Audi 100 fuel pump relay? Where?!? - Page 2

missfire · 20-06-14, 11:53 PM

Looks like that box is missing the 'Motor/Moteur' ECU fuse holders also so it must not have much of a brain.

early/original RT.

ian20v · 20-06-14, 11:55 PM

Thats Roger D for 263

msh · 20-06-14, 11:55 PM

The fusebox wasn't changed and it was used in the same form also in later B2's, B3's and B4's.

213 and 215 are almost identical, 215 is heavy duty version of 213 with higher rated current, I presume that originally it was intended for engines like NM, 7A and 3B, because there the relay has to pass power to injectors as well [+ something else I've forgotten], unlike KE-jetronic/KE-motronic powered engines, where it only turns on the fuel pump.

msh · 20-06-14, 11:57 PM

Quote:

Originally Posted by missfire

Looks like that box is missing the 'Motor/Moteur' ECU fuse holders also so it must not have much of a brain.

early/original RT.

Ignition control unit remains the same regardless if it's K-jet or KE-jet.

missfire · 20-06-14, 11:59 PM

I know the fusebox wasn't changed, I meant the pump relay.

A pic. or a later relay for the OP, from google.

missfire · 21-06-14, 12:02 AM

Quote:

Originally Posted by msh

Ignition control unit remains the same regardless if it's K-jet or KE-jet.

I mean the fuel computer, whatever it's called, there are two big ECUs in post 1991 C3 cars, one under each kick panel in the driver and passenger footwells. One does the ignition, one does the fuel, hence the K 'E'

Mine are KE 111, which have some electrical crap controlled by the Fuel ECU I think, differential fuel pressure regulator, lambda feeds into it too I think. All emissions stuff, just more to go wrong.

ian20v · 21-06-14, 12:02 AM

Did they not fit an antitheft thing in the fuel pump relay on the later type 44s,theres no fuse holder in any of mine.

missfire · 21-06-14, 12:05 AM

Yours are early then, that's what I was meaning by jumping the pump in your other thread, easiest way to do it is to stick a fuse in the top of the relay, on mine.

msh · 21-06-14, 12:25 AM

All that factory alarm could do - don't allow to switch on starter interlock relay, nothing else. And nothing related to fuel pump relay. Fuse holder is for switching engine management into service mode or blinking fault codes. Obviously early C3's had no engine management that smart.

Quote:

Originally Posted by missfire

I mean the fuel computer, whatever it's called, there are two big ECUs in post 1991 C3 cars, one under each kick panel in the driver and passenger footwells. One does the ignition, one does the fuel, hence the K 'E'

Fuel pump relay is turned on by ignition control unit, so we can forget about fuel injection stuff in this thread. Older engines without electronic ignition use fuel pump relay that has enough logic inside to turn on and keep running fuel pump according to rpm signal.

missfire · 21-06-14, 12:48 AM

Hmm! That might explain something then, on the 100 turbo the pump doesn't prime on first ignition. It does nothing until the engine starts. It that being triggered by an rpm signal then? It's an older car than the other two but still has a fekin complicated fuel system under the bonnet.

Correction Ian, you can run the pump via the fuse holder, when doing the solenoid output tests. It doesn't jump the pump! I just remembered running it via that fuse holder. But you don't have one, so it doesn't matter.

20-06-14, 11:55 PM	#12
ian20v 4 ring whore! Classic Audi Club Member Join Date: Jan 2009 Location: Sticksville,dumfries and galloway Posts: 4,241	Thats Roger D for 263 __________________ 1987 audi 200 Quattro saloon sorned,few bits to do yet. 1987 Audi 200 quattro avant sorned,getting rebuilt Daily Toyota Hilux 1999 2.4td double cab VW caddy van 1.9tdi 2010

21-06-14, 12:02 AM	#17
ian20v 4 ring whore! Classic Audi Club Member Join Date: Jan 2009 Location: Sticksville,dumfries and galloway Posts: 4,241	Did they not fit an antitheft thing in the fuel pump relay on the later type 44s,theres no fuse holder in any of mine. __________________ 1987 audi 200 Quattro saloon sorned,few bits to do yet. 1987 Audi 200 quattro avant sorned,getting rebuilt Daily Toyota Hilux 1999 2.4td double cab VW caddy van 1.9tdi 2010

20-06-14, 11:53 PM	#11
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	Looks like that box is missing the 'Motor/Moteur' ECU fuse holders also so it must not have much of a brain. early/original RT.

20-06-14, 11:55 PM	#13
msh 4 ring whore! Join Date: Jun 2008 Location: Rucava, Latvija Posts: 3,816	The fusebox wasn't changed and it was used in the same form also in later B2's, B3's and B4's. 213 and 215 are almost identical, 215 is heavy duty version of 213 with higher rated current, I presume that originally it was intended for engines like NM, 7A and 3B, because there the relay has to pass power to injectors as well [+ something else I've forgotten], unlike KE-jetronic/KE-motronic powered engines, where it only turns on the fuel pump.

20-06-14, 11:59 PM	#15
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	I know the fusebox wasn't changed, I meant the pump relay. A pic. or a later relay for the OP, from google.

21-06-14, 12:05 AM	#18
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	Yours are early then, that's what I was meaning by jumping the pump in your other thread, easiest way to do it is to stick a fuse in the top of the relay, on mine.

21-06-14, 12:48 AM	#20
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	Hmm! That might explain something then, on the 100 turbo the pump doesn't prime on first ignition. It does nothing until the engine starts. It that being triggered by an rpm signal then? It's an older car than the other two but still has a fekin complicated fuel system under the bonnet. Correction Ian, you can run the pump via the fuse holder, when doing the solenoid output tests. It doesn't jump the pump! I just remembered running it via that fuse holder. But you don't have one, so it doesn't matter.