Code 452, no VSS input

Tiny
TAMILLER2CARPRO
  • MEMBER
  • 1995 FORD E-SERIES VAN
  • 7.5L
  • V8
  • 4WD
  • 147,000 MILES
E4OD is transmission shifting rough. Code 452, 632 from KOEO/KOER. I cannot find a VSS on the transmission. There is a hole for one that is plugged and not used on the transfer case. My speedometer works fine. Is the PCM getting its VSS signal from the rear axle VSS? Would the speedometer not stop working then?
Tuesday, January 2nd, 2018 AT 11:50 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,478 POSTS
Hello,

The PCM gets its signal from the transmission/transfer case output shaft speed sensor. Here is a test guide to check out the performance of the sensor.

Check out the diagrams (Below)

Please run this test and get back to us.

Cheers, Ken
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Wednesday, January 3rd, 2018 AT 8:12 PM
Tiny
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My van has a Quigley 4wd conversion. My manuals for the unconverted van show no second VSS (only the one on the rear diff). The manual schematics show the rear diff VSS signal passed to the PCM through the PSOM modual. As I mentioned before, the hole for one near the ouput shaft is plugged; no sensor. There is a sensor on the transfer case (it's a Borg-Warner 1356 I believe) that was installed by Quigley but the Borg-Warner documentaion shows this sensor to be a 4wd indicator light. Is it possible that the indicator light sensor was replaced with a VSS? The speedometer stops working if I disconnect the VSS on the rear diff so there must be a second one somewhere but the only thing I can find is the sensor on the transfer case. Is there a way to determine if it is a 4wd indicator switch as opposed to a VSS?
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Sunday, January 7th, 2018 AT 10:55 AM
Tiny
KEN L
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There might not be a second VSS sensor, they can be using the signal sensor to run the system which is what I suspect. Is your van obd2 or 1?
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Monday, January 8th, 2018 AT 9:44 AM
Tiny
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Obd1
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Monday, January 8th, 2018 AT 12:02 PM
Tiny
KEN L
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Here are the transmission and VSS wiring diagrams and it looks like there is a few fuses that should be checked before we got further.

#1, 5, 18, U and C Here is a guide

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are okay check the wiring here is a guide and the wiring diagrams (Below)

https://www.2carpros.com/articles/how-to-check-wiring

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, January 8th, 2018 AT 12:18 PM

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