Pieloux Posted September 1, 2021 Share Posted September 1, 2021 Yesterday I did a KOEO test with my Innova code reader. No self test codes (except 111) but the following codes were displayed in the continuous memory : 452 (VSS signal fault) and 628 (converter clutch slippage). To be sure, I erased the codes, went for a drive and did the test again. The same DTC were displayed. I also noticed that shifting was very harsh and noisy espacially from P to N and N to D. Could the faulty VSS be the reason for code 628 ? Could it be a problem with the solenoids pack or the valve body ? Thank you for your feedback Pieloux 1995 Contour SE (V6 & ATX) Link to comment Share on other sites More sharing options...
BuckeyeSVT Posted September 2, 2021 Share Posted September 2, 2021 Generally a shorted VSS can cause the 452. I would start with the easy code before diving into the 628. Inspect the VSS harness for frayed or bare wires (common) and repair/replace as necessary. -Dominic Link to comment Share on other sites More sharing options...
Pieloux Posted September 3, 2021 Author Share Posted September 3, 2021 Thank you. Due to the age of the vehicle, I am going to replace it. Once it is done I will run the car, see how the transmission reacts and perform a KOEO. Pieloux Link to comment Share on other sites More sharing options...
Pieloux Posted September 7, 2021 Author Share Posted September 7, 2021 VSS removal and installation (1995 V6 with CD4E & no speedometer cable). Has this topic already been discussed ? Pieloux Link to comment Share on other sites More sharing options...
Pieloux Posted September 11, 2021 Author Share Posted September 11, 2021 Just a question : Are main valve bodies RF3 and RF7 interchangeable ? My car being a 1995 model, I would assume that the valve body is a F3. Thks for your assistance. Pieloux Link to comment Share on other sites More sharing options...
BuckeyeSVT Posted September 11, 2021 Share Posted September 11, 2021 I don't have enough information to answer that question properly, however it appears the valve bodies are matched to the production date of the transmission itself. The RF3 and RF7 are the valve body casting revisions. And it looks like (RF3) 1995-1997, (RF7) 1998-2000 is how they break down. I don't know if you can swap them as I've never attempted it before. -Dominic Link to comment Share on other sites More sharing options...
Pieloux Posted September 11, 2021 Author Share Posted September 11, 2021 Thank you for your quick answer. Acording to Sonnax they are not interchangeable. Actually Sonnax applies a different stategy when remanufacturing RF3 and RF7 which makes them not intechangeable. Pieloux Link to comment Share on other sites More sharing options...
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