Originally Posted by
AstoN_B
Cheers mate. I take it the live for injectors comes from ecu to make it ignition controlled instead of permanent?
First project and I'm jumping in to the deep end
The tidiest way is to have a relay to switch the 12V supply to the engine system (ie ECU on pin28, injectors, coils, valves etc.) and controlled by the ECU Pin4 (Main Relay control pin).
Take an ignition switched 12V signal to ECU Pin11 - when this is active the ECU will then switch the main relay on and supply 12V power to the whole system.
Read the Emerald maunual -
http://www.jkm.org.uk/performance/Mi...aft%20v051.pdf - that will answer a lot of questions.