Subject	Fuel Control Unit
Posted by	Cjw3 on December 04, 2013 at 8:26 AM
	This message has been viewed 307 times.
In Reply To	Re: Yes it works.. posted by slcZ32 on December 03, 2013 at 10:05 PM
Message	The Fuel Pump Relay turns on the Hot side of the 12 Volts.. But the FCU controls the Speed of the Fuel Pump by Limiting the 'Ground Side' of the Fuel Pump to limit flow at reduced engine loads.. If the Orange wire is hot, the Fuel Pump will only run if the FCU is allowing the Pump to run at a speed.. The FCU is not designed to prevent the pump from running, but you have something very weird going on here, and I'm trying to wrap my head around if it's a Fuel Pump Relay not turning on, or some sort of faulty FCU wiring or control.. NORMALLY if the Orange wire is Hot, the FCU will let the Pump run at SOME Speed.. I'm trying to figure out if that is the case here.. Cj
Follow Ups	cold start problems - slcZ32 20:29:39 12/02/13 Try another ECU..... - zx299 00:06:03 12/03/13 Do some voltage checks please.. - Cjw3 09:48:50 12/03/13 Fuel pump is working..... - zx299 16:15:22 12/03/13 Gives me something to look at - -Grimm- 17:06:46 12/03/13 Re: Gives me something to look at - slcZ32 19:14:07 12/03/13 No your situation is not normal - Cjw3 19:19:02 12/03/13 Excactly, not saying its normal - -Grimm- 09:02:56 12/04/13 Yours is easy to check...... - zx299 18:02:49 12/04/13 Re: Fuel pump is working..... - slcZ32 19:08:14 12/03/13 Yes it works.. - Cjw3 19:15:30 12/03/13 Re: Yes it works.. - slcZ32 22:05:17 12/03/13 Fuel Control Unit - Cjw3 08:26:01 12/04/13 Re: Fuel Control Unit - slcZ32 06:05:18 12/07/13
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