Error code 31 on JDM Swap 2jz

[deazndude]

Error code 31 is a MAF issue on the tsrm, but I read elsewhere that for JDM swaps that it is related to the MAP sensor. But from there on i don't know how to exactly to find out what the problem is. It just popped up the code one day as soon as I started the car. I even reset the ECU to check to make sure it wasn't a random code, sure enough it came back on and my idle is nasty. Where do I go from here? Can i use a volt meter to test it's resistance, power, and whatnot?

 

[hvyman]

1 wire should have have 5v, 1 will have ground, and another should have a 0-5v signal.-At idle should be around 1v or less iirc

 

[deazndude]

So i started testing the wires. I used the test light to test for ground, and it was a lot fainter than when you put the test light on the positive terminal, but it's there and seems to be working. The center wire that was suppose to be 5 volts is only 2.8, and if i blow or suck on the hose, it changes slightly. I never tested the left one, but i can if you need me to. Does this mean my MAP sensor is broken?

 

[hvyman]

red wire is going to be 5v with key on. yellow wire will be signal which will be between 0-5v and yes it will changes if you suck or blow. brown wire will be ground.

 

[deazndude]

In the on Position the middle wire showed 2.8 volts. The ground works. And I haven't tested the left wire. I will when I get home.

 

[hvyman]

NMake sure the grounds on theintake manifold are good.

 

[deazndude]

Any idea where those ground are? It just runs into the harness. I'm totally lost in all this. I forgot to say thanks, you also helped me out in the other thread.

 

[hvyman]

The go to the Ecu. As long as there bolted to the manifold your good.

 

[deazndude]

It's mounted onto the intake manifold now, did you mean to tell me to cut the ground wire going to the ECU, and remounting into the intake manifold to create a new ground?

 

[hvyman]

No there should be ground bolted to the intake manifold. If there not they need to be. Dont cut them.

 

[deazndude]

I can only see one ground, it seems pretty thick to me.

 

[hvyman]

I would check over the harness and manifold down in there then. Iirc there is 2 seperate eyelets that have about 4 brown wires each grounded to the itnake manifold.

 

[jesse_rc1991]

If its reading 2.8v thats what its supposed to read on KOEO so it sounds like your wiring is good. Next i would hook up a vacuum pump on the sensor nipple and see if it holds vacuum, if not sensor bad. Also it could be a fault in the ecu. My 2jzgte aristo was throwing the same code as well and all my other things checked out fine until i finally decided to swap ecu's which remedied the problem.

 

[deazndude]

Well, I appear to be the biggest idiot ever. After popping open the ecu, finding the all the ground points, and everything else i tried. The problem was with my AVCR messing up, I redid the wiring and reset the settings and everything works, no more codes. Thanks for the help guys.