After rebuilding a transmission on 96 mercury sable, car still will down shift to low from drive. Speed odemeter quit working and cruise quit working. Any ideas
Re: After rebuilding a transmission on 96 mercury sable,...
Have you tried replacing the speed sensor? Also is your car a column shift or floor shifter? If it is a column shifter make sure to inspect your linkage between the shifter and the tranny.
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Check the
Vehicle Speed Sensor
The vehicle speed sensor (VSS) (Figure 43) is a variable reluctance or Hall-effect 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. That same VSS signal is use for the tachometer as well !
There is a Vehicle Speed Sensor (VSS) mounted on the transaxle, that is a good place to start. The VSS tells the powertrain management system when and how to shift the transmission and also gives the speedometer it's signal.
From your description that the speedometer quit working at the same time I would suspect the a faulty VSS.
most likely you need to replace the speedometer sensor..it control the transmission shifter by sending the signal to the pcm and the pcm to transmission shift solenoid..that why it don't shift right
Most of the time its the wires going to speed sensor. Passenger side rear of engine, under altenator (way down). My shoop usaully only charges about $75 to fix that issue.
possible speed sensor at rear of transmission,does engine rpm sound higher then narmal,and is your trans shifting as it should,if these problems are also present replace the speedometer sensor at rear of trans,$50 to 60 bucks
VSS (vehicle speed sensor) Tells the PCM (computer) the speed of the vehicle so the PCM can make the proper information to the TCM (transmission control module) to shift.
YOU are goin gto need a scan tool NOt a code reader to monitor the VSS to see what it is putting out for speed when the car is moving But I believe you need a VSS but do not not Go out and buy one until you have had it tested , and can positively confrim it is bad first. Please rate this a fixya if you find this advice helpful, Thanks Randy
I hace a 19196 sable-the problem is the transaxle speed sensor-this part sends all speed info to the computer ..-First symptom(speedometer stops working and then transmission shifts erratacially and power steering becomes hard and engine light comes on..The computer on this all eletronic car cannot send proper signals to the speedo-trans-power steering and other functions without knowing how fast or slow the car is going..Have the SPEED SENSOR mounted on top of the tranaxle replaced and all will be well.Part is not to expensive.labor can vary depending whether you have 3.0OHV or DOHC engine-some cars have to have exhaust dropped to get at it-Good Luck All
i have 1996 mercury sable wagon has elecrical problem and it cause to stall when am driving as soon i stop and sometime the gas without step on goes high and then low like it goes off.also running light when i shut the car still on so [please someone help
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