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Having VSS  troubles? You've come to the right place for VSS  solutions.



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 Vehicle Speed Sensor (VSS)- Inspection, repair, replace.  DO IT YOURSELF 


How to repair or replace
The purpose and function of a VSS - In short
The Honda Speed Sensor's main purpose is to transmit speed data to the TCU. It is reading the frequency of a bobbin that is attached to upper casing that speeds past the solid state sensor. The bobbin is a cylindrical or spool-shaped coil or insulated wire, usually containing a core of soft iron which becomes magnetic when the wire is traversed by an electrical current.  The faster the wheel spins, the faster the frequency the wheel magnet moves past the sensor thus the higher speed reading on your speedometer. The vehicle speed sensor counts the revolutions of the transmission output shaft. For a given vehicle, the Transmission Control Module considers a certain number of revolutions to equal a mile. A defective speed sensor can either set off the "S" light or fail to engage the cruise control, which also can affect other system controls. The result is that the TCU thinks the vehicle is running at zero speed from what itís actually doing. The first thing most customers notice is a transmission error code or intermittent reading on the speedometer which reset the error code after every ignition cycle. 

SCHEMATIC

 

The first step is to check the connection for any deformation, corrosion or other visible signs of connection damage.  The next step is to jack up the car and take voltage readings (5V) pulses at the connector when the front wheel is turn by hand. If no pulses are found, confirm input voltages then inspect the inside of the VSS. Unplug the VSS and remove the 10-mm bolt(s.)  Remove by lifting and twisting the unit upward.

LOCATION

VSS located on top of transmission housing.Figure 1

 Remove the VSS's two screws and gently lift the top off for inspection. Caution: DO NOT allow the spring to fall.

OVERHAUL

A new conducting surface should show no signs of wear.Figure 2

Inspect for signs of wear between the conducting rod and the conducting surface. The rod can be rounded off with a 400 grit sandpaper. The conducting surface can be treated the same way. Note: Add conducting grease to the treated areas when done. 

Slightly improved conducting surface, how long it will last is unknown.Figure 3

The new, improved surface should appear smooth.

TOOLS REQUIRED

Figure 4

SO -YOU STILL DON'T HAVE SPEED READINGS

Trash the unit.

 KNOWN GOOD READING

 

  

 

 

 
   Ľ upadated 12/2/2004
 

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