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The routing of the speed sensor wires is located on the rear differential. The problem is that they rub on the E-brake cable and once the wire is exposed they short and the speedometer and any other options running off the speed sensor quit working and that includes the transmission shift points and can cause the torque converter to not unlock and cause stalls. We went to a dealer and got the replacement kit for $32.00. He also took the time to encase the wires in a plastic tubing to avoid this problem again.
Speedometer cable may have broken. You can't tell from the outside of the cable, since it has a plastic shield. You have to disconnect it from the transmission to check it. If you can turn the cable inside the shield easily, it is broken.
wiring from the sensor on the rear diff ? What sensor ?
The insturment cluster get's speed info over the PCI bus ( serial data network ) from the PCM - engine computer . The VSS - vehicle speed sensor is located on the transmission . The VSS is a input to the engine computer . Sorry , don't know who told you that . That is not correct . You should have it diagnosed at a qualified repair shop . Your insturment cluster or data network is probably at fault . Does the vehicle shift ok ?
The only sensor that mite be on the rear diff ,could be for the ABS ,an that has nothing to do with the speedometer .
Have the vehicle checked for DTC'S - diagnostic trouble codes .
I assume you replaced the input and output speed sensors on the transmission?
The speed sensor for the speedo is located in the rear differential. Look on top of the center of the rear differential and you should see a sensor bolted to it with two wires. Check the wiring harness to the sensor. Sometimes they rub through on the E-brake cables. If the wiring is good replace the sensor in the rear differential.
A couple of things could be wrong a bad oil pressure sensor, a short in
the sensor wiring,low idle oil pressure. Checking this is simple on
While disconnecting the sensor from its wired connector
and the light stays on is a short in the wiring, if it stays off its
hopefully a bad sensor. Before just replacing the sensor I would either
buy a gauge to check the pressure at the engine and thus checking the
sensor also. I HATE DUMMY LIGHTS!!!
Gauges are simple, easy to install
and easy to see a problem before engine damage occurs. On the bad end
of the spectrum of possible problems the oil pump may be worn out, or
even the engine may be worn out to the point oil pressure loss at low
idle or while oil is sloshing forwards at stop signs.
thats correct, may have bad ecm (computer) or bad wire to crank sensor from ecm, also ive run into this problem and it was the new sensor i put in was no good and aftermarket,also cam sensor can do this, and also make sure the 5 volt feed wire is good,good luck hope this helps.
Jeep Liberty 2002 woahs ! by porth21 - 2/1/09 7:35 AM In reply to: Jeep Liberty 2002 speedometer not working by Dannywon I have a 2002 Jeep Liberty Limited with the same problem. The main problem I have found to be the routing of the speed sensor wires located on the rear difrential. They are 2 blue wires on my jeep and probably the same on yours. The problem is that they rub on the E-brake cable and once the wire is exposed they short and the speedometer and any other options running off they speed sensor quit working and that includes the tranny shift points and can cause the torque converter to not unlock and cause stalls. I am having the same problem for the third time and chrysler and jeep are both aware of the problem and unwilling to repair the problem or post a recall.