94 f150 5.0 code 452 ???
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Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Code 452: "Computer detected an error in the VSS or PSOM signal during the last 80 warm-up cycles."
Based on my recollection of past posts it's almost never the VSS.
Do the speed and ODO functions display normally all the time? If you ever see any glitches then you may have cold solder joints in the speedo or PSOM or dirty/corroded connectors somewhewre in the speed signal chain. That chain goes from the rear diff or transmission sensor to the RABS module then to the PSOM module on the rear of the speedo cluster(which drives the gauges) and then on to the PCM.
Based on my recollection of past posts it's almost never the VSS.
Do the speed and ODO functions display normally all the time? If you ever see any glitches then you may have cold solder joints in the speedo or PSOM or dirty/corroded connectors somewhewre in the speed signal chain. That chain goes from the rear diff or transmission sensor to the RABS module then to the PSOM module on the rear of the speedo cluster(which drives the gauges) and then on to the PCM.
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