bocia79 Posted January 12, 2019 Report Share Posted January 12, 2019 Hello. I'm a newbie of this forum, of link ecu and also in gdi mapping and wiring. My name's Giorgio and I'm from Italy. I'm going to install force gdi in a suzuki boosterjet 1.0 3 cyl. In wiring of ecu at the moment I have only one problem. In oem ecu spill valve is energized directly by ecu at +5v. Spill valve have resistence 0, 7 Ohm, so I can't energize spill valve by +5 of ecu (that is only for sensors vref and I think has no many current to drive spill valve ). In attachment some scope of oem spill valve's control signal. What do you think about? I can make some +5v adapter by tension limiter (like 7805). Is a good choice? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
Richard Hill Posted January 13, 2019 Report Share Posted January 13, 2019 The GDI ecu has a dedicated output pin to drive a spill valve. You must use this, and set your peak and hold currents accordingly. Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 13, 2019 Report Share Posted January 13, 2019 I can’t quite understand what your scope capture is showing. What is channel A & B connected to? Generally the ECU only switches the ground side of the spill valve, the live side comes from the power wiring. On your scope it looks like channel A is set to 10v/div so those small square waves are approx 15v. Quote Link to comment Share on other sites More sharing options...
bocia79 Posted January 13, 2019 Author Report Share Posted January 13, 2019 Thanks for your reply. I attach one page of workshop manual. Where I found thath is energized by +5v. I connect only "A" probe to ground side of spill valve and ground of the probe in engine ground. Is better to use 2 probes and A-B function? Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted January 13, 2019 Report Share Posted January 13, 2019 Do not worry for some reason they have chosen to show the drive circuit, your valve is a derivative of the Bosch HDP Series and the MSV valve is a current not voltage based device, you will need to wire it in accordance with the GDI manual and this is one we can control quite well. bocia79 1 Quote Link to comment Share on other sites More sharing options...
bocia79 Posted January 13, 2019 Author Report Share Posted January 13, 2019 Thanks so much for your clarification about wiring. I apologize to the whole forum for the many questions on this topic, but I would like to avoid damages for my stupid mistakel Quote Link to comment Share on other sites More sharing options...
bocia79 Posted February 6, 2019 Author Report Share Posted February 6, 2019 On 1/13/2019 at 12:41 PM, ClintBHP said: Do not worry for some reason they have chosen to show the drive circuit, your valve is a derivative of the Bosch HDP Series and the MSV valve is a current not voltage based device, you will need to wire it in accordance with the GDI manual and this is one we can control quite well. I've started engine and confirm that g4+ gdi controller connected like manual explain works well, also if oem controller signal is too different. Many thanks to all forum's member. Quote Link to comment Share on other sites More sharing options...
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