Speedometer/Odometer and Trip meter not working

TWILSON636

MEMBER
1999 FORD TAURUS
3.0L
6 CYL
FWD
AUTOMATIC
153,238 MILES

Speedometer/Odometer and Trip meter not working. Replaced Vehicle Speed sensor and still no change. Transmission shifts roughly an am told this is a sign also of Vehicle Speed Sensor (VSS) not working. I have checked all fuses visually and with multimeter to ensure working. All else on car is working. Code came up for Speed Sensor and O2 sensor but otherwise clear. I would like to test the connector of the VSS but do not know what the voltage should be and also check the VSS for resistance, again unknown values. Everything I have seen on the internet shows a VSS with a gear that spins, this is not the one that I have. Mine looks like this one from Autozone. See Picture.

Image (Click to make bigger)

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

The vss is a signal generator. Just ohming it out will not tell you if it is good. Around 800 ohms is normal.

The real way to check is to use a scan tool and monitor the vss and see if it is generating a signal and sending it to the pcm.

Roy

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Wednesday, May 5th, 2021 AT 12:11 PM

TWILSON636

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4 POSTS

What kind of scan tool? I have an OBD II scanner, but it is only for Key on engine off. Will this work?

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Wednesday, May 5th, 2021 AT 12:11 PM

TWILSON636

MEMBER
4 POSTS

Also, do know it there is more than one speed sensor on this car and where the second is located? I found the VSS on the driver's side.

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Wednesday, May 5th, 2021 AT 12:11 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

A code reader will not work. You need a real scan tool.

The vss is on the passenger side or the output shaft on the right side by where the axle goes in.

Roy

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Wednesday, May 5th, 2021 AT 12:11 PM

TWILSON636