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Re: vss vehicle speed sensor
Access is easiest from below. on the manual transmission you will have to jack up and support the car, remove the left front wheel and wheel arch liner. the sensor is located next to the right hand drive shaft at the rear of the transmission. disconnect the wiring plug from the top of sensor, pull out retaining pin, noting how it is fitted, pull sensor out and recover O-ring seal if damaged replace with new. watch out for a little oil spillage . fitting is reversal of removal
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? 7:17 www.youtube.com/watch?v=y0823ZDqxiU Aug 12, 2010 - Uploaded by Larry W
Changing the VSS on a 99 Ford Taurus 3.0L Duratec 24Valve DOHC engine. Symptoms: ... Replacing VSS Vehicle Speed Sensor. Larry W.
If you are talking about the VSS (Vehicle Speed Sensor) , it relays to the ECM (Electronic Control Module) what the vehicle speed is so that it can manage fuel mixture and transmission shift points as well as ignition timing. On some vehicles it also is used for the ABS system and for the cruise control and to make speedometer readings.
The VSS is located on the transmission and sends a pulsing voltage signal to the ECM which is converted to miles per hour. This sensor mainly controls the operation of the TCC system, shift light, cruise control and activation of the EGR system.
To test the VSS, backprobe the VSS terminals with a high impedance voltmeter (set to the AC voltage scale).
Safely raise the entire vehicle using jackstands, so the wheels can rotate freely. Make absolutely sure the vehicle is stable.
Do not perform this procedure in a closed area. If the vehicle were to fall from the jackstands during the procedure, it could travel on its own, possibly causing severe bodily injury, as well as property damage.
Start the vehicle, and place it in gear.
Verify that the VSS voltage increases as the drive speed increases.
If the VSS does not produce any AC voltage, or the voltage does not change according to vehicle speed, it can be considered faulty.
REMOVAL & INSTALLATION
See Figure 1
Fig. Fig. 1: The VSS is usually located in the right rear of the engine compartment-2.3L engine
Disconnect the negative battery cable.
Raise and safely support the vehicle.
Detach the VSS lead from the transaxle.
If necessary, unfasten the governor housing bolts, then remove the housing.
Unfasten the bolt or screw and retainer, then remove the VSS assembly from the vehicle. Remove and discard the O-ring.
Lubricate a new O-ring with sychromesh transaxle fluid part no. 12345349 or equivalent, then install on the sensor.
Install the VSS assembly, then secure with the retainer and bolt/screw.
If removed, install the governor housing and secure with the retaining bolts.
sounds like your vehicle speed sensor is broken. here is a tutorial from autozone.com
The vehicle speed sensor is made up of a coil mounted on the transmission and a tooth rotor mounted to the output shaft of the transmission. As each tooth nears the coil, the coil produces an AC voltage pulse. As the vehicle speed increases the number of voltage pulses per second increases.
See Figure 1
To test the VSS, backprobe the VSS terminals with a high impedance voltmeter (set at the AC voltage scale).
Safely raise and support the entire vehicle using jackstands. Make absolutely sure the vehicle is stable.
Start the vehicle and place it in gear.
Verify that the VSS voltage increases as the drive shaft speed increases.
If the VSS voltage is not as specified the VSS may be faulty.
Fig. Fig. 1: Vehicle Speed Sensor (VSS) and vehicle speed signal buffer wiring diagram
It probably only needs a new VSS (vehicle speed sensor). Since the ABS uses the wheel speed and vehicle speed to determine ABS operaton, is makes sense that the ABS light is on if the VSS failed. The computer also uses the VSS to operate your speedometer.
The speed sensor will be about $40-70 for a manual transmission and about $70 for the automatic transmission. You'll find the speed sensor in the transmission near the CV axles. It is likely you'll be able to reach it yourself and that'll save you money and a trip to the shop.