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Re: 1991 s10 chey pickup speedometer problem
As a RULE I NEVER replace Electronic parts with used parts, you dont know what you have in a used Spedo head. Possible that Magnetic pickup at transmission is good. A Problem like this on MY Personal Vehicle I would go with ALL New parts Including Wires.
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input and out put speed sensors tell the TCM and the ECM the difference between engine rpms and transmission input roms so that the correct gear ratio can be selected
A speedo sensor reads the out put shaft (drive line ) shaft and refers to road speed for speed and odometer readings and to calculate the fuel consumption rate
it is possible that you have replaced the wrong sensor
Talk with an accredited transmission specialist shop and have the problem diagnosed
You may need another speedometer. The speed sensor sends a signal to both the speedo and the odometer. So if the sensor fails, both meters would stop working. The speedo gets power from the same circuit as the warning lights.
Troubleshooting Speedometer Problems Speedometer Cable Replacement Take out the engine cover and doghouse to remove the speedometer cable from your car. Take out the bolt from under the dashboard, so that you can easily access the old speedometer cable. Also remove the nut on the rotating shaft and pull the speedometer cable out through the passage. Remove the clamps present on the transmission and engine compartment.
Once you have removed the old speedometer cable from your car, you need to replace it with a new one. In the adapter, fix the square end of the new cable and also tighten the nut on the rotating shaft. Pass the new cable through the passage and tighten the bolt at its rear end. This end should be fixed at the speedometer's square hold. Fix back the clamps you earlier removed and also put back the engine cover.
Speed Sensor Replacement for Front Wheel Drive Vehicles You will find the speed sensor behind the engine above the trans-axle. Take out the connecting hose, air cleaner and electrical connector from above the sensor. With help of a 10 mm socket, take out bolts keeping the sensor in place. Simply twist the sensor to take it out. Fix the new sensor in place and tighten bolts around it. Attach back the hose, air cleaner and the electrical connector on to the sensor.
Speed Sensor Replacement for Rear Wheel Drive Vehicles You will find the speed sensor on the driver's side behind the transmission. Raise the vehicle up from the driver's side and put a jack stand below to hold it there. Disconnect electrical connectors present on the sensor and take out bolts keeping the sensor in place, using a socket. Take out the sensor carefully and fix a new one in its place. Attach the electrical connector to it and tighten it.
Not every speedometer not working problem needs a replacement job. It depends on the cause. In case the dial is the problem, you can easily replace it alone. Problems with the little computer reading sensor signals call for the computer to be replaced. It is therefore important for you to take your car to a car mechanic and diagnose the predicament, before jumping onto any conclusions and trying to solve it yourself.
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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 odometer quits working when the speedometer quits working. The most common cause for the speedometer to quit working is the speed sensor in the transmission. You said you replaced it, there is also a transmission speed sensor on your truck that may need to be replaced. I understand your frustration, but there is nothing else that would cause the speedometer to quit except the cable behind the gauges being clogged.
Your vehicle does not have a traditional speedometer cable. Instead it uses a VSS (Vehicle Speed Sensor) to read speed of the vehicle below is a short test to help you determine if it is the VSS that has failed.
SPEEDOMETER VEHICLE SPEED SENSOR TEST
1. Press and release trip odometer button until function number 6 appears in display window.
2. Turn a front wheel and observe display (pulses are added to number in display. Check impulse signal for speedometer vehicle speed sensor. If 7 pulses are generated per wheel revolution, vehicle speed sensor is okay.
3. If specified number of pulses are not generated, check for open in wiring harness between speed sensor and instrument cluster. Repair wiring harness if necessary. If wiring harness is okay, replace speedometer vehicle speed sensor.