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John Deere 672D Transmission Shifting Problem

Input speed sensor working correctly. Output speed sensor showing errant readings between 49 and 250 RPM's with drive wheels up, in first gear... Won't come out of first gear. Why? I understand TCU can't accept this value

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

jmgldsmth
  • 1869 Answers

SOURCE: Chrysler 3.5 won`t rev past 2500 rpm?

remove the aircleaner intake hose and, check the intake air control flap for free movement

Posted on Apr 22, 2009

emissionwiz
  • 75235 Answers

SOURCE: shifting gears

the speed sensor is for Overdrive only, it does not shift the gears it sends the signal to the transmission control module that in turn signals the overdrive shift solenoid to engage/shift into OD.

Posted on May 11, 2009

centralvalle
  • 386 Answers

SOURCE: e300 1994 codes read p0720 and p0500 one is speed

try changing the drive shaft speed sensor, sounds like you have a malfunctioning drive shaft speed sensor, change sensor and reset codes and test... e 300 had this problem in 94 and 95 even when they were close to new with very low miles... please rate my help , thanks

Posted on Aug 05, 2009

Mackmech11
  • 122 Answers

SOURCE: my 2000 taurus would stay in first gear it would

if your speedometer does not work i would change the output speed sensor that would be the two wire plug that bolts on to the top of the transmission, because that speed sensor get looked at from your transmission ecm and you engine ecm. Right now the computer doesnt know how fast your going so your car has moved into SAFE MODE this mode will not let you out of first gear and if your try to go faster it will stall the car. Good luck

Posted on Apr 16, 2010

  • 432 Answers

SOURCE: 2001 dodge stratus wont shift

Good Evening, I have a dumb question. have you cleared any current or history codes in the transmission? They will default with codes in the system. Also make note on what they are. If any and we can go from there, and yes tcm would be the next place to go but more info is best as far as codes and such.

Posted on Oct 28, 2010

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1 Answer

Replaced input and output speed sensors for erratic speedometer. Now the speedometer remains at 0. Anyone have a suggestion on what else could be wrong?


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

Aug 10, 2015 | 2003 Dodge Neon

1 Answer

My 1997 mitsubishi legnum st v6 triptronic auto trans failed local garage has informed me the pump inside has failed and cant be repaired are they worth rebuilding


dont believe it,those trannys have issues,not the pump though,bing search triptronic trans and see the same problems,

tRANSMISSION CONTROL UNIT. Some of these that have these issues most of them are the Input Speed Sensor , or the reading. If its reading an abnormal rotation speed it will start the transmission at a higher gear , being it cannot properly evaluate wut speed the input shaft is turning at versus the output shaft , it cant properly modulate teh shifting pressure and this will cause the initial "clonk" when getting it into a lower selected gear.

This issue can be caused by the TCM and also the Input shaft sensor also.

Apr 01, 2015 | Mitsubishi Cars & Trucks

2 Answers

Speed sensor


Speedometer sensor measures axle(driveshaft) speed for your speedometer gauge.
Input speed sensor measures the speed of the input shaft of the transmission.
The output speed sensor measures the output shaft, the ECM compares these two signals to determine the amount of clutch slippage and adjusts parameters accordingly for optimal operation.

Feb 02, 2014 | 2002 Kia Sedona

2 Answers

Were is speed censour located


the output speed sensor is located on the transmission. while standing in front of the vehicle and looking down at the transmission you will see two rubber hoses. under those hoses you will see the input speed sensor. if you look to the right of that sensor, and you may have to look from underneath the vehicle you will see another sensor that is identical to the input speed sensor. That is the output speed sensor. The output speed sensor is the one that shows how fast you are moving on the speedometer.

Apr 05, 2013 | 2001 Chrysler Voyager

1 Answer

Check engine light po 731


Diagnostic Test Code (DTC) P0731 is a transmission fault code and has a generic description of "GEAR RATIO ERROR IN FIRST GEAR".

The Powertrain Control Module (PCM) monitors the input shaft speed and the output shaft speed of the transmission through the input and output speed sensors. The proper gear ratio will produce a predictable difference between the two sensors. This DTC sets when the expected difference differs greatly from the actual difference between the two speed sensor readings.

This can be caused by several things including:
> Defective input speed sensor
> Defective output speed sensor
> Defective connections or wiring between either speed sensor and the PCM
> Shorted speed sensor circuit
> Open speed sensor circuit
> Slipping clutches inside the transmission

Please note that Transmission Control Module (TCM) replacement WILL NOT correct for this code.

The speed sensor data must be monitored with the proper equipment and the speed sensor circuits must be verified for proper function to determine the actual cause of this fault.

Dec 04, 2011 | 1996 Plymouth Grand Voyager

1 Answer

Transmission wont shift correctly. If you drive down the road and feather the gas pedel eventually you can get the transmission to shift. We got input and output speed sensors from a junk yard and tried...


Believe it or not, but the throttle position sensor as alot to do with the shifting. Also the range position sensor known as the neutral safety switch.

Jun 19, 2011 | 2003 Dodge Caravan

1 Answer

Transmission has problem shifting have to put automatic trans into 1st to gett to go reads codePO731 on code reader any ideas?


DTC P0731 - Gear 1 incorrect ratio

Input and output speed sensors in the transmission are the most likely cause, They fail alot, relatively cheap to repair, if left ignored can burn up the transmission.

Good luck.

Feb 17, 2011 | 2000 Hyundai Elantra

2 Answers

CANT FIND WHERE THE SPEED SENSOR IS NO MY 1995 OLDSMOBILE AURORA


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

Jun 06, 2010 | 1995 Oldsmobile Aurora

2 Answers

Will a speed sensor affect the way the transmission works on a 1995 Jeep Grand Cherokee


yes it will if the trans controller does not see and input speed it will not shift out of first gear.

Oct 31, 2009 | 1995 Jeep Cherokee

1 Answer

Speed sensor for a 1996 Century


Dave,

May want to see if the parts store gave you a good sensor or not. Also May want to check and see if you have a transmission input and output sensor as well. these will also give you the same symptoms. Whatever it is, the transmission is not sending the speed signal to your ECU which is in turn not sending the right shift points until its too late causing the hard shifting and also since the ECU doesnt have a speed signal you may not get an odometer/speedometer reading (one or both may go out). Hope this gives you some direction. Good luck. Thanks for using fixya.

JC

Dec 29, 2008 | 1996 Buick Regal Olympic Gold

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