Swampy442 Posted March 7, 2020 Share Posted March 7, 2020 Depending on the spec of the ECU, it should have outputs that can be controlled, sure fuel pump is one? If not just hard wire it with a relay, sometimes called "the 12v mod' Quote Link to comment Share on other sites More sharing options...
Shane Posted March 8, 2020 Share Posted March 8, 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. As usual Mike is spot on with this information, let us know how you get on. I have never seen a Mkiv that didn't have a fuel pump ecu. Quote Link to comment Share on other sites More sharing options...
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