No voltage to fuel pump

[bkfj40]

I drove my 80 home friday night...saturday morning went to start it and it didn't start. Went through some basic diagnostics...had spark - no fuel. Tore into the service manual...with only a slight glitch...I have the FSM for a 1993 and mine is a 1995...hopefully I am still on the right path.

Pulled the second row of seats and got to the fuel pump. Put 12v on it and it works. Put it back into the truck and try cranking, it cranks, but doesn't start. Start digging through the manual a little more. Checked the EFI main relay...seemed to be the problem when you look at the diagram found on page EG-296. It appears that they might have rotated the relay because the terminals on the relay are off 180 degrees as shown in the manual. If I am right, then the EFI relay is not the problem...

What does seem to be the problem is either the fuel pump relay, fuel pump switch or the circuit opening relay...

I attacked the circuit opening relay Went through the relay inspection as outlined in the manual. (pg EG-298 for those following along in their 1993 FSM) It appeared that it was bad, so I got a new one at the dealer - PART NUMBER 90987-04002

Put it in, cranked it, no start - went back and checked the relay and it appears that it is bad as well - atleast according to the FSM. Anyone care to check one that they have? It is located at the bottom of the drivers side kick panel...not too bad to dig into.

Checking for continuity, I don't get the required continuity between STA and E1...does your relay get continuity here? I would get another from the dealer, but they won't have any till tomorrow.

I could use some guidance here...any help would be appreciated...I am not sure if I got a bad relay or if I need to keep looking for my problem and the FSM is incorrect with regards to checking the manual. If I hook 12v up to the fuel pump, the truck will start and run.

some additional information (not necessarily pertinant, but who knows) I installed the CDL switch last week. In the process, I took out the little Toyota security panel switch-siren, whatever that piece is...and didn't put it back in, I just unplugged it...I drove the truck for several days like this, so I don't think this is the problem, but who knows.

Happy Trails
brian
540.478.4747 cell

 

[bkfj40]

Bad Relay?

a little bump to the top....I think Junk might've sent all his problems down my way... :whoops:

bk

 

[LandCruiserPhil]

Bad Relay?

Brian Do you have a diagram you can post on the terminals you want tested. I don’t have the FSM showing them. Does the FSM show which terminals are for your coil on the relay ....If so feed them with 12v and see if anything happens. Also does the FSM show which is switched the neg. or pos to energized the coil so you could tell if there is power to the coil.


Keeping you on top
Phil

 

[RavenTai]

Re:Bad Relay?

I don't have any answers for you but the 96 is probably closer to the 95 than the 93 is, circuit opening relay and the fuel pump relay are on the last page of schematics, there is also some info about them in the text

http://webpages.charter.net/raventai/060 ENGINE CONTROL.pdf

 

[ppc]

Re:Bad Relay?

Have you checked the 15A EFI fuse in the engine compartment?

 

[bkfj40]

Bad Relay?

yep...EFI fuse is good...

I also wonder about the fuel pump resistor as referenced in the pdf link above. The problem is finding it...anyone have any ideas?

Happy Trails,
Brian

 

[RavenTai]

Bad Relay?

[quote author=bkfj40 link=board=2;threadid=17321;start=msg167700#msg167700 date=1086172863]I also wonder about the fuel pump resistor as referenced in the pdf link above. The problem is finding it...anyone have any ideas?

Happy Trails,
Brian
[/quote]

on the 96 there are 3 connectors behind the cruise control module on the USPS of the engien bay, the resistor is the most foreward one

 

[bkfj40]

Bad Relay?

I'll check the resistor tonight...there really isn't a whole lot to this problem, but there is a reason for me being a structural engineer over an electrical engineer hopefully the relay will be at the dealer this afternoon for a test of the new one...

bk

 

[ppc]

Re:Bad Relay?

You can pull the relay and jumper across the conector. I run normally like this bypassing the resistor.

 

[bkfj40]

Bad Relay?

