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Alex Gabel

Link G4+ skyline GTS/STR problem

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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 

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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.

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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?

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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.

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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?

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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.

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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.

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