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Not sure what you mean by rpm sensor. The signal for the tachometer comes from the PCM and is based on signals from the crankshaft position sensor, located on the right rear of the engine where the transmission bolts to the engine, but if this is bad, there are a lot more problems than the tachometer not working. There are two speed sensors on automatic transmissions, an input speed sensor and an output speed sensor. Both are located on the left side of the transmission, the input speed sensor near the front (just behind the bell shaped portion) and the output speed sensor near the rear. In addition to those there are wheel speed sensors for the ABS, located in each wheel area covered by the ABS.
make sure transmission fluid not too low.other possible causes to your problem could be faulty transmission shift solenoid or faulty input turbine speed sensor or faulty output speed sensor.could have faulty vechicle speed sensor or faulty TPS have vechicle code scan could be many things.
code p0720 refers to output shaft speed sensor(OSS)--circuit malfunction====causes--wiring--OSS sensor--ECM/TCM
of it has just happened check the wiring and connections to the transmission for water and corrosion or replace the OSS sensor in the transmission.
Sounds like a bad out speed sensor.Are you sure you replaced the correct sensor?This trans(AW340)Has an output speed sensor and a vehicle speed sensor.The output speed sensor is located on the side of tail housing just next to where it bolts to transmission case.The vehicle speed sensor will be about midway of the tail housing or on the transfer case tail housing on the 4x4 models.It may be a good idea to have a tranny shop you trust run a diagnostic and see if you are getting output sensor signal to TCM( transmission control module behind glove box)and take a look at TPS (throttle position sensor)signal when it is hot to make sure you replace the correct part.I have seen bad TPS sensors on these jeep not affect engine drivability because the sensor is really two(one for trans and one for engine)thus the two plugs on the TPS sensor for the automatic Cherokee.Good Luck and let me know if I can help.
Use the Phillips screwdriver to loosen the screw in the
intake boot clamp at the throttle body. Slide the intake boot off the
throttle body. Pull the other end of the intake boot off the air filter
Locate the Accord speed sensor at the top of the back side of
the transmission, close to the firewall. It has two 10-mm bolts holding
it in, and an electrical connector at the top. Unplug the electrical
connector by squeezing the clip at the top and sliding it off the speed
Use the ratchet, extension and 10-mm socket to remove the two bolts located on the sides of the speed sensor.
Remove the speed sensor by pulling on it. You may have to twist it back and forth to work it free. If the drive link does not come out with the speed sensor,
remove it from the transmission. The drive link is a very small part
that links the speed sensor with the transmission.
Speed Sensor Installation
Insert the drive link into the new speed sensor. Carefully
place the speed sensor onto the transmission, making sure that the drive
link lines up in the shaft.
Install the two 10-mm bolts and tighten them until they are snug.
Slide the electrical connector back onto the speed sensor until it clicks into place.
Reinstall the intake boot by sliding it over the throttle
body and air filter housing. Tighten the Phillips screw in the clamp at
the throttle body.
Start the Accord and test drive it to verify that the speedometer is working properly.
hi , their is two different speed sensors on your vehicle one is the input speed sensor which is inside the transmission and the transmission will have to be removed to replace it the other one s the output speed sensor is located directly above the passenger side trans-axle shaft. your input sensor is the sensor which tells the transmission when to shift and the output speed sensor tells the speedometer what it should display and both those parts are fairly cheap they are around 15-25 dollars but just remember if your input speed sensor is bad it is gonna cost you a minimum of 1000 dollars to have a mechanic fix as the transmission needs to be removed hope this is what you needed
It sounds like it may be you speed sensor at the transmission which is also called VehicleVelocity Sensor (VVS), The sensor or the wire harness may have gone bad and needs to be replaced, but it's a good thing to have your car scanned at Auto Zone since they scan free of charge. I just want to make sure it is the VVS and not the transmission Control Module (TCM), Check the fuse under the dash and under the hood and look for any blown fuse like the TCM fuse. Good luck and hope this helps, keep me posted
Hi, I have a trooper also, I am pretty sure if it has a speed sensor it would ;located on the transmission near the tailshaft. Not sure that will help, but mine is a standard, so I can't look for you.
or the transfer case maybe?
So the diagnostic code says the speed sensor is bad in the transmission? Make sure all the wires are tight to the transmission and in good shape. If they are you probably need to replace the sensor. If the transmission controller doesn't get the correct speed values it would cause some problems shifting. Wiring to a transmission can cause faults since the wires are subjected to heat and vibration. If you can't find any problems with the wiring or the wiring connectors it just might be the sensor is bad (stuff fails).
I do have to say that I am not sure what G-68 means. The diagnostic codes are usually five digit numbers with maybe a letter.