Alex Gabel Posted August 27, 2014 Report Share Posted August 27, 2014 Hi, is there a problem with the Link G4 + Nissan Skiline GTS / GTR, Link works with the ignition off, even connects to the laptop. If I run the engine, and then turn off the ignition and take out the key, the engine and Link continue to work, even though all other devices are turned off. Engine stalls only when I click on the gas. On a standard ECU everything is working fine. Where there may be a problem. GTR32 RB26 engine, MT, the jumper is removed, the trigger method to "other models" Please help Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted August 27, 2014 Report Share Posted August 27, 2014 Hi, so you have set the dip switches to suit R32 /33 GTSt , not GTR. If you have set the dipswitches correctly then your  ECU is being back fed through a power source, such as a dodgey relay connection or other device , turbo timer or similar. Unfortunately you will have to back trace the wiring loom and see where the power is coming from. Regards Dave. Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 1, 2014 Author Report Share Posted September 1, 2014 Thank you very much for your reply Unfortunately switched on dip switches to suit R34GTR solves nothing, light on the Link as lights when the ignition is off, and the engine does not start at all. Power supply at pin connectors are on â„–58 (battery) and â„–16 (ECCS relay), with the stock ECU everything is working properly. I have not devices like turbo-timer or similar What else could be the problem? Quote Link to comment Share on other sites More sharing options...
Steve1436215419 Posted September 1, 2014 Report Share Posted September 1, 2014 Here it is better expalined what Dave talks about. http://www.linkecu.com/support/documentation/technical-notes/preventing-auxiliary-channel-backfeeding.pdf Make sure no relay that is connected to the ecu has a constant 12v supply. Quote Link to comment Share on other sites More sharing options...
Steve1436215419 Posted September 1, 2014 Report Share Posted September 1, 2014 Or solenoid for that matter... Quote Link to comment Share on other sites More sharing options...
Simon Posted September 2, 2014 Report Share Posted September 2, 2014 ECU wise the critical pins are Pin 45 should be 12V at key on, 0 volt at key off Pin 16 should be at 0V key on, 12V at key off Quote Link to comment Share on other sites More sharing options...
Simon Posted September 2, 2014 Report Share Posted September 2, 2014 Next step check the voltages at pin 49 and 59. This should have 0 volts at key off and 12V at key on. These two pins are what power the ECU up. If you see around 7-9 volts at key off you have a back feed though an and Aux out put. To find what it is you might need to unplug each device one by one. Eventually the ECU will shut down. Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 3, 2014 Author Report Share Posted September 3, 2014 When the ignition is switched OFF 12V goes only on 16-pin and 58-pin. When switched ON 12V - on the 58th, 49th, 59th and 45th, and 16th - 0V with the stock ECU. With Link 12B - 58th, 49th(?), 59th(?), and 16th when switch OFF. It can be diode? Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 3, 2014 Author Report Share Posted September 3, 2014 again checked with a Link and noticed 0.5V at the 45th at key OFF Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 3, 2014 Author Report Share Posted September 3, 2014 You said unplug each device one by one. What is devices? Quote Link to comment Share on other sites More sharing options...
Simon Posted September 4, 2014 Report Share Posted September 4, 2014 If you look at the ECU configuration for the Aux outputs. For example Aux 8 is likely to be the boost control solenoid. So to check if the back feed is from Aux 8 you would unplug the boost control solenoid and see if the ECU shuts down. Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 4, 2014 Author Report Share Posted September 4, 2014 Thanks Simon, I have tried to disconnect all devices including the connector inside the car, but Link does not turn off. Quote Link to comment Share on other sites More sharing options...
Simon Posted September 5, 2014 Report Share Posted September 5, 2014 Are there any aftermarket devices fitted turbo timer, alarm, boost controller anything that wasn't there factory? Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 5, 2014 Author Report Share Posted September 5, 2014 No any aftermarket devices is not, I unplug the alarm Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted September 5, 2014 Report Share Posted September 5, 2014 Hi Alex, can you locate and disconnect the ECCS relay while the engine is still running with the key turned off. Regards Dave. Quote Link to comment Share on other sites More sharing options...
Alex Gabel Posted September 5, 2014 Author Report Share Posted September 5, 2014 Hi David, when i disconnect ECCS relay, engine shuts down. Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted September 7, 2014 Report Share Posted September 7, 2014 Hi Alex, we have 2 options then. One is to find why the ECCS Relay is staying active. The ECU turns the ECCS RELAY on by applying a ground to the ECCS RELAY coil, the other side of the coil is supplied 12 volts positive through the ignition circuit. Are you able to wire up another ignition relay to control the ECCS relay. I have set up an alternative power source schematic for you to try, it is the one obviously with the second bosch relay added. Regards Dave. Quote Link to comment Share on other sites More sharing options...
[email protected] Posted March 16, 2020 Report Share Posted March 16, 2020 Hi I have a same problem in my r32 gtst rb25. The rb25 ecu working fine but the link continue work when i turn off the key ... Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 16, 2020 Report Share Posted March 16, 2020 8 hours ago, [email protected] said: Hi I have a same problem in my r32 gtst rb25. The rb25 ecu working fine but the link continue work when i turn off the key ... This suggests you have a "backfeed". Usually this is caused by something that is wired to an aux output that is connected to a power supply that is live all the time. Anything that is connected to an aux output must be powered from an ignition switched source. I would first check anything which may have been added to the wiring such as a boost solenoid. [email protected] 1 Quote Link to comment Share on other sites More sharing options...
[email protected] Posted March 16, 2020 Report Share Posted March 16, 2020 8 hours ago, Adamw said: This suggests you have a "backfeed". Usually this is caused by something that is wired to an aux output that is connected to a power supply that is live all the time. Anything that is connected to an aux output must be powered from an ignition switched source. I would first check anything which may have been added to the wiring such as a boost solenoid. yes it may be possible because I have a weak power supply. But I don't understand why the factory ecu works well and link g4 does not work properly, the fuel pump control module stops working, I have the tps wire with current and link g4 is constantly on even with the key off. none of this happens with the factory ecu. Quote Link to comment Share on other sites More sharing options...
Simon Posted March 17, 2020 Report Share Posted March 17, 2020 The factory ECU is using totally different hardware to the link. It also doesn't have the ability to use outputs for different functions. Due to the flexibility of the outputs on the Link we have to have flywheel protection on all Aux drives and this gives the path for back feeds. Quote Link to comment Share on other sites More sharing options...
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