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Speed Sensor Test/Repair/Replacement

  Author: Gary L Mace (Venturous)
  Views: 12750     Votes: 3
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Speed Sensor Test/Repair/Replacement
by Gary Mace
Approved by The Venturers Technical Advisory Committee

The RSV speedometer display is electronic. If the speed display becomes erradic or not working, it could be your speed sensor needs cleaned or replaced. This article will attempt to assist with this procedure.

Symptoms:
Some symptoms that could indicate a possible malfunctioning speed sensor include:

No speed display
Erradic display (see photo below)
Cruise Control disengaging
Hitting rev limiter too early

Example of an erradic speed display caused by faulty speed sensor

Diagnosing:
If you are experiencing any of the above symptoms and suspect a faulty speed sensor, you can verify it by:

The RSV is equiped with a self diagnostic that can help troubleshoot certain monitored systems. The speed sensor is one of them. Here is how to do this.

With the kill switch ON, turn the ignition key to ON but do not start. The engine indicator light (see photo below) should come on for about 1.4 seconds.
If it detects a speed sensor failure, it will flash 4 times. It will repeat this flashing approximately every 3 seconds.

Another way to confirm a faulty speed sensor if you have access to a tachometer would be to run the engine in first gear above 2000 for 8 seconds to activate the speed limiter. Next open throttle and run the engine to 5700 rpm. If engine speed can not exceed 4875 rpm, then the speed sensor is faulty.

Repairing:
First, remove the kickstand side saddlebag as shown in this article:
Removing Saddlebags

Using a 6mm hexx wrench, remove the speed sensor screw. Gently pull the speed sensor out from the final drive housing.

Some members have found that if the speed sensor gets dirty, it will cause it to malfunction. Before purchasing a new sensor, it might be a good idea to first clean the sensor end and replace into the final drive housing then re-test.

If cleaning the sensor did not correct the problem, you then will need to replace the sensor. The part number is 4NK-83755-01-00 and is shown below:

I purchased mine through www.buckeyeperformance.com and with the Venturers discount was $69.28 in 2005

If replacement is required, next remove the kickstand-side side cover as shown in this article:

Removing Side Covers

This article shows removing the opposite side cover. The procedure is the same.

Disconnect the speed sensor from the final drive housing as previously described. Unplug the sensor wire from the white plug shown in the picture below:

Gently fish the wiring through the opening right of the fuse holder and remove. There will be a zip tie holding the sensor wiring to the drive shaft housing. Remember this location before snipping.

Now, insert the new speed sensor into the final drive housing and replace the screw. Next gently route the cable along the drive shaft housing through the holders shown in the picture below. Route the white connector through the opening right of the fuse holder and replug into the white plug. Place a new zip tie around the drive shaft housing and sensor wire as you noted as you disassembled. Be careful not to over tighten this zip tie so it does not cause a short in the wire.

At this point, it might be wise to test the sensor using the diagnostic method above or by a test ride. If all OK, reinstall your side cover and saddlebag. You are done. Have a cold one!

Last update: 08:09 PM Wednesday, October 12, 2005

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