Hello to all. I am new here and in need of some tech help. i have a 85 pickup with 22re my fuel injectors are not firing, they are getting power but on both sides of the plug, a friends yota gets power to only one side of the plugs, I was told that it could be in the the dist or the fuel relay?? How do we know any advice would help alot thanks.. Charles

 

Injectors are grounded via the No10 and No20 terminals at the ECU. Check that the ECU is grounded and that you have continuity between the No10 and No20 terminals and the injectors.

 

Thanks I'll see what i can figure out.

 

Hey guys,
This is the poor son of a @$#% that's workin on the truck. I'm a little new to yotas myself. How do we figure out which terminal is which. The books we have tell you to go to such and such terminal but they don't tell you how to find them. I even bought a subscription for it on All Data. NOPE! I guess we need a factory service manual? Or is there a good source for that info online? Any help is greatly appreciated. Thanks.

Steve

 

I have the '85 ECU piniouts on my web page:
http://www.4crawler.com/4x4/CheapTri...roubleshooting

This is from the FSM.

 

Just to clarify. We're not having a problem with component location. We just need to identify the terminals on each connector so we can shoot wires.

 

Thanks!!!

 

The FSM shows most of the connectors w/ pinouts as well as wire colors in the wiring diagram:
- http://www.4crawler.com/4x4/FSM.shtml

 

Hey....

Pretty stumped here. We've got intermitent power at both terminals for each fuel injector. Pulled the computer apart and from the looks of the circuit board the no. 10 and no. 20 just make a loop in the computer. Both terminals go to the ground side of the injectors. Pulled the wiring harness apart too. I don't see were the ground comes in. All wires have continuity and there is continuity through the no.10-no.20 terminals in the computer. They don't go to ground though. All four wires on the ground side of each fuel injector connect to the two wires which come from the no. 10 and no. 20 terminals on the computer. It doesn't make any sense. But If I ohm between the injecotors and the body ground I get 2.7 ohms. It should be fully grounded, should it not?

 

All 4 injectors are fed power though the ballast resistor on the passenger fender. Then they all ground through the ECU. The No10 and No20 connections are pulled to ground by the ECU to turn on the injector and left floating to turn them off.

 

We pulled the computer and stuck in an identical truck. The truck fired right up. So that eliminates one possibility. I think the problem may be in the harness.

 

Might want to have a look at this thread:
http://www.4x4wire.com/forums/showfl...=&fpart=1&vc=1

 

OK, we're making progress. I fixed a ground and cleaned up some stuff so the injectors should have what they need but they still don't shoo fuel. It just sprays from around the o-rings. I ohmed the injectors and all were 2.4 but I guess that doesn't guarantee they're good. I wish I had some spares or a way to test them at home. I may just next day them to Witch Hunter and be done with it.

If they were plugged would they still buzz? Because they don't.

I read all of the threads you've posted. Thanks for the help.

 

Omh test says the windings are fine. I don't think they should make any noise aside from the initial click as the open and close. Basically just like a relay. Well worth having them cleaned, tested and flow balanced, I used RC Engr:
- http://www.4crawler.com/4x4/CheapTri...html#Injectors

 

Well I had the injectors tested today. They squirt like champs.
Tested computer
Tested resistor
checked for continuity in the wire harness

What tells the computer when to fire the injectors? A local guy is trying to tell me it's in the distributor. Is it that or does it have a cam or crank position sensor?

 

It’s called the signal generator. On my 84, it's the green plug coming out of the distributor. 140-180 ohms.

 

the distributor sends a signal to the igniter which sends the signal to the computer thru the 3-wire plug coming out of it, make sure those wires are not broken, they come close to the exhaust manifold and will get hard and break over time...

 

So I need to check resistance through the signal gernerator and it's 140-180 ohms? Wow that's alot of resistance isn't it?

How do I test the ignitor?

Thanks for the help guys.

 

All data tells me how to check the ignitor for output to the coil but not to the ECM.

 

I show the ECU connector pinouts on the following web page:
- http://www.4crawler.com/4x4/CheapTri...roubleshooting

And the Factory Service Manual has an extensive section on troubleshooting no-start problems as well as testing the ECU connections:
- http://www.4crawler.com/4x4/FSM.shtml