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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 02-02-2008, 11:29 AM   #1
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1993 toyota pickup NO START 22re

I have a 93 toyota pick up with a 22re.The problem I am having is the truck will not start.It is an electrical/fuel problem i think.If I jump the (Fp) to (+B) pins in the diagnostic port the truck starts right up but runs a little rough.I have replaced a lot of parts to try and fix.The parts I replaced are fuel pump, sending unit, fuel filter, air flow meter, cold start injector, and computer. Are there any other suggestions you guys might have.Any help you guys could give me to steer me in the right direction would be greatly appreciated.
Thanks Newbie
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Old 02-02-2008, 11:59 AM   #2
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Have you checked the timing at any point?
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Old 02-02-2008, 12:09 PM   #3
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yes.Its right on
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Old 02-02-2008, 12:53 PM   #4
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I'd get the electrical diagram... trace the line that provides B+ (including the fuse). It does sound like the fuel pump is not being driven. Probably a relay involved in that circuit as well. Likely suspects are fuse, relay, connections and lastly broken wires.. roughly in that order.
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Old 02-02-2008, 09:49 PM   #5
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this is gonna sound really stupid, but check your starter ground cable. comes off the battery, goes to the starter. tighten it on there real good. mine was loose, I'd have to get out and move it so it would ground right, and it would start every time... sort of...
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Old 02-03-2008, 08:53 PM   #6
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The problem I am having is the truck will not start.
What do you mean by not starting? Does the engine crank, but not run or does the engine not even crank over at all?


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It is an electrical/fuel problem i think.If I jump the (Fp) to (+B) pins in the diagnostic port the truck starts right up but runs a little rough.
I'm not sure what component cycles on by jumping FP to B+, but I have a good idea that it's the fuel pump. You're going to pissed, but I think your problem is just a bad circuit opening relay (fuel pump relay). Jumping the fuel pump connection bypasses both the circuit opening relay and the air flow meter, cycling the fuel pump on. That's why the truck runs when it's jumped.

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Old 02-04-2008, 10:17 AM   #7
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Got the same problem I had. If it was the Fuel pump relay it would not start even jumping the terminals, In the VAMF sensor on top of your air box there is a sensor or switch that starts the fuel pump when the baffle plate inside moves when you crank the engine. Replace your VAMF and truck should start fine, learned this the hard way on my 91.
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Old 02-04-2008, 10:49 AM   #8
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Got the same problem I had. If it was the Fuel pump relay it would not start even jumping the terminals, In the VAMF sensor on top of your air box there is a sensor or switch that starts the fuel pump when the baffle plate inside moves when you crank the engine. Replace your VAMF and truck should start fine, learned this the hard way on my 91.

The relay is activated by the switch at the VAFM. If the switch on the VAFM is broken, then your pump won't run. If you look at the wiring diagram, you can actually figure out what gets closed when air flow is detected.

There is no relay on the AFM that runs the fuel pump.
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Old 02-04-2008, 12:21 PM   #9
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If you are talking about the air flow meter on the air box. I already tried that.I took one off another truck just to try and I had the same results.The truck will crank but no start.If I jump those pins in the diagnostic port, it starts right up, just runs a little rough.I am baffled, i dont know what to try next.Keep em comin guys I appreciate all the help.
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Old 02-04-2008, 12:46 PM   #10
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Have you physically moved the AFM flapper with the key in the ON position and the AFM hooked up? When you do so, you should hear the pump come on.

You need the wiring diagram from a 1993. When air flows, you're closing the connection between two wires on the AFM. This is a ground circuit and it turns on the fuel pump relay.

If the AFM "switch" is working, you've either got a bad ground or broken connection on one of those two wires. You'd need a diagram to trace it.
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Old 02-04-2008, 01:26 PM   #11
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Thanks I will try that right now
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Old 02-04-2008, 02:22 PM   #12
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ok, when I push the flapper the pump does not run.Like i said i tried a new afm.So it must be wiring.Where do i go from here.
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Old 02-04-2008, 02:44 PM   #13
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Wiring diagram. Check continuity from AFM connector to the relay that powers the fuel pump.

I have a 1st gen. Without a wiring diagram, I can't point you in the right direction.
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Old 02-04-2008, 02:51 PM   #14
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thanks for all the help. I have a haynes manual in front of me trying to figure it out. Its not the best diagram but hopefully it will do.I will keep you informed
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Old 02-04-2008, 04:22 PM   #15
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Might check 4x4 wire for the 93 manual, also...
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Old 02-04-2008, 05:56 PM   #16
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found the problem. it was the circuit opening relay. it was full of water.
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Old 02-04-2008, 06:23 PM   #17
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i think that deserves a cold one!
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Old 02-04-2008, 06:44 PM   #18
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yeah it does. I didnt think I would ever figure the problem out
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Old 02-05-2008, 06:48 AM   #19
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hmmmm.... duplicate
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Old 02-05-2008, 06:49 AM   #20
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thanks for all the help.
You are welcome!
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Old 02-05-2008, 06:49 AM
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1993, 22re, crankshaft, diagram, find, fuel, pick, pickup, pump, relay, sending, sensor, toyota, unit, wiring

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