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Home >> Volvo >> 1993 >> 850 Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - Aw50-42LE >> Component Testing >> Vehicle Speed Sensor (VSS)

Vehicle Speed Sensor (VSS)

  1. To check speed signal, connect measuring unit to TCM. See Figure. Raise and support front wheels of vehicle. Set shift lever to "N" position. Turn ignition on.
  2. Connect voltmeter between measuring unit terminals No. 20 and 48. Battery voltage should be present. Block one front wheel and spin other wheel rapidly. Voltage should be 4-7 volts. If voltage is consistently high or low, check wiring for an open or short circuit. If no fault is found, replace TCM.
  3. To check speed signal wiring to instrument panel, connect measuring unit to instrument panel 30-pin connector. Ensure ignition is off. Using a DVOM, measure resistance between measuring unit terminal No. 6 and TCM connector "B" terminal No. 18. See Figure
  4. Resistance should be zero ohms. If resistance is not as specified, check wiring circuit and repair as necessary. If resistance is as specified, check for incorrect installation of wiring which may cause interference, such as ignition wiring, mobile phone, etc.
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