aids

  • When attempting to diagnose an intermittent problem, use the Scan Tool to review supplemental diagnostic information.
    • The supplemental data can be used to duplicate a problem. Select MALF History from Scan Tool EC menu.
  • Check the tightness of the female terminal grip with a spare male terminal.
  • The speedometer will not work if the VSS subsystem has failed.
  • If VSS reading is accurate and speedometer is incorrect, diagnose the Instrument Cluster.
  • VSS resistance 700 - 900 ohms.
  • If problem is intermittent wiggle wires while monitoring VSS signal on scan tool and watch for signal to jump or for loss of signal
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