I have 12v at the relay.......goes away and puts brain in.......I might actually wake up this week!!
Right ecu is not switching, pin 27 is the switch wire.
Take the relay out and it loses its 12v to pin 27.
So wiring is not at fault ecu is not switching the relay to earth.
Now when I switch the relay to earth it will fire straight up sometimes and not others. Squirt a little fuel down throttle and it fires and stays running until switched off or earth removed from the ec relay. Is this 2 faults possibly?
Left it running for twenty minutes and came up with a camshaft sensor circuit fault.
Should the ecu switch the engine control relay on when ignition is switched on or when it is cranking? I assume its just on ignition.
If its when its cranking then does it need to see a good ckp and cmp sensor signal before it will fire? Have seen it on the almeras when the chain has stretched or tensioner faulty the ckp and cmp signals go out of sync and car struggles or fails to start but never seen it on a micra before. Usually shows a faulty signal code not a circuit fault though. Or my other theory is that its not seeing the voltage back to earth from ec relay via ecu so thinks the circuit is faulty so the code is being generated by me bypassing the ecu??
Ckp and cmp have already been replaced by previous garage and giving good signals.
Or is it likely to be an ecu fault? Or earthing fault possiby?
Time to poke prod and probe methinks!