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VEHICLE SPEED SENSOR (VSS) INSPECTION

BHE051319200W08

  Caution

  • Water or foreign material entering the connector can cause poor connections or corrosion. Be sure that water or foreign material do not enter the connector when disconnecting it.

## Visual Inspection

1. Remove the VSS. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION.)

2. Make sure that the VSS is free of any metal shavings or particles.

  • If there is any malfunction, clean them off.

3. Install the VSS. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION.)

## Element inspection

1. Verify using an oscilloscope that the wave pattern for the VSS signal that is input to TCM terminal 2K is the same as the reference wave pattern.

  • If the actual pattern of the VSS signal is not the same as the reference pattern, inspect and repair the following items:

Wave pattern | Malfunction cause
--- | ---
No wave pattern (fixed at HI) | • Open circuit between VSS terminal (A)-TCM terminal 2K • Open/Short circuit between VSS terminal (B)-battery
No wave pattern (fixed at LO) | • Short circuit between VSS terminal (A)-TCM terminal 2K
Wave pattern HI is too low | • Harness malfunction between VSS terminal (A)-TCM terminal 2K • Insufficient output from the VSS
Wave pattern LO is too high | • Poor connection (loose GND) between VSS terminal (C)-TCM terminal 2K
Wave pattern too wide/narrow | • Metal shavings (foreign material) on VSS • Parking gear rotation fluctuation

  • Connected terminals: 2K (+) and 2M (-)
  • Equipment setting: 5V/DIV (Y): 2.5 ms/DIV (X)
  • Measuring conditions: M range, 1st gear at 20 km/h {12 mph}

2. Verify the wave pattern of the VSS signal again, and if the malfunction is not resolved, replace the VSS.