HTSmak Posted March 5, 2020 Share Posted March 5, 2020 Been having troubles with my supra for a few years now, it could happen within days, weeks or months, the car will be idling or during the drive just turn off completely. I cant turn it back on unless i unplug the fuel pump ECU in the boot and plug it back in ( may take 2 or 3 times ) before the car starts again, I've even bought another ECU and the problem still happens. About 5 or so years ago I did have the fuel pump changed to a Walbro E85 compatable pump ( all thats written on the paper from the mechanic ). Wondering if theres a way to directly wire the fuel pump ECU into my wolf v550 ECU or what else can I do ? Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 5, 2020 Share Posted March 5, 2020 Bin the lot and get a more up to date ecu , control everything LINK/Haltech/EMU Black are reasonable ; have a chat with your tuner what meets your needs Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 Bin the lot and get a more up to date ecu , control everything LINK/Haltech/EMU Black are reasonable ; have a chat with your tuner what meets your needsI dont have a tuner where i live, it was sent 1000 kilometers away to get tuned and he put the wolf v550 ecu in. What about the fuel pump ecu in the boot, can i hard wire that and remove that ecu or ? Is it maybe the walbro fuel pump aswell ? Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 5, 2020 Share Posted March 5, 2020 Fuel pump is very simplistic , controlled by a relay(s) ; basically an on/off switch. The main ECU i.e. the wolf controls when the fuel pump(s) based on fuel demand Looking at the V550 spec's , it is capable of controlling the pump(s) No idea what this other fuel pump ECU in the boot is? or why it is needed Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 Fuel pump is very simplistic , controlled by a relay(s) ; basically an on/off switch. The main ECU i.e. the wolf controls when the fuel pump(s) based on fuel demand Looking at the V550 spec's , it is capable of controlling the pump(s) No idea what this other fuel pump ECU in the boot is? or why it is neededWell its a stock ecu, theres about 15+ small ecu's throughout the car that all go to the main ecu Quote Link to comment Share on other sites More sharing options...
Mo Reviews Posted March 5, 2020 Share Posted March 5, 2020 Are you sure you're not just referring to relays as ECUs? Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 5, 2020 Share Posted March 5, 2020 (edited) Well its a stock ecu, theres about 15+ small ecu's throughout the car that all go to the main ecu /QUOTE] You need to get pics , if they are relays , no idea why you need 15! It sounds like something is tripping but not enough to cause a fuse to blow Wolf is a standalone ecu with a pnp harness for the Supra , unless you are using the OE ECU to control the stock Auto trans (Wolf states it can control) , no reason you would keep your stick ecu , unless you are referring to the Traction control ecu, resides beside the main stock ecu Edited March 5, 2020 by Jellybean (see edit history) Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 You need to get pics , if they are relays , no idea why you need 15! It sounds like something is tripping but not enough to cause a fuse to blow Wolf is a standalone ecu with a pnp harness for the Supra , unless you are using the OE ECU to control the stock Auto trans (Wolf states it can control) , no reason you would keep your stick ecu , unless you are referring to the Traction control ecu, resides beside the main stock ecuNo they arnt relays they're actual ecu's, the manual states so, the stock main ecu is no longer in the car. Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 Are you sure you're not just referring to relays as ECUs?The manual says they're ecu's not relays Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 No they arnt relays they're actual ecu's, the manual states so, the stock main ecu is no longer in the car. /QUOTE]This is the ecu for the fuel pump, i found an article of someome bypassing the ecu which ill post Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 This is the ecu for the fuel pump, i found an article of someome bypassing the ecu which ill posthttps://uploads.tapatalk-cdn.com/20200305/e275ee6efec028aef72ab4023ad1fab9.jpg /QUOTE]. Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 .https://uploads.tapatalk-cdn.com/20200305/ecf04797c2d66d270be6cd5dc2288263.jpg /QUOTE]. Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 .https://uploads.tapatalk-cdn.com/20200305/11a23052598c2d87f59c14866db57194.jpg /QUOTE]. Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 .https://uploads.tapatalk-cdn.com/20200305/2394b82adae4e169f2498de467c4c68a.jpg /QUOTE]. Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 .https://uploads.tapatalk-cdn.com/20200305/3f2c6c046795dcb2b1896294b8adf7f2.jpg /QUOTE]Bit blurry to read those but yeah, theres an ecu for the fuel pump but im not sure if this will fix the issue nor if i should try this ? Sent from my SM-G950F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted March 5, 2020 Share Posted March 5, 2020 (edited) Have you fitted a 4 pin 30A relay? Take a look here - http://www.mkivsupra.net/vbb/attachment.php?attachmentid=154220&d=1341391583 Edited March 5, 2020 by Frank Bullitt Link added. (see edit history) Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 5, 2020 Author Share Posted March 5, 2020 Have you fitted a 4 pin 30A relay? Take a look here - http://www.mkivsupra.net/vbb/attachment.php?attachmentid=154220&d=1341391583Says the page cant be found ? Quote Link to comment Share on other sites More sharing options...
