Code 31 & 41 on 2jz

[phil.g.]

Hi all,

My mate lol has a code 31 & 41 on his 95 supra, it was a non turbo but has been converted to a single turbo, he's put on a polished inlet with a reverse tps but now has 31 & 41 codes and its hunting massively,

Does anyone know if the reverse tps is plug and play or does it need wires swapping and how does he set it up?

Any help would be great,

Thanks,

Phil.

[Mike2JZ]

What engine management is he using? Is he using an adapter to use the stock TPS on the polished inlet?

[phil.g.]

No adaptor for the tps it's a straight plug in, I'll ask him now what Ecu it is.

 

 

 

[phil.g.]

Should have mentioned the tps came with the throttle body, so runs reveres too.

 

 

 

[Mike2JZ]

No adaptor for the tps it's a straight plug in, I'll ask him now what Ecu it is.

 

 

/QUOTE]

 

By polished inlet do you mean a stock polished intake from an NA? Or is using a TT inlet or aftermarket plenum?

 

There is a difference in the TPS's used between NA's & TT's.

 

Can't remember off the top of my head, but the NA TPS will spin clockwise and TT's anticlockwise (or vice versa). So they are not compatible in that respect, presumably this would also cause some differences for the stock ECU reading of the TPS. (shouldnt be an issue on standalone as you can remap the TPS input values)

[Nodalmighty]

Can you not fit the NA TPS on the new throttle body.

 

Should have mentioned the tps came with the throttle body, so runs reveres too.

 

 

/QUOTE]

[Nodalmighty]

Both of those code relate to the 5v sensors which might give a clue as to the problem. Did he crimp a wire/loom in the manifold when it was fitted?

[phil.g.]

He said it has what he thinks is the stock Ecu and a blue greedy E-management ecu next to it,

It's a after market plenum with a 90mm throttle body, the tps came with the throttle body so runs reveres too,

It was running ok till he changed the inlet, I'll get him to look see if he's trapped a wire but he's not home till later,

Thanks very much again for the replies,

Phil.

 

 

 

 

[phil.g.]

If he's not trapped a wire, what else can he look for,

Thanks again,

Phil.

 

 

 

[phil.g.]

Ok quick update,

We both checked all around the inlet for any trapped wires, there is Defo no trapped wires,

We had the battery off all night to reset the Ecu and fitted a stock tps (just to try) but the codes were still there and it was still hunting,

Nodalmighty what do you mean the 5v sensors?

Thanks,

Phil.

 

 

 

[Mike2JZ]

On your TPS plug, the VC pin supplies +5v.

[phil.g.]

He's in now so I'll get him to check, is it just a case of unplugging it and checking for 5v?

 

 

 

[phil.g.]

Obviously with the ignition on.

 

 

 

[Nodalmighty]

The TPS and the Map sensor both run off 5v circuit VC. Just check the 5v and sensor ground and make sure you have both.

[phil.g.]

Just been round to his house again, checked the wires and the vc has 5.08v and the negative is also good, so I tried the stock tps once more and it was the same until I turned the tick over down on the new throttle body and the revs evened out and sounded correct, I rev'd the stock throttle body with the stock tps and the new throttle body at the same time and the revs went up spot on,

So it's all down to the reverse tps on the new throttle body, will that need mapping or is there a way round it?

Thanks very much for the help so far guys, he's cheered up a bit now,

Phil.

 

 

 

[Nodalmighty]

Have you tried looking at the signal from the tps to see if it goes 5v to 0v or 0v to 5v when you turn the throttle butterfly? If it's the latter then it's correct, if it's the other you should just swap the 5v and 0v pins in the connector. The sensor will need to plugged in to test it, just stick a needle down behind the rubber bung until you feel it connect.

[phil.g.]

Hmm sounds like a plan, I have read somewhere about swapping over some wires but not for a supra,

Which wires am I looking a, the 2 middle ones? Or the 5v with which wire?

Thanks,

Phil.

 

 

 

[phil.g.]

Is it the IDL and the E2 pins?

 

 

 

[Mike2JZ]

Swap VC (+5v) & E2 (ground)

[phil.g.]

Ah I see, I'll pop round now and let you know what I find,

Thanks very much again,

Phil.

 

 

 

[phil.g.]

Another update,

I've had a look with my mate, we found that on tick over it's fine but when rev'd it started hunting, I swapping the 2 end one round (5v and negative) but that never did anything, I found that it was reading 4.98 closed and went down as the butterfly opened, I tried swapping a few more over but it's still the same,

I did find that when the tps plug was off it would rev properly?

Any ideas what to do next?

Thanks again,

Phil.

[Nodalmighty]

Yours is Back to Front it should be 0v to 5v

 

Basically it should be (according to Toyota wiring diagrams) pinned thus:

 

Pin 1 = Sensor Ground (Brown/Black Stripe)

Pin 2 = Idle (Red)

Pin 3 = VTA Signal (yellow)

Pin 4 = 5V (Light Blue/Red Stripe)

[phil.g.]

Thanks very much for that, I'll get back on it tomorrow, he's gone out now, I'm sure I can sort it out with the info you gave me,

Thanks once again for all the advise, I'll update tomorrow,

Phil.

 

 

 

[phil.g.]

The saga continues,

We checked the voltage again this morning and it went from 2.3v -19v how that's possible I don't know, unless there's something wrong with my multi meter,

The volts are ok now the wires are swapped over, closed it reads 1.35v open it reads 5.08v it's ok on tick over BUT it's won't rev up, it starts hunting, let off the throttle and it's fine again on tick over,

It still has codes 31 and 41

Does leaving the battery off over night reset the Ecu?

Thanks,

Phil.

 

 

 

[Nodalmighty]

This sounds like it's locked in idle mode. Does it get to about 2k and start bouncing like a rev limiter? I work in Derby (Pride Park) are you local?