The alternator fuse has no power going to is now. It is also not blown.

 

Looked at the alternator and the Positive cable connection on it was loose. There was a charging issue.

Still not advancing the timing. And its backfiring into the intake as well. Not sure if I stated that before or not.

 

The alternator fuse (80A, shown as Gen here) powers almost everything else. It also connects direct to the battery, so if you have no power TO the alt fuse then something has come loose.

 

Yep Just checked the Connections at the alternator and they were loose. Thanks for the heads up. So that took care of that issue. Not we still are not advancing the timing for some reason.

The last component that we have yet to swap out is the Igniter for the coil. I thought that I had an extra one laying around somewhere, but we cannot find it.

 

We are going to take off the upper intake and trace all the wiring. The more I think about it, the more I feel like there is a broken/ pinched wire somewhere in the harness.

I think this because the CEL immediately comes on even after resetting the system for long periods of time.

 

Subscribed for sure........

 

did the ecu ground wires get hooked back up? They are attached where the upper and lower intake manifold meet. Its 4 brown wires that go into two loops.

 

Yeah. That was one of the first things I checked as he had the intake off. I also added a ground to that spot today to see if it would help but the same issue is there.

 

I am leaning toward a broken wire or loose connection from being moved around.

As the code comes back as soon as you connect the battery.

I would look to see you have good connections from the Igniter to the distributor no bent pins or corroded ones.

That would cause the no advance issue.

 

Found a broken wire in the harness. It's a white with red. Looks like it goes into a soldered 4-1 wire back to the ecu. We are looking at the wiring diagram now. But here's a picture.

 

Found it!! The wire feeds to the AFM. Broken in the loom where it rests on the fuel rail. It must have broken and pulled out when moving the harness to get the upper intake on.

AFM side

 

Well. The truck is up and running perfect as it should now.

I am updating this thread in the event that someone else has the same issue with the Code 31 in their 22RE pickup/4runner.


I know exactly how this happened.

When removing the Upper Intake from the 22Re, you have to deal with the engine harness running in between the intakes. When we removed for further inspection, you could see where the harness had been rubbing on the fuel rail for quite some time. I decided that we should open the harness and go through all the wires. Upon first glance, there was no noticeable damage or loose wires. But after a few minutes of digging further into the harness, and actually uncovering another loomed up section that rides on the fuel rail, I found the broken wire.

What led me to believe that it was a broken wire was that the CEL would instantly come on after resetting the ECU with the battery disconnected. There was no delay or drive cycle for it to trip, just instantly on.

This happened when we were installing the upper intake last week and moved/pushed the harness down to gain a clear shot at the lower upper intake bolts. When this happened, it put a strain on the harness, that was literally riding on the fuel rail, and pulled the AFM wire away from the 5-1 crimp. What a relief.

Now onto the repair. Like a rookie, I did not take any photos of the repair. I was just wanting to get it together and see how it would run.

There is a crimp that holds 5 wires together. They are all 5 White/red wires with 4 into 1 white/red that heads back to the ECU.

The hanes manual we have did not represent this wire coming from the AFM to the ECU. In fact it did not have it in the diagram at all. So I traced it back through the loom to where it broke from the AFM. We decided to use an electrical harness connector and then heat shrink everything back together.

After we re-wrapped the entire harness back together making sure that it was nice and tight. After doing this it was clear that we had created more room for the harness to sit in between the Upper intake, lower intake and fuel rail.

Which I feel is an issue that everything was crammed in there to begin with.
Top that off with 23+ year old wiring, and you are in for a potential issue.

So after resetting the TPS for what seemed like the 100th time, got her back together, he test drove it and came back with a smile on his face.

I think that he and I learned a valuable lesson, and that's not to give up, keep trying every angle, ask for help when you need it, take all the advice you can get, and again never give up!!


Thanks for all the help guys. Its greatly appreciated. This one threw me for a loop

 

An OPEN loop, no less

 

HAHAHAHAHAHAHA Totally!!

 

Great job on finding the broken wire in the bowl of spaghetti they call a wiring harness. Chasing wires is frustrating on these but it feels good getting it fixed. Great job guys!!!

 

Thanks Terry! It felt good to get it squared away and seeing him happy driving it again.

 

Great story...I had a teacher like you once and he helped me to build my first car!

Keep up the good work.