Code 452, VSS issue?

Tiny
KELLER1966
  • MEMBER
  • 1995 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 86,000 MILES
Obd1 code 452, shifter stalk flashing OD light.
No noticeable shifting problems in transmission.
Slight sweeping of speedometer gauge above 60MPH.

Same issue about a year ago, replaced transmission output sensor (OEM / Interchange Numbers: F4AZ7H103A).

Code returned after drained battery, jump start and drive to get battery replaced.

Assumed cheap aftermarket sensor, replaced again. Light still flashing, same 452 code.

No other codes present.
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Saturday, November 12th, 2022 AT 4:13 AM

12 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Is this the only code present? As far as the code, it indicates there is an error in the programable speed/odometer module. Because this can be caused by a few different things, we need to work through a few tests.

The problem is my manual provides one procedure and then based on the outcome; it sends me to the next.

Do me a favor. Take a look at the first step below and let me know if you are comfortable performing it. If you are and complete it, let me know the results.

Take care and let me know what you find.

Joe

See pics below.
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Saturday, November 12th, 2022 AT 9:28 PM
Tiny
KELLER1966
  • MEMBER
Thank you for replying,
I do not have a breakout box; can this be measured from pins 3&6 on the PCM connector?
I should have mentioned in my request for help that I have a spare PCM (cardon reman) and have tried that with no change.
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Sunday, November 13th, 2022 AT 4:18 AM
Tiny
KELLER1966
  • MEMBER
Checked at PCM connector with one auto ranging and one set at 20k.
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Sunday, November 13th, 2022 AT 12:08 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I attached the next two steps because the outcome can either require more testing or it can be an open circuit that needs to be repaired.

Let me know.

Joe
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Sunday, November 13th, 2022 AT 4:45 PM
Tiny
KELLER1966
  • MEMBER
Thank you. I won't be able to get to this test until Friday.
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Tuesday, November 15th, 2022 AT 7:15 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Thanks for letting me know. If possible, let me know over the weekend.

Take care,

Joe
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Tuesday, November 15th, 2022 AT 7:19 PM
Tiny
KELLER1966
  • MEMBER
It has been raining most of the weekend here in Central Florida, won't be able to get to that test till the 23rd.
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Sunday, November 20th, 2022 AT 11:08 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

No problem. When you get the chance, let me know. I'm interested in knowing what you find.

Take care and if I don't hear from you, have a nice Thanksgiving.

Joe
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Sunday, November 20th, 2022 AT 8:23 PM
Tiny
KELLER1966
  • MEMBER
Thank you, Joe, for being patient with me, continuity and short to ground pin check is good.
PCM 3 to PSOM 5= 0.3ohm
PCM 6 to PSOM 7= 0.4ohm
PCM 3 to PCM (6, 37, 40) OL
I have included the connector pinout I have been using with this test.
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Sunday, November 27th, 2022 AT 7:45 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Based on the results, we have a short. The manual is suggesting that everything be reconnected and then rerun the quick test.

Starting with pic 2 is where it goes next. Let me know what you find.

Let me know what you find or if you have other questions.

Joe

See pics below.
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Sunday, November 27th, 2022 AT 6:38 PM
Tiny
KELLER1966
  • MEMBER
At what step determined a short. I would like to recheck that step before I continue. I thought my results would lead to test DS4, checking the RABS module.
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Tuesday, November 29th, 2022 AT 1:31 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:

checking for a short to power or ground was done in the first portion of the diagnostics. I reattached it below.

Let me know if this helps.

Take care,

Joe

See pic below
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Tuesday, November 29th, 2022 AT 7:31 PM

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