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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.
my scion xb is at the dealership right now because i heard the same noise coming from the rear tires, i was told today that both my rear wheel bearings were bad and have to replace them, $300 plus each for the part alone, $500 for with labor.
NO code ? the first thing is to make sure all the fuse are good, the next thing is to connect a scan tool and check for readings to speed sensors.
Some of these use the wheel speed sensors to control the speedo and abs , the speed sensors in the transmission are used to control gear shifting, make sure the wheel sensors are working, the most common problems are the wiring to the rear sensor and the rear sensor itself, check on the rear end on the top and make sure connection is good and maybe replace that sensor and see what happens, i have run into this problem a few time but some were diffrent. one was a bad rear speed sensor another one was the cluster and the last was the abs module.
I would start with checking all the fuses first, then move on to replacing the rear speed sensor located on the rear top of the diffrential . good day.
most likely you have a bad wheel speed sensor or a broken wire to the wheel speed sensor. you will need it scanned to find out which sensor is acting up. if it is a broken wire it usually will be for a front wheel speed sensor from all the turning and it should be with in the first 6 inches or so from the sensor. to replace sensor you must replace front wheel bearing sensor assembly.
CHECK ABS FUSE AND RELAY.THE AWD CONTROLED BY SPEED SENSORS ONE IN THE FRONT OUT PUT SHAFT SECOND SPEED SENSOR IN THE REAR OUT PUT SHAFT THIRD SPEED SENSOR IS VECHICLE SPEED SENSOR.BEST TO HAVE VECHICLE FIX AT A GARAGE OR DEALERSHIP YOU WILL NEED DIAGNOSTIC EQUIPMENT TO WORK ON IT.
I do not beleive that there is a specific test for the speed sensors that measure the resistance of the sensor, if there is you should be able to measure the opposite wheels and figure out what it should be.
The best way to figure out what sensor is bad is to have it scanned, it may not be a sensor at all.
There are several TBS's and recalls on the wheel speed sensors, call a dealership and find out if yours qualifys.
Technical Service Bulletins
All Technical Service Bulletins:
Number Date Name
03-05-25-007C May 06 Brakes - Low Speed ABS Activation/No DTC's Set
04094 Jan 05 Recall - Front Wheel Speed Sensor Corrosion
05068C Mar 08 Recall - Possible Front Wheel Speed Sensor Corrosion
NHTSA05V379000 Aug 05 Recall 05V379000: Wheel Speed Sensor Cleaning
IF YOU HAVE FOUR WHEEL ANTI-LOCK BRAKES YOU MITE HAVE I FRONT WHEEL SPEED SENSER GONE BAD OR A POSSIABLE WHEEL BEARING GONE BAD (BECAUSE ON SOME FORD TRUCKS THE WHEEL SPEED SENSER READS OFF THE WHEEL BEARING.
2001 Pontiac Grand Am 2.4L SFI DOHC 4cyl Vehicle Speed Sensor - Location: The speed sensors are built right into the wheel bearings of your vehicle, at the front and rear locations. They work
both with the anti-lock brakes and with the traction control systems on
Removal & Installation Front The
front wheel speed sensor is part of the hub/bearing assembly. Refer to
Wheel Hub and Bearing Replacement in Front Suspension for service
procedures. Rear The rear wheel speed sensor is part of
the hub/bearing assembly. Refer to Wheel Hub and Bearing Replacement in
Rear Suspension for service procedures.
I hope help you with this (remember rated this help) Have a nice day, good luck.
2006 Saturn VUE AWD, same issue - only it was very intermittant and happened at very slow braking (like rolling to a stop sign) when it kicked in. Turned out it too was the wheel speed sensor. Although I had to take it to the dealership 2x, the first time they checked engine codes with no avail, and a visual inspection didn't show anything either. It was only when I happened to take it there on a day that it was happening frequently. They actually had to hook up the diagnostic computer, drive around, and get readings from the speed sensor to confirm it was shot.