Help, Advice, Owners" Discussion and DIY Tutorials on all Volvo"s "mid era" rear wheel journey Volvos.

You are watching: Volvo 740 fuel pump relay location

1975 - 1993 2401983 - 1992 740 1982 - 1991 7601986 - 1991 7801990 - 1998 940 1990 - 1998 9601997 - 1998 V90/S90
Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 pm Year and also Model: 1989 740glLocation: Wisconsin
Yes...Ive searched....a LOT. Ive had some random intermittent drivability troubles with mine "89 740gl. Lose of power, backfiring, almost stalling if ns didn"t feather the throttle. Then unexpectedly it would certainly clear up.Of course, after ~ finding it to be a typical problem, I checked the relay. Crucial on..click. Start...another click. Seemed fine.I uncovered the "jumper test" and tried that, and could hear the pump running, BUT... The car wouldn"t start. Pen 30 and 87/2, or the closest reduced on the left, jumped to middle pin top top the right. (Ive seen photos that space NOT correct)Not sure why the didn"t work? placed the original relay earlier in. In trying to more diagnose, I put my finger on the relay while it was to run "well". That seemed almost HOT and all of a suddenly I could feel it click or buzzing as the vehicle started to operation worse. Ah HA! That"s IT!.....right?I gotten rid of the relay and took turn off its cover. The solder joints looked awful. I also found that civilization have had success reflowing the solder, so i tried the last night. In the meantime i ordered a new Stribel brand relay. I recognize they were the OE manufacturer, and also -must- be good. The one I have is actally dated... 1989.Sorry, I"m babbling, I"ll get to the point.
*
ns am not 100% that my reflow was successful and also don"t desire to fry anything...else. I may toast the computer?My question....(finally lol)What pins top top the relay must or have to not have actually continuity or resistance as soon as not installed? i think i may have overflowed the solder, and also want to do -positive- before I even plug it earlier in. Any (constructive) advice would certainly be appreciated. Mine friends said I must crush and scrap it. Uh...no.Wow, long post, i m really sorry
*
Thanks!
Last edited by Jeff Schubert top top Tue Dec 13, 2016 6:49 pm, edited 2 time in total.
1989 Volvo 740gl1956 Ford F-100 big Window2006 Honda zero Saber 1100
Top
Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 afternoon Year and also Model: 1989 740glLocation: Wisconsin
*

If friend think the looks bad now you should have seen the BEFORE.Oxy Torch, plasma cutting, and stick and/or MIG welding..yes. However, ns am no confident in my soldering ability. Watch why? BlahMy electronics testing is relatively minimal as well, yet I"m sure I could be walked with a bench test of this relay.I discovered a diode (I think) that only permits continuity in one direction.I am still confused on why the relay bypass jumper check did no work, even though i heard the pump.While ns AM acquiring a new relay, ns am curious IF I had the ability to repair this one...but apprehensive to even plug that in to shot to view if it works. Mine luck lately it would an outcome in a thermonuclear reaction and also complete meltdown. Poof.Its exceptionally difficult, likely impossible, to placed the smoke ago into electronic devices once its let out. That much I do know.
*
I would certainly think 3 tests might be done, at least for continuity. In ~ idle, with one relay closed, and also both relays closed. Do sense? I could see that there would certainly be resistance in the windings, but not complete continuity, true?So much what i have tested... At "idle" i am acquiring continuity between 30 and also 86-1. I likewise get it in between 85 and also 86-2 uneven I reverse experimentation polarity. (Diode?) I have actually not however checked v the relay contact(s) closed.What have the right to I fried food if i shorted anything? turn off the optimal of mine head, I"m reasoning ecm, amm, O2 sensor? every considerably much more expensive 보다 a new relay...Thanks again
lummert Posts: 1371 Joined: Tue january 29, 2008 5:39 afternoon Year and also Model: 760 1988Location: Portland Indiana, USA Beenthanked: 24 times
The relay bypass test calls for running a jumper native 30 come 87/1 and 87/2 if you desire to start the car. You need pumps and injectors for the engine to run.
Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 pm Year and Model: 1989 740glLocation: Wisconsin
Yes, give thanks to you an extremely much, Lummert, that renders much an ext sense. I had actually only checked out the one wire jumped and also people claimed it worked until they gained a new relay.This will certainly NOT work-related to start your Volvo..
*

*

I will try the "correct" jumper and report my findings, and post pictures. There are countless dead ends here that room not known to be resolved.
lummert Posts: 1371 Joined: Tue jan 29, 2008 5:39 pm Year and Model: 760 1988Location: Portland Indiana, USA Beenthanked: 24 times
Jeff Schubert wrote:Yes, thank you really much, Lummert, that renders much much more sense. I had actually only watched the one cable jumped and people claimed it functioned until they obtained a new relay.This will certainly NOT job-related to begin your Volvo..
Nor will this...
I will try the "correct" jumper and report mine findings, and post pictures. Over there are many dead ends below that room not well-known to it is in resolved.
87/2 powers up the pumps. However the radio suppression relay demands to be motivated through 87/1 to power the injectors.
Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 afternoon Year and also Model: 1989 740glLocation: Wisconsin
Excellent, many thanks again. I just made myself a Y shame jumper. Together you explained, have to jump 87-1 and 87-2 come 30. Presumably 87-2 goes come fuel pump, 87-1 goes come radio suppression relay, and pin 30 is power.So, viewed from the height of the relay panel would certainly be 30 is lowest left, 87-1 is highest possible left, and also 87-2 is middle right pin...correct?For safety sake i think it would certainly be best to plugin 87-1 and 87-2 FIRST, then plugin 30. Less chance the accidently shorting. Appears logical.

See more: What Is The Measure Of Angle B, Error 403 (Forbidden)


Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 pm Year and also Model: 1989 740glLocation: Wisconsin
Well, yes, the jumper DID work to start the car. However, the still does not run right. I did because that a few minutes then earlier to stumbling, backfiring,and proper idle.Is over there a bypass test because that the radio suppression relay? i don"t know what can be leading to such an intermittent problem.I will check the codes again. The relays will certainly not cause the CEL come come on, correct? The first codes I got the other day were 221 and/or 231. If it was trying come idle, a 133 code come up. The 221 is a too lean or also rich, i m sorry I had figured might be was a result of my now replaced fuel press regulator. I thought the 133 TPS code was indigenous the lurching idle. I ran the tests indigenous OBD and everything sounded choose it was working. Ns am no in a place to store throwing random parts at this car.I have a negative feeling the is the fuel pump, however have however to do a contraption to inspect the fuel pressure. Any suggestions are significantly appreciated. Its 4 degrees in Wisconsin and I am stranded at home.
Jeff Schubert Posts: 24 Joined: Mon Dec 12, 2016 9:01 afternoon Year and Model: 1989 740glLocation: Wisconsin