Frank Bullitt Posted March 5, 2020 Share Posted March 5, 2020 (edited) Says the page cant be found ? /QUOTE] It's because you haven't paid your membership, parts of the forum are closed off to non paying members. There is loads of technical stuff on the forum that would help you out. If you go to the top right of your page and click on settings, then on the left of your screen you will see a list. Under My Account click paid subscriptions. It's £10 per year or £30 for life Well worth it for all the knowledge that is held within these walls. In the meantime i'll host the image so you can see it. Edited March 5, 2020 by Frank Bullitt Image added. (see edit history) Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 5, 2020 Share Posted March 5, 2020 (edited) JZA80 does not have a Fuel pump ECU , Looks like you have some form of OE Toyota relay installed (Fuel ECU) Soarer ; I presume you had this installed a long time ago You will need to either have an auto electrician test the units are still working or take the car to a tuner to diagnose At lease pull any logs from the ECU to see if you can identify the issue If it was me , this ECU is from pre 2007 ; I would upgrade to a more modern ECU ; probably more cost effective after you go chasing gremlins plus you may find it difficult to find somebody familiar with the wolf, tech has come on light years since then Edited March 5, 2020 by Jellybean (see edit history) Quote Link to comment Share on other sites More sharing options...
Shane Posted March 5, 2020 Share Posted March 5, 2020 Just as a point of interest really, the early LS400 1uz had a novel but very effective way of regulation. So in normal conditions the pump voltage ran through a series resistance dropping the voltage to about 9v then when the ecu called for more fuel a set of relay contacts co-located with the resistor bypassed the resistor and gave the pump full voltage. What made me think of it was that your photo looked very similar to the resistance they used. Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 7, 2020 Author Share Posted March 7, 2020 JZA80 does not have a Fuel pump ECU , Looks like you have some form of OE Toyota relay installed (Fuel ECU) Soarer ; I presume you had this installed a long time ago You will need to either have an auto electrician test the units are still working or take the car to a tuner to diagnose At lease pull any logs from the ECU to see if you can identify the issue If it was me , this ECU is from pre 2007 ; I would upgrade to a more modern ECU ; probably more cost effective after you go chasing gremlins plus you may find it difficult to find somebody familiar with the wolf, tech has come on light years since thenWell the manual for my car 1995 jza80 twin turbo 6 speed model says its an ecu and theres lots of other smaller ecu's but thanks Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 7, 2020 Author Share Posted March 7, 2020 Just as a point of interest really, the early LS400 1uz had a novel but very effective way of regulation. So in normal conditions the pump voltage ran through a series resistance dropping the voltage to about 9v then when the ecu called for more fuel a set of relay contacts co-located with the resistor bypassed the resistor and gave the pump full voltage. What made me think of it was that your photo looked very similar to the resistance they used.I know the car also has a really bad earth leakage cause the battery drains really quick when its not running, not sure if this could be affecting it Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 7, 2020 Author Share Posted March 7, 2020 JZA80 does not have a Fuel pump ECU , Looks like you have some form of OE Toyota relay installed (Fuel ECU) Soarer ; I presume you had this installed a long time ago You will need to either have an auto electrician test the units are still working or take the car to a tuner to diagnose At lease pull any logs from the ECU to see if you can identify the issue If it was me , this ECU is from pre 2007 ; I would upgrade to a more modern ECU ; probably more cost effective after you go chasing gremlins plus you may find it difficult