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Old 05-15-2008, 09:21 PM
devriesj39 devriesj39 is offline
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output speed sensor

my 99 superduty with the 7.3 has had the over drive light blinking so i checked the codes on it and p0720 came up which is the output speed center malfuntion. i was wondering where that is located and if it is the same thing as the vss. thanx
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Old 05-16-2008, 05:17 AM
JOE-M JOE-M is offline
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I believe it is. It is on the top of the differential.
Joe
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Old 05-16-2008, 07:07 AM
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The output speed sensor is on the rear of the transmission. The VSS is a different sensor.
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Old 05-16-2008, 03:05 PM
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P0720
Insufficient input from Output Shaft Speed sensor

Detailed Description
The output shaft speed sensor inputs a signal to the PCM, based on the speed of the output shaft of the transmission. The PCM compares this signal with the signal of the VSS or TCSS and determines correct tire size and axle gear ratio.
Possible causes :-
  • OSS sensor circuit short to GND.
  • OSS sensor circuit short to PWR.
  • OSS sensor circuit open.
  • Damaged OSS sensor.
  • Damaged PCM.
  • Diagnostic Aids
    Verify sensor signal output varies with vehicle speed.


    Output Shaft Speed (OSS) Sensor
    The output shaft speed (OSS) sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the powertrain control module.
    The output shaft speed (OSS) sensor is mounted externally on the top of the transmission case. The PCM uses the output shaft speed (OSS) sensor signal to help determine electronic pressure control (EPC) pressure, shift scheduling and torque converter clutch (TCC) operation.
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    Old 05-18-2008, 11:09 AM
    devriesj39 devriesj39 is offline
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    thanx for all the info
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    Old 05-18-2008, 09:21 PM
    devriesj39 devriesj39 is offline
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    how can i get to it?
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    Old 05-18-2008, 09:33 PM
    Mark Kovalsky's Avatar
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    Get under the truck, go to the back of the trans. The sensor is on the extension housing at the back of the trans.
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    Old 09-02-2008, 03:54 PM
    marty722 marty722 is offline
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    p0720 error code

    I had this error on my 2000 bounder ford motorhome and replace the sensor as the error code was p0720 output speed sensor circuit and we took one trip and it started to happen again. The overdrive light on the shifter starts to blink then the check eng light soon comes on and I have very low power when stepping on the gas. It feels like it won't move. Does anyone have any other ideas that may be causing the problem? Thanks for any help.
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    Old 09-03-2008, 07:32 AM
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    The code doesn't necessarily mean the sensor is bad. It means the reading from the sensor is bad. It could be the sensor, the wiring to the sensor, or the tone wheel inside the trans that the sensor is reading.
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    Old 09-03-2008, 11:38 AM
    marty722 marty722 is offline
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    tone wheel

    Mark

    Thank you for your help, Is there anyway of testing the tone wheel ?
    I'm disablied and can only do so much under the motorhome. Any help with info would be great.

    thanks again.

    Marty
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    Old 09-03-2008, 12:31 PM
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    It isn't likely to be the tone wheel, but I threw it out there because it is possible. Usually these type of problems are damaged or corroded wiring.

    Someone might be able to inspect the tone wheel by looking in the hole where the OSS goes, but the driveshaft would have to be rotated one entire rotation to see each tooth. The better way is to remove the driveshaft and the extension housing from the back of the trans.
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    Old 09-03-2008, 02:16 PM
    marty722 marty722 is offline
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    wiring

    Thanks for the input, I will check the wires first then I bought another sensor. I will see how that goes. Thanks again for the info.
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    Old 09-07-2008, 09:43 PM
    devriesj39 devriesj39 is offline
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    where can i find the oss? every where i look just has the vehicle speed sensor
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    Old 09-08-2008, 07:37 AM
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    I'm sure a Ford dealer would have it.
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    Old 09-08-2008, 09:18 AM
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    mine 02 was throwing that code awhile ago every time i washed it with a pressure washer to get some of the mud from the underside! it would kill the motor everytime i stopped moving so i let it sit for couple hrs and everything would be fine! im guessing its a short somewhere
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    Old 09-08-2008, 09:18 AM
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