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Re: EFI and Electronic Ignition Initial Start Up Questions [message #367966 is a reply to message #367948]

Sun, 12 December 2021 08:42

RF_Burns

Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada

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Senior Member

BillVV

>>All that is required is the distributor reference pulses (DRPs). The crank signal is not required, that just lets the ECM know when to test the fuel pump relay.

Good to know for certain; thanks Bruce! Do you know what the fuel pump relay test is? I suppose it tests for fuel pump relay power on pin B2 while cranking for diagnostics.

In response to your question, from my understanding B2 is reading the fuel pump voltage continuously while the engine is running. It uses this to calculate a correction to the injector pulse width to compensate for varying electrical system voltages as it affects the pump and the injector flows. I'm thinking the Cranking signal to C9 lets the ECM (EBL) know that it is cranking to initiate the Choke functions and adds even more injector pulse width to compensate for the even lower cranking voltages.

The WUD shows the fuel pump voltage as well as Bat voltage.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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[Message index]

		EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Wed, 08 December 2021 18:46
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Wed, 08 December 2021 20:28
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Wed, 08 December 2021 22:43
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 06:48
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: Keith V on Thu, 09 December 2021 10:07
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Thu, 09 December 2021 10:40
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 10:42
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: James Hupy on Thu, 09 December 2021 12:00
		Re: EFI and Electronic Ignition Initial Start Up Questions By: rvanwin on Thu, 09 December 2021 12:30
		Re: EFI and Electronic Ignition Initial Start Up Questions By: rvanwin on Thu, 09 December 2021 12:44
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 13:32
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: Dave Stragand on Thu, 09 December 2021 13:57
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 15:37
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Thu, 09 December 2021 15:56
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: James Hupy on Thu, 09 December 2021 15:59
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 16:57
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: James Hupy on Thu, 09 December 2021 17:08
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 17:48
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Thu, 09 December 2021 18:30
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Thu, 09 December 2021 18:21
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 19:02
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Thu, 09 December 2021 19:29
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Thu, 09 December 2021 19:40
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Thu, 09 December 2021 21:00
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Fri, 10 December 2021 08:20
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: sgltrac on Fri, 10 December 2021 10:06
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Fri, 10 December 2021 10:08
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Fri, 10 December 2021 10:47
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Fri, 10 December 2021 11:45
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Biggamehunter on Fri, 10 December 2021 13:58
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Fri, 10 December 2021 14:16
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Fri, 10 December 2021 17:29
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: sgltrac on Sat, 11 December 2021 01:20
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Biggamehunter on Fri, 10 December 2021 16:35
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Fri, 10 December 2021 18:38
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Sat, 11 December 2021 07:58
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Sat, 11 December 2021 11:00
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Sun, 12 December 2021 08:42
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Sat, 11 December 2021 13:45
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Sat, 11 December 2021 13:52
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: jimk on Sat, 11 December 2021 13:52
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Sat, 11 December 2021 14:17
		Re: EFI and Electronic Ignition Initial Start Up Questions By: kingd on Sat, 11 December 2021 17:27
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Bill Van Vlack on Sat, 11 December 2021 18:43
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: James Hupy on Sat, 11 December 2021 18:35
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Sat, 11 December 2021 19:51
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Sat, 11 December 2021 19:54
		[GMCnet] Re: EFI and Electronic Ignition Initial Start Up Questions By: James Hupy on Sat, 11 December 2021 19:58
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Sat, 11 December 2021 22:13
		Re: EFI and Electronic Ignition Initial Start Up Questions By: RF_Burns on Sun, 12 December 2021 08:31
		Re: EFI and Electronic Ignition Initial Start Up Questions By: Tom Katzenberger on Sun, 12 December 2021 12:27
		Re: EFI and Electronic Ignition Initial Start Up Questions By: jhbridges on Sun, 12 December 2021 17:28

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