how_supra Posted October 6, 2005 Share Posted October 6, 2005 Not even remotely useful to me to know this in any way whatsoever But I want to know, and I can't find the answer using the search button Does anyone want to share the knowledge with me? How does it work? Why do you need one? etc etc etc Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 6, 2005 Share Posted October 6, 2005 You need one to prevent the ECU from shutting down the fuel supply if the ECU 'sees' too much boost than Toyota intended. It works by monitoring the signal, (voltage), sent by the MAP sensor, (Manifold Absolute Pressure, or pressure sensor for short). As a rough guide, 1 bar of boost equates to roughly 4.5 volts, so the FCD, (Fuel Cut Defender), allows all the correct voltages to get sent to the ECU, but when it gets to about 4.4volts, it then clamps that signal so that the ECU always 'thinks' you're running standard boost pressures. Does that make sense? Quote Link to comment Share on other sites More sharing options...
JustGav Posted October 6, 2005 Share Posted October 6, 2005 Yup, couldn't describe it any better... When it hits the right voltage it just holds it at that, regardless of what it sees... Gav Quote Link to comment Share on other sites More sharing options...
Alex Posted October 6, 2005 Share Posted October 6, 2005 FC is caused by the ECU seeing a certain voltage from the MAP sensor. This voltage is created by boost pressure. Once you hit a high enough boost pressure the voltage being received by the ECU tells the ECU it's overboosting and Fuel Cut is initiated. An FCD stops the voltage hitting the FC limit. So the ECU never gets the voltage needed to initiate Fuel Cut. EDIT - Obviously I took too long writing that! Quote Link to comment Share on other sites More sharing options...
Class One Posted October 6, 2005 Share Posted October 6, 2005 All is revealed here Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 Top stuff guys Thank you. Quote Link to comment Share on other sites More sharing options...
Guru Posted October 6, 2005 Share Posted October 6, 2005 Wow good help comes fast Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 6, 2005 Share Posted October 6, 2005 Now perhaps you can explain to us, why oil is good? Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 Wow good help comes fast It certainly does. Matts explanation is very good. Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 Now perhaps you can explain to us, why oil is good? Do you really need me to explain this to you? Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 6, 2005 Share Posted October 6, 2005 Well, you never know. It might come in handy some day... Sorry, that's not funny at all. How's you car coming on now? - I haven't been on here for ages so I may have missed you getting it fixed. Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 Well, you never know. It might come in handy some day... Sorry, that's not funny at all. How's you car coming on now? - I haven't been on here for ages so I may have missed you getting it fixed. No it is funny, and it was really careless, and to this day I can't think why I didn't check it more regularly. I am now checking the oil every two days!! I finally got the car back on Tuesday, after 5 weeks and 3 weeks of nagging the garage............oh and a hhhhhhhuuuuuuuuugggggggeeee bill. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 6, 2005 Share Posted October 6, 2005 LOL, well at least you've learned something from it. Glad it's all sorted now though. Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 LOL, well at least you've learned something from it. Glad it's all sorted now though. Thanks Matt. And yes lesson well and truthly learnt. :thumbdown Quote Link to comment Share on other sites More sharing options...
Ian R Posted October 6, 2005 Share Posted October 6, 2005 Well, you never know. It might come in handy some day... When you drive a 2000cc VW for instance Quote Link to comment Share on other sites More sharing options...
how_supra Posted October 6, 2005 Author Share Posted October 6, 2005 When you drive a 2000cc VW for instance Care to elaborate? Quote Link to comment Share on other sites More sharing options...
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