The speedometer does nt work all the time. I replaced the speed sensor and that did not solve the problem. I checked and cleaned the connections to the speed sensor and still no solution. Some times it works and sometimes it does not.
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You could have a faulty speedometer/odometer combination meter causing a false Vehicle Speed Sensor error.
My 1998 Sienna had the following symptoms:
- Speedometer and odometer failed intermittently
- The check engine light would come on and I would get a p0500 code in the OBDII.
- The cruise control would stop working at the same time the speedometer failed.
There is a speed sensor in each one of the tires and they feed the speed information to the ABS ECU. From the ABS ECU the speed signal goes to the speedometer/odometer combination meter, and from there it goes to the Engine Control Module and to the Cruise Control ECU. I could see a signal coming into the speedometer/odometer, but no signal going out. Replacing the speedometer/odometer combination meter fixed the problem.
Problems arise when there is trouble anywhere in the above mentioned
functioning process. The most common ones are problems in the speed
signal sensor, as a result of which the speedometer stops working. If
you notice problems in gear transmission or find the 'check engine'
light on, it is because of a faulty speed signal sensor. In case of your
speedometer using the 'eddy current' technology, there could be a
trouble with the connecting cable which causes this problem. Ticking
noises are a sign of this problem. In either case, you will need to
replace the cable or the speed sensors to solve your problem.
It can be faulty vehicle speed sensor .The sensor connects to the differential.The sensor in the transmission that tells the instrument panel how fast the transmission is turning. Sometimes that sensor breaks. There is a speed sensor on the transmission that sends a signal to the speedometer control on the back of the instrument cluster, and diagnosis is pretty straightforward. The On-board Diagnostics Generation II (OBD II) scan tools used by professional technicians should have the ability to read the signal generated by the transmission speed sensor and therefore check the function of the speed sensor. Even if the technician's scan tool does not have this capability, the sensor can be checked with a volt meter at the sensor itself.
If the sensor is putting out the proper signal, then the next step would be to check the wiring between the speed sensor and the speedometer control by checking the signal at the wire harness at the speedometer control. If the signal is good, then the speedometer control is bad, and if the signal is bad, then the wiring between the sensor and speedometer control is bad. The most time confusing part of doing all these checks would be removing the instrument cluster to get at the speedometer control, about a half-hour total for all the checks.----------If the needle moves you have a broken pinion or counter gear.If not,
then I would replace both speedometer cables.---------------Thank you.
The first thing you can always do is check your fuses. there might a blown fuse that need replacement.The 1990 Legacy has a mechanical speedometer . The speed sensor is a read switch in the speedometer head itself. So
if your speedometer is functioning ( needle working properly ) then the
internal read switch is defective. That requires replacing the entire
speedometer OR it can be a defective connection between the speedometer and the
ECU.If the speedometer is not working, then you can
have a defective speedometer, cable, speedometer cable adapter ( on the tranny
) or internal speedo gear in the tranny.Thanks. you can rate this solution and show your appreciation.
Check the Vehicle Speed Sensor (VSS), it is located on the transmission at the rear of the engine. The first to look for is a faulty connection to this sensor, sometimes cleaning the connector and putting it back solves the problem. If this does not solve this issue you might ask your mechanic to replace it, shouldn't be too expensive as is a common part to fail.
Does the transmission shift erratically sometimes?
Most likely a speed sensor is going bad (most cars and truck do not use mechanical speedometer cables anymore) most sensors are located near the differential in rwd cars or near the drive shaft on the transmission. Best bet is to get a Haynes manual for your car to help locate the speed sensor. Remove it and take it to the auto parts store so you can visually compare it to the replacement. Install the new speed sensor and it should restore your speedometer and odometer.
does your cruise control work? If not, check the wiring from the VSS to the speedo cluster. Check VSS connector closely for pin pudhout or corrosion
Sometimes, the VSS siganl is converted by the instrument cluster and sent to the PCM and speedo.
Check engine light on?
The electronic speedometer (17255) receives a speed signal from the vehicle speed sensor (VSS) (9E731). This sensor is also used to sense vehicle speed for the engine management system and to regulate the cruise control when equipped.
Vehicle Speed Sensor
The Vehicle Speed Sensor (VSS) (Figure 53) is a variable reluctance or Hall-effect type sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.