Replace fuel pump relay now wont start 2006 Odyssey

[Rodolfo]

Hello, will trying to siphon some fuel out of a 2006 Honda Odyssey (touring).

I tried to jump the relay didn’t work then while trying to figure out what terminals on the relay where the coil and contacts. I think I burned the relay
because when I put it back in the car wont not start.

So I went to get a new one. put it in and still it won start. and no fuel pump noise when I turn the key.

any way before I went to get the relay I took the fuel hose that is on the fuel tank and got Gas from there, and used a Jack to ’tilt’ the van.
could this have triggered some kind of safety thing that wont let the car start?

thank you

Topic

[Zac Aleksovski]

Did you check the fuel pump fuse yet?

[Dave Tidman]

[quote=”Mielantra04″ post=193446]Hello, will trying to siphon some fuel out of a 2006 Honda Odyssey (touring).

I tried to jump the relay didn’t work then while trying to figure out what terminals on the relay where the coil and contacts. I think I burned the relay
because when I put it back in the car wont not start.

So I went to get a new one. put it in and still it won start. and no fuel pump noise when I turn the key.
[/quote]

A question, when you jumped the fuel pump relay, did you jump it through a test light or just with a wire? If it was a wire, are you positive you just jumped the load side? The words “while trying to figure out what terminals on the relay where the coil and contacts” scare me a bit, since if you get that wrong and short the control side directly to ground without a load, it can damage the driver in the ecm (ScannerDanner has a bunch of videos on how to safely jump a relay). Hopefully, as a previous poster noted, maybe the fuse blew.

If it is not a fuse, you are going to need a wiring diagram and you will need to work your way through the control and load sides of the circuit to determine where the issue is.

good luck, let us know what you find.

[Rodolfo]

Yes all fuses are good, including the Relay fuse (FUSE 8 under the hood)

[Rodolfo]

Hello yes when I tryed to Jump the pump it was on the Load side.
But I noticed that there is no 12V on the Load side of the relay until the Key is turned and that is when I tried to jump it….dumb

the reason I tried it with out turning the key is on the diagrams I have it says HOT ALL TIMES, this tuned out to NOT BE TRUE. so I know I did not cause any damage to the pump at least .

[Rodolfo]

Also, I followed all the Circuit in the image and I have all the voltages, As for the ECM terminal I get 5V for a couple of seconds and 12V onthe other side so the relay powers up with 7V ( NOW I KNOW WHY I BURNT IT I TESTED IT WITH 12V 🙁 ) .

Followed the circuit for continuity, in case of wiring issues. with KEY OFF

then with the Key ON, it was 1am so I decided to continue today.

Check list for TODAY is
::- Confirm the RElay output gives 12 V
::- Follow the 12V all the way to the PUMP.

Any inputs welcome and Thank YOU!!

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[Rodolfo]

Situation Report!….

Al wiring is OK
Voltages OK..

But for some reason the NEW relay does not actuate. .
like before i checked the voltage coming from ECM at the moment I turn key and it reads 5Volts for a couple of seconds. after measuring the voltage drop a cross the coil it reads about 1 Volt but still contact do not close.

Question for every body here how much resistance (OHMS) should the coil read I’m getting 90Ohms in the new relay I measured all the other relays in the circuit and theu between 120 OHMS and 150OHMS coul I have gotten wrong relay ? the brand is DENSO from O’reilly with coil voltage 12V?

IDEAS?

PS
i really hipe it is not the ECM driver output

[Dave Tidman]

Well, it is orielly’s, it could have been the wrong relay. I’ve had issues with these stores (Advance, AZ, etc.) where the part in the box is not the part listed on the box. I have also had parts that were just bad out of the box. It might be worth a try to get another one and see if you have the same results.

Are you able to bench test the relay to see if it closes (and at what voltage)?
Good luck.

[Rodolfo]

Yes I will check that today at work, Also I noticed that the same relay is called for the ACcura TL, and one of my friends has one I try to get him to lend me his relay to check the OHMS in the coil. or even to put in my van see what happens

For now I took the old relay apart, and then “locked” the contacts together essentially, jumping the fuel pump. and that is how I’m driving now.

[Zac Aleksovski]

On GM vehicles I’ve worked on, the relay for the cooling fans is the same PN as the fuel pump. Don’t know if Honda does that or not. Easy swap to test. Just remember to swap back!

[Rodolfo]

Hello, I Just tested the the relay out of an 2008 Accura TL (same part number for the relay)
the Coil reads ~55 Ohms, the part I got from Oreilly reads 90 Ohms so current is not the Issue.
Also I put the Part I got from Oreilly ( DENSO 156700-2780, or 39794-SDA-004)

in my friends Acura it runs with no problems,
I also took a Voltage reading I get 12V solid to the coil terminals.

So I guess I damaged the ECM driver, 🙁 :(,

Has anybody heard about repairing ECMs ???

Hope the info ins this thread helps somebody else.. if you are having some similar problem and have a questions about what NOT to do let me know, JE

Thank you for your input,

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[Rodolfo]

I measured again yesterday and I do get 5V from ECM side every time the Fuel Pump is supposed to be ON. I will make a small circuit and Optoisolator and external transistor and see if I can avoid having to ‘Jump’ the Fuel Pump.

Someting like the picture when I try it I’ll let you know if it works

Cheers!!

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• 1ec5a751804575d55f90bb96a90a2736

[Zac Aleksovski]

You are getting the voltage for relay activation to the terminal in the fuse block? Is there good contact from the fuse block to the relay? Maybe the connector got spread open enough not to make good contact.

[Author]

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