to find somebody familiar with the wolf, tech has come on light years since thenAlso that fuel pump ecu was in the car when i bought it Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 7, 2020 Share Posted March 7, 2020 Ok so first of all let's clear up some misinformation. Both NA and TT Supra's use a fuel pump ECU from factory, located in the boot of the car. The NA and TT fuel pump ECU's are different, but effectively perform the same job. Although the TT units are stouter as they need to handle more load compared to NA. The TT fuel pump ECU's basically take a 12V feed from EFI#2 Relay, then output either a 9v or 12v feed to the fuel pump ECU depending on if the stock ECU commands a low load or high load situation via the use of a PWM 5v signal. The first thing you need to test if you think your fuel pump ECU is on the way out is the following. Switch your ignition on, but don't turn on the engine. Go into your engine bay, find the diagnostics port and bridge FP & B+ using a piece of wire. Bridging this puts the fuel pump ECU into test mode and will cause it to run at 12v continually. You should hear your fuel pump kick turn on, even if the engine is off. If your fuel pump does not kick on after doing this then you know you either have a wiring fault or the fuel pump ECU is faulty. Not all aftermarket ECU's can play nice with the stock fuel pump ECU. Typically when using a standalone we always replace the fuel pump ECU with as relay, as some other members have described above. I have never used a Wolf ECU before so can't comment on it's compatibility with stock fuel pump ECU. But I would imagine if you needed to setup a fuel pump relay, then you just need to wire either a grounded or 12v output from the Wolf ECU to trigger a relay for the fuel pump. Some aftermarket fuel pumps also don't like being run at 9V, usually requiring a minimum of 12v to be running troublefree. So this could also be a possibility depending on whats been installed in your tank. Start with the diagnostic port and see what it does then report back. Quote Link to comment Share on other sites More sharing options...
HTSmak Posted March 7, 2020 Author Share Posted March 7, 2020 Ok so first of all let's clear up some misinformation. Both NA and TT Supra's use a fuel pump ECU from factory, located in the boot of the car. The NA and TT fuel pump ECU's are different, but effectively perform the same job. Although the TT units are stouter as they need to handle more load compared to NA. The TT fuel pump ECU's basically take a 12V feed from EFI#2 Relay, then output either a 9v or 12v feed to the fuel pump ECU depending on if the stock ECU commands a low load or high load situation via the use of a PWM 5v signal. The first thing you need to test if you think your fuel pump ECU is on the way out is the following. Switch your ignition on, but don't turn on the engine. Go into your engine bay, find the diagnostics port and bridge FP & B+ using a piece of wire. Bridging this puts the fuel pump ECU into test mode and will cause it to run at 12v continually. You should hear your fuel pump kick turn on, even if the engine is off. If your fuel pump does not kick on after doing this then you know you either have a wiring fault or the fuel pump ECU is faulty. Not all aftermarket ECU's can play nice with the stock fuel pump ECU. Typically when using a standalone we always replace the fuel pump ECU with as relay, as some other members have described above. I have never used a Wolf ECU before so can't comment on it's compatibility with stock fuel pump ECU. But I would imagine if you needed to setup a fuel pump relay, then you just need to wire either a grounded or 12v output from the Wolf ECU to trigger a relay for the fuel pump. Some aftermarket fuel pumps also don't like being run at 9V, usually requiring a minimum of 12v to be running troublefree. So this could also be a possibility depending on whats been installed in your tank. Start with the diagnostic port and see what it does then report back.Thanks a lot Quote Link to comment Share on other sites More sharing options...
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