UPDATE:

still no running cruiser

I checked out the MAF and it appears to be good. At first I thought it was wrong, but they diagnostics changed between 1993 and 1995...I guess I need to get another FSM.

Here's the run down-
no voltage to fuel pump when trying to start it. If I jump the fuel pump with 12v, the vehicle starts but is running rich. I need to determine what sensor along the route is stopping the voltage from hitting the fuel pump...a case of beer is waiting for those who pick the right one

brian

 

[Junk]

Yo BK, got my manual back today. If you want, I'll overnight it to you, just need the address.

 

[Photoman]

Brian,

First, I would check under the hood at the EFI fuse and make sure one side of the fuse is getting power. If it is I would replace the fuse anyway. If it isn't I would trace back from there. From the 97 manual there is a circuit opening relay in the USDS kick panel. It is electrically on the other side of the fuel pump relay using the wire from the FPR (fuel pump relay) terminal on the engine control module. Hope your engine control module isn't bad. Also, would check the IGN fuse in the under dash fuse panel. Just off the top of my head, I think until the engine has oil pressure it won't light either, so maybe that sender is bad. Just guessing.

Bill

 

[bkfj40]

[quote author=Photoman link=board=2;threadid=17321;start=msg168490#msg168490 date=1086283306]
Brian,

First, I would check under the hood at the EFI fuse and make sure one side of the fuse is getting power. If it is I would replace the fuse anyway. If it isn't I would trace back from there. From the 97 manual there is a circuit opening relay in the USDS kick panel. It is electrically on the other side of the fuel pump relay using the wire from the FPR (fuel pump relay) terminal on the engine control module. Hope your engine control module isn't bad. Also, would check the IGN fuse in the under dash fuse panel. Just off the top of my head, I think until the engine has oil pressure it won't light either, so maybe that sender is bad. Just guessing.

Bill
[/quote]

The EFI fuse checks out okay as does the ign fuse
The relay is okay, I need to do some more tracing with the meter to see where my power is stopping. There are lots of pins on the ecm, so it is a matter of sitting down and taking my time to check them against the manual. It's not happening this weekend since I"ll be in Wisconsin for a wedding...

bk

 

[RavenTai]

BK waht was the fix for your problem?

 

[Junk]

Raven, his fix was to spend more time driving the 55.

 

[RavenTai]

LOL nice fix, must be nice to have a stable of cruisers to choose from

 

[Junk]

Raven, actually, saw him over the weekend and he mentioned what it was that fixed it, but since I was running the event I had like 10,003 things on my small brain.

 

[bkfj40]

I did finally chase down my problem...in the second row of seats, drivers side, there is a grommet on the floor board where the wiring harness for the fuel tank goes from inside the vehicle to outside the vehicle...just on the other side of this grommet is a connector in the wiring harness...my connector had a bunch of mud in it and I believe caused it to cause a faulty connection. I replaced the connector, put it in with some dielectric grease, and drove it to work this morning...

Also, I ended up tearing into the wiring harness on the firewall since _all_ the signs pointed to this being the problem. Needless to say, I now have some really nice header wrap around the wiring harness because the stock heat wrap was disintegrated. I believe that it would've been a matter of time before the wiring harness on the firewall would've caused me problems...

The only problem with having a stable of cruisers, is finding the time to do all the maintenance on them...but there is something that brings a smile on my face when wheeling my 55...

http://users.adelphia.net/~bkfj55/jpg_130-3036_IMG.htm

And a big thanks to Junk for the great event put on this past weekend...CMCC 2004 was a great success...I can't wait to go to the event that he's hosting at his house next year

bk

 

[RavenTai]

Nice Pic!, thanks for the info, I think I have mine traced out to near the fuel pump realy, either the relay itself the the harness attached to it,

lookd at the connector you are talign about on my truck it has a bit of dried mud also, going to look inside at some point for some PM

 

[Rookie2]

fuel pump realy, either the relay itself the the harness attached to it,

lookd at the connector you are talign about on my truck it has a bit of dried mud also, going to look inside at some point for some PM

Damn fAvEn.., drink ya anothern.


R2