Another EFI Relay Thread..HELP!! (1 Viewer)

[FrankTorres]

I must ad that even though I did all that fancy rewiring to the EFI circuit years ago, the fix did not last and after a few years the "No CEL & no start" when hot, was back...

My permanent fix was to do what voorland80 mentions in his cross thread link. I made a pigtail and relocated the EFI relay inside the cab where it stays cooler.

I hate to cross post but here is the thread from back in August 2007...

Just a small cut out for the wiring coming out of the box then straight through the firewall.

 

[Michael Hanson]

Its a shame that with all these posts for all these years Toyota has not given us the answer.This is their most expensive truck :you would think that they would have taken more pride in their work to have let this go on for 19 years. Maybe with Toyota posting 26 % sales losses,they might give better service. Mike

 

[jonheld]

Here's a cut and paste from my writeup:

"Many have said that the wire from the EFI fuse to the EFI relay is undersized and is the root cause of all these problems. I’m not sure about this. At 2500 RPM I measured 6.25 amps across the load side of the EFI relay contacts. I believe the cause of the problems is related to the heat of the manifold combined with poor crimps on the connectors in the fuse box. Over time these connectors can become corroded and cause problems."

Fusebox Relay Contacts - 82998-12060
Fusebox Blade Fuse Contacts - 82998-12140

"These OEM contacts that snap into the fuse box are available as "wiring harness repair" parts from Tojo. They come crimped onto 6" pigtails which I was able to remove and soldered on #10 and #12 high temp wire (McMaster #7304K17 and 7304K16)."

"The wires I removed were crusty and brittle from the heat of both the EFI circuit and the exhaust manifold. While I was there I replaced the stock EFI relay with one from a Camry. It is a drop in replacement and the part # is 28300-16010."

FWIW, this was done about 3 or 4 years ago, the EFI relay lives in it's stock location and has been fine since.

 

[Michael Hanson]

Do you remember what the trick is to getting the old ones out? Mike

 

[alkaline747trio]

Can you get replacements that would 'plug' right in and replace the crusty wires with the same size but newer wire? Or are the pigtail'd connectors the only thing available?

 

[jonheld]

Can you get replacements that would 'plug' right in and replace the crusty wires with the same size but newer wire? Or are the pigtail'd connectors the only thing available?

AFAIK, these "repair" parts are the only availabe items. They work very well and are a direct replacement for the contacts in the fusebox. Like it says in my wrieup, I needed to fabricate a pick to safely remove the old contacts from the box.

 

[voorland80]

EFI relay

I must ad that even though I did all that fancy rewiring to the EFI circuit years ago, the fix did not last and after a few years the "No CEL & no start" when hot, was back...

My permanent fix was to do what voorland80 mentions in his cross thread link. I made a pigtail and relocated the EFI relay inside the cab where it stays cooler.

I hate to cross post but here is the thread from back in August 2007...

Just a small cut out for the wiring coming out of the box then straight through the firewall.

Thanks Frank, after reading what you did I thought,
"That's a good idea!" I became determined to not ever let it die on me again. Not if I could help it.

Having the EFI relay installed in the AC duct under the dash made all the difference through the hot summer. It NEVER became hot again, even if I ran only the fan. Now that cold weather is coming on, I've noticed that with the heater fan blowing, even the warm air helps to keep the relay cool. I've not driven it far in the cold, but I plan still to remove the relay, plug the duct and possibly attach a heat sink to the relay - but leave it inside the cab.

Maybe I shouldn't take the mick on the Toyota dealer but when I inquired about the relay problem they looked at me as if I didn't know what I was bringing up. They looked annoyed and indifferent. I can appreciate what Mike has stated. They were not helpful in the least.

 

[abclin]

a little late to the party but.... i thought that a probable cause might be that the engine fan when it rotates throws alot of the engine compartment heat to that side of the engine bay right onto the area of the relay. disclamer, i am not a mechanic and i dont play one on tv