EFMotor Posted May 20, 2013 Report Share Posted May 20, 2013 I have a Skyline gts with a plugin (v44 board), that are having issues with controlling the eccs relay. The ecu is supposed to feed the eccs relay with a ground signal through pin 16, when the ecu receive a +12v signal from the ignition switch through pin 45. The ecu does not seem to be responding to the 12v signal at all. But the ecu will power up on the power received on pin 45. But the voltage here is very low. The engine have been working like this for some time, and we first found these issues on the dyno, when we noticed that the ecu voltage was very low. Anyone else seen something like this? Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted May 20, 2013 Report Share Posted May 20, 2013 Hi, I had a weird issue with a GTSt that I fitted a V44 PNP to awhile ago. However my issue was the ECCS relay staying on when the ignition was turned off, leaving the ECU live. The vehicle was fitted with a security system and turbo timer and the installation was a mess. turned out to be the way they had installed the security system and turbo timer was back feeding the ECCS relay. The wiring was a mess, I fitted another relay to bypass the problem. The customer wanted a cheaper solution, rather than rewire the security and turbo timer. Are there any accessories fitted to the car. Regards Dave. Quote Link to comment Share on other sites More sharing options...
Simon Posted May 20, 2013 Report Share Posted May 20, 2013 The ECU switches the ground using a very simple circuit. If you manually provide a ground to the ECCS relay through pin 16 the ECU should then see full voltage. If this works there is a fault on the ECU or a connection issue at the header. The voltage you are seeing currently is through a back feed. Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 8, 2014 Report Share Posted February 8, 2014 is this issue going to get put in the gts/gtr known issues section of the install manual? would be helpful if it was updated there rather than having to check the forums every few months for a permanent fix. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 9, 2014 Report Share Posted February 9, 2014 Not at this stage as we don't yet know the cause. And weather it is applicable to a stock standard model. Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 11, 2014 Report Share Posted February 11, 2014 have you considered comparing how another ECU reacts in the same situation? ive seen other posts with the same problem as mine, all (including myself) going back to known working ECU without encountering the problem until the vi-pec gets plugged back in. i regret purchasing my vi-pec. i haven't enjoyed my car at all since purchasing it. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 12, 2014 Report Share Posted February 12, 2014 Sometimes there could be an ECU issue (failed component) other times it can be due to changes made to the car. Our known issues tend to be for when there is a consistent issue that will happen every time under known conditions. Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 17, 2014 Report Share Posted February 17, 2014 and im left with my junk in my hand and out of wallet almost 2k with a useless car. thanks vi-pec. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 17, 2014 Report Share Posted February 17, 2014 What is your actual issue? I'm sure with a bit of work a solution can be found. It is entirely possible there is an issue on the car that might not effect factory system but can effect ours. Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted February 17, 2014 Report Share Posted February 17, 2014 Hi SECURITY, Myself and others have fitted many Skyline V44 based PNP units without any issues. The only issue I have ever struck was mentioned above, where someone had altered the factory wiring. One other thing to check, is the wiring loom on the passengers side of the engine bay, near the turbo. This loom has a tendency to get damaged from the heat off the turbo, it is a common issue and the insulation on the wiring sometimes melts and wires short together. Have you tested the permanent power supply to the ECCS relay pin 5 when the engine is not running and then check with it running, then check what is coming out of the ECCS relay pin 3 which supplies power to ECU pin 49, to eliminate a faulty relay (I have had relays with burnt contacts on the COMMON and or N/C or N/O contacts which leads to voltage drop). What does the voltage read at ECU pin 49 with the ignition on engine not running and then with the engine running. If there was an issue with earth switching of the ECCS relay by the ECU then the main Ignition relay would also have a problem. Also just make sure that your dipswitches on the main board of the ECU are pushed firmly into there correct position (I doubt this would be an issue but worth checking). Also make sure that the ECU loom connector block is sitting squarely into the ECU when fitted. It is quite common for the ends to stand up a bit as the bolt is tightened, this leads to poor connectivity to the outer pins on both sides. Just a couple of things to check to help resolve your issues. Regards Dave. Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 19, 2014 Report Share Posted February 19, 2014 thanks for asking the right questions Dave, i have a better understand of which angle i should have tackled the problem from. the wiring loom of an auto i had to modify the wiring to suit the ECU to make it idle which one of your suppliers in sydney fixed. but there possibly could be an issue that im unaware of. the problem started 7 or 8 months after getting it running, when sent back to vi-pec i was told it was the MOSFET chip that popped because of something feeding back into the ECU. after the 2nd time it was returned they also said they would install an external wiring solution if it happens again but instead upgraded the main board the 3rd time and did nothing externally to protect it. software and firmware always up to date and had a dedicated long-battery life laptop for quick adjustment or experimenting with e85 (there were no fuel sensors available back when vi-pec launched). i went through the process to clear defects through the IM230 emissions test with a built rb2530, gcg hiflow, 740cc inj, greddy plenum and all other standard emissions gear and passed with 2 (shagged) stock cats, then started testing in full track trim - but the motor was replaced with a spare rb25det after i couldnt reduce n0x enough without having either HC or CO go up using a catco 3.5" cat, i scraped by with the rb25 no problems. im still using the standard heat shield on the gcg hiflow and there are no signs of heat damage to other wiring that is much closer than the loom. the loom itself is in good shape (sell-able) but from an auto. skyline1 has been parked for around 1.5yrs and has only run if jump-started and taken for a quick burn down the road and a track day where it had to be jump started every time it was turned off. ive started stripping the it because i could no longer afford to renew the registration on problem cars in the mid of the construction bust during the GFC. it is now the donor for skyline2 and mates needing parts. skyline1 = 1993 r33 GTS-t owned for 10 years, all work on this car done in my driveway, auto converted to quick shift then to manual, looks like a drift pig's whore. skyline2 = 1995 r33 GTS-t owned for 6 months, manual. the situation now is skyline2 is inheriting the intake and turbo and then updating the engineer certificate with emissions but i have been dreading the thought of going through the same fate if i swap over the vi-pec. its cleaner and i will burn it before confusion convinces me not to re-register it. soz if this sounds like a sob story, the reality is my car gives me an opportunity to slow my mind. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 19, 2014 Report Share Posted February 19, 2014 The circuit that died originally is a very simple one. It takes a 12 V input from the ignition switch it goes through a voltage divider and then turns on the transistor which provides a ground to the main relay. If this transistor fails it will most likely fail in the on (providing a ground) position this in turn keeps the ECU and a bunch of other components powered up resulting in a constant battery drain. My suggestion is there is a issue around the wiring for the main relay or maybe the hot feed to the ECU. I would be interested to know what was changed to make the car idle if this required a loom change / modification I would be starting in that area. Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 20, 2014 Report Share Posted February 20, 2014 it was the TPS idle switch. if you read my last post the car it was originally installed in is now a donor. will the same ECU work in my new car? Quote Link to comment Share on other sites More sharing options...
SECURITY Posted February 20, 2014 Report Share Posted February 20, 2014 just found my first post for anyone interested: viewtopic.php?f=3&t=842 Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted February 20, 2014 Report Share Posted February 20, 2014 Hi SECURITY, yes your ECU will work in your new car. Will be interesting to see if any issues arise when fitted to the new car. Regards Dave. Quote Link to comment Share on other sites More sharing options...
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