Emerald K6+ ECU restarts on cranking

[Jake Gully]

Wired up my ECU, Dash and engine harness yesterday, all ready for a first start.

However, unable to get the engine to fire despite fuel pumps and everything appearing to work.

The ECU turns on at Switch position one and shows 7.4v, which increases to 12.4v once the ECU relay kicks in at switch position 2.  All the fuel pumps whirr into life.   However, when I crank the engine the ECU indicator light goes from red to off and the ECU appears to reset/disconnect.

The unit is connected to a factory loom and earths directly through this to the chassis.   I'm suspecting the power feeds in to the engine harness are not good enough and it browns out when attempting to crank.   I don't get any info back from the crank or cam sensor, though have also verified these connections to the harness.

Not much info on the Emerald FAQs, but I think this is either a bad supply voltage connection or, possibly an engine protection feature if it does not see anything back from the crank/cam?

Can anyone verify if the switch position 1 voltage in live view should be 12v, rather than the 7.4.     Any advice welcome at this point!

 

[Jake Gully]

OK - think this was due to an error in the map, setting the cam sensor as digital, rather than inductive.   I have also remade the connections for the Ignition and ECU relay feeds as these had cheap dry crimps.  It fires now at idle, but does not keep running - more tweaks for the injectors and fueling I think.   Only wish I knew what I was doing!
 

   

[Jake Gully]

All was not well this morning and I was unable to get the ECU to stay up at all this morning.    In the end I called Emerald and had a very useful chat with Keith, who spent a good 10-15 minutes talking through with me.   

Effectively the unit requires the 12v feed from ignition (12v sense, pin 11 to run), even after the ECU relay feed comes on.   Having gone through he suggested this was likely a fault with my ignition, dropping power to Aux 1 when cranking.

Have wired this in to a temporary feed to prove and it now starts and runs fine.

Edited March 12 by Jake Gully