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Old 05-10-2010, 08:33 AM   #1 (permalink)
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Test Circuit Open Relay and EFI RElay

My truck wont stay running. I jumped the Fp adn B+ terminals and I can hear the fuel pump running. I then start the truck with the terminals jumped and the truck runs fine....I pull the jump and it dies.
This is telling me its either the Circuit OPen Relay or the EFI Relay...or soem wiring issues, which I dont think it is....

How can I test the COR and EFI....can I Ohms test it....if so how and what temrinals to I test etc? Are there specs out there?
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Old 05-10-2010, 12:13 PM   #2 (permalink)
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I found these numbers for ohms testing of the Circuit Open relay but dont know if they are for my year...

1992 toyota pickup, 3.0 4x4



If problems suspected, test the relay resistances (relay removed from socket) as follows:

STA - E1 = 17 - 25 ohms
+B - Fc = 88 - 132 ohms
+B - Fp = Infinite ohms (i.e. open circuit) w/ relay off
+B - Fp = 0 ohms w/ relay on
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Old 05-10-2010, 12:41 PM   #3 (permalink)
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See:
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump
- http://www.4crawler.com/4x4/CheapTri...ORelayLocation

Resistances should be similar, the coils should measure some resistance, if open or short, they are gone.
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Old 05-10-2010, 12:44 PM   #4 (permalink)
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well now that we know the year and engine of your truck that helps...if i have time ill pull up some info on TIS...im kinda busy right now. im sure the info is in any service manual, ie: chiltons or haynes
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Old 05-10-2010, 01:14 PM   #5 (permalink)
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SHOULD BE:
STA - E1 = 17 - 25 ohms
+B - Fc = 88 - 132 ohms
+B - Fp = Infinite ohms (i.e. open circuit) w/ relay off
+B - Fp = 0 ohms w/ relay on

actual tested with ohms meter
STA - E1 = 25.9 ohms
+B - Fc = Infinite ohms ohms
+B - Fp = Infinite ohms (i.e. open circuit) w/ relay off

I am thinking this relay is shot....but first time at this....

To test to make sure power is coming into the Circuit opening relay I assume that with the relay out of the truck I can test the wire coming into the Fp....think the wire is blue? Thsi will at least tell me that the EFI is supplying power to the COR?

There is also some rust that seems to be coming from inside the relay...looks like some water got in there....

Last edited by jaykappy; 05-10-2010 at 01:16 PM.
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Old 05-10-2010, 01:59 PM   #6 (permalink)
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if your meter is reading infinite, or OL, or OFL when you should have some resistance, then it sounds like there is an open in the coil part of the relay. replace it and be done.
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Old 05-10-2010, 07:36 PM   #7 (permalink)
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the easy way to check it in the car is.
1. unplug starter solenoid wire. turn ignition to start. does the relay click.
2. unlatch AFM like you are going to change the air filter, with the key ON, reach a finger and move the flapper. does the relay click?

sounds to me like the AFM isnt activating the relay, so its the relay, the wiring, or the switch in the AFM.
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hold this...

Last edited by gnob; 05-10-2010 at 07:37 PM.
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Old 05-11-2010, 07:21 AM   #8 (permalink)
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Thank you all for your thoughts...

As mentioned I ohms tested the relay and came up with infinate on the +B - Fc....should of had some resistance 88-132 ohms
I also noticed rust coming from the relay and some build up etc...
I went to Toyota, grabbed a relay and tested with my Ohms meter. I got 141 Ohms at the location where mine was infinate and all others passed.
Took it home, plugged it in and presto....started up and ran....

I DID notice that where the COR is mounted it is just inside the Fender...RIGHT above it is the antenna....the base of mine is bend and allows some water to get through....It makes sense now...the Truck would run like crap when it was raining outside etc. I am goin to go home today and try to look for another location to mount it....if not going to cut a hole in my glove box and put it in there....I think my problem is water rusting out the relay...

THANKS AGAIN ALL OF YOU...YOUR HELP IS VERY APPRECIATED......

Last edited by jaykappy; 05-11-2010 at 07:23 AM.
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