COR relay not turning fuel pump on? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 10-07-2018, 03:27 AM   #1 (permalink)
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COR relay not turning fuel pump on?

I'm working on a 1990 Toyota Pickup 22re which has electrical problems. Long story short, the COR relay is not turning on the fuel pump. Exactly what needs to happen for the Air FlowMeter to get the COR relay working to send voltage to the fuel pump? If you can help, I can wright down what happened from the start. I have been trying to get this truck started for approximately a month now. Thank you, Tommy.
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Old 10-07-2018, 08:55 AM   #2 (permalink)
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guess ya failed to read the stickies when ya 1 post wondered the site....
this needs to be in the Newbie section
Buy a manual trace the power back from pump to battery.
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Old 10-07-2018, 11:18 AM   #3 (permalink)
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COR relay not turning fuel pump on?

Sorry for posting in the wrong area. I'm just so tired of trying to get this truck running. I do have a repair manual that I'm using, however, I'm still having a difficult time trying to get the engine running. Exactly where should I repost my situation? I sure hope someone on this forum can support me with this. Thank you for your support.
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Old 10-07-2018, 12:11 PM   #4 (permalink)
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Start by reading the stickies and site newbies check in here first....
You are in the hard core section, not the newbies "please help me" section...
We may "hold your hand" however spoon feeding on the first post IS a LONGSHOT.
You test the cor yet?
I dunno if a haynes book shows this procedure...
Brb

What are you doing?
Re swap?
Fixing a fubared elect. System the prior owner dicked up?
Or learning how to wrench on junk?

Slow day in the shop, so ....
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Last edited by clb 017; 10-07-2018 at 12:15 PM.
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Old 10-07-2018, 03:07 PM   #5 (permalink)
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COR relay not turning fuel pump on?

I will read the stickies newbies section next. The problem started when the alarm system shorted out causing a lot of damage with the ignition system. So, I'm trying to repair that system. The engine does not start. So far, I had to run two temporary jumpers to get voltage to the COR relay. I did check the COR relay, it checked out ok. I also checked the air flow meter. I'm getting 101.5 on the Vb-Vc pins. 150 on the E2-Vs pins. 182 on the E2-Vc pins. 282 on the E2-Vb pins. 1,745 on the E2-THA pins. And Infinity on the E1-Fc pins. It appears that the air flow meter is not grounding out the COR relay. So, I'm not getting voltage at the fuel pump. This is what I need help on. Thank you, Tommy.
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Old 10-11-2018, 07:09 PM   #6 (permalink)
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The problem may be the black with red dash wire not getting power. the circuit open relay I believe sends power to all, not to the afm first. but all together as a parallel circuit. afm gets power along with all the other ign hot, fuel comes on for a few seconds, after that the power to the fuel pump is reliant on the afm. Does it start then die? may be afm issue by itself. I have seen afm issues cause by bad alternators. You may have damaged wires coming off ign wires. maybe the scotch locks they used also allowed the wires to corrode. being that we do not know the conditions the truck lives in.
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Old 10-12-2018, 05:28 AM   #7 (permalink)
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The AFM will show infinity there unless cracked.
I would imagine your Start wire is damaged. The COR has two different pulling sides.
If you do not have one, get the proper wiring diagram
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