Need some help with wiring Q45 TPS to 7MGTE harness

[whitemike]

I'm trying to hook up this stupid Nissan TPS until I grab a 7m TPS and the Beech adapter. Please don't reply telling me to ditch it because I need it to work as-is due to me moving on Monday. Once i get where I'm going I can go 7m TPS.

So,
I've followed these threads perfectly:
http://forums.celicasupra.com/showt...e-Body-to-7M-TPS-Wiring-Instructions&p=608314
http://www.supramania.com/forums/sh...TPS-wiring-for-a-Q45-throttle-body-on-a-Supra

I have it wired exactly like this diagram:

I'm still seeing a code 51. Is the TPS bad? I have tested the wires.. there's always continuity between the E2 and IDL contacts on the TPS. No matter what/how I adjust.

Any help is appreciated. Thanks.

Mike

 

[89supracrazy]

With the tps unplugged it still reads continuity any position between e2 and idl. It should not read until it is in the rest position. Ok if you plug it up and back probe the e2 and idl it should be between 4-6 volt with the throttle valve open. It sounds like the switch is messed up inside.

 

[whitemike]

With the tps unplugged it still reads continuity any position between e2 and idl. It should not read until it is in the rest position. Ok if you plug it up and back probe the e2 and idl it should be between 4-6 volt with the throttle valve open. It sounds like the switch is messed up inside.

There's ALWAYS continuity. I'm looking for a new one.

 

[CT26smoker]

Why not just put the original Toyota TPS on the Q45 throttle?
The adaptor is jut $25.
To me, $25 is not worth chassing gremlins.........

 

[whitemike]

I even put at the very top of the thread so I wouldn't get any replies like this. Even if you skimmed I don't see how you could've missed this.

Why not just put the original Toyota TPS on the Q45 throttle?
The adaptor is jut $25.
To me, $25 is not worth chassing gremlins.........

I'm trying to hook up this stupid Nissan TPS until I grab a 7m TPS and the Beech adapter. Please don't reply telling me to ditch it because I need it to work as-is due to me moving on Monday. Once i get where I'm going I can go 7m TPS.

I'm moving. I don't have time to source a 7m tps and wait for the adapter. I guess this is how you made it into my sig the first time huh?

 

[89supracrazy]

Have you tried tapping on it to see if the switch is stuck. Maybe if might free it up if you haven't tried it yet.

 

[whitemike]

Have you tried tapping on it to see if the switch is stuck. Maybe if might free it up if you haven't tried it yet.

I have

 

[89supracrazy]

I know I might be asking some questions that you have already tried but also have you took it off the throttle body to see if it checks out. Maybe the butterfly tips isn't actually turning the tps. I was thinking maybe someone has taken it off and reinstalled improperly. Just a thought.

 

[whitemike]

I know I might be asking some questions that you have already tried but also have you took it off the throttle body to see if it checks out. Maybe the butterfly tips isn't actually turning the tps. I was thinking maybe someone has taken it off and reinstalled improperly. Just a thought.

Yea I checked it out. The Q45 has a peg with a notch in it, so the TPS can literally only go on one way. Also, the voltages increase as the tps is rotated, just the IDL switch never breaks continuity.

 

[89supracrazy]

It sounds like it is doomed. My car was throwing 51 and I took mine off and the tps spring was rusted up pretty bad. I had to spray it with wd 40 and keep working the spring until if freed up, of course it was not the Q45 like your dealing with. Your switch maybe is rusted up. You might keep working with it and free it up. Good luck.

 

[whitemike]

It sounds like it is doomed. My car was throwing 51 and I took mine off and the tps spring was rusted up pretty bad. I had to spray it with wd 40 and keep working the spring until if freed up, of course it was not the Q45 like your dealing with. Your switch maybe is rusted up. You might keep working with it and free it up. Good luck.

Perhaps. This whole thing is enclosed, I may try to pry it open as a last resort.

 

[89supracrazy]

Yeah. I have had no dealing with the Q45 but where the tps hooks onto the throttle body, I would work the shit out of it. I am talking about when you get it off the throttle body. Turn all the way one way and let it fly back in the rest position. Keep doing that and maybe it will work for you to free up the switch.

 

[jetjock]

Someone is confused. 51 is caused by a *lack* of continuity between IDL and E2. If IDL and E2 are always connected together (IDL is always low) there can't be a 51. At least not one that's TPS related. Nor would the engine rev above 1500 rpm...

 

[89supracrazy]

We might be on the wrong track. I was taking for granted that the code appeared after installing the tps. Maybe we will know shortly.

 

[jetjock]

He should:

1) Put the system in diag mode.

2) Unplug the TPS. There should be a 51.

3) Short IDL and E2 on the connector. 51 should clear.

4) If it doesn't leave IDL and E2 shorted then start the engine and open the throttle. If the engine refuses to rev above 2000 rpm the wiring is good.

5) If all the above occurs the IDL contact in the TPS is *open* all the time, something is wired wrong, or the code is unrelated to it.

 

[whitemike]

Thanks JJ, that's the kind of post I was looking for. Will reply back with results. I can't think straight right now, working all day, packing all day, and car trouble and my girl is like "whennn do i get to seee youuuu wtfff".. I just wanna rip my hair out.

thanks again,
mike

---------- Post added at 08:43 PM ---------- Previous post was at 08:35 PM ----------

41 replaces 51 when IDL and E2 are shorted, I assume that's to be expected as the TPS isn't plugged in. So this means the wiring is good.

Messing with the TPS more I see extremely inaccurate readings. I know It's screwed up. Sometimes I flick the TB open and it returns with continuity, then do it again and nothing. Am i wrong in thinking it needs replacement?

 

[whitemike]

Yea, It's fucked.

 

[89supracrazy]

When it rains it pours.

 

[jetjock]

41 is normal with VTA floating eg; when the TPS is unplugged. It's because with the TPS disconnected VTA will rise to 5 volts. That puts it above the 4.8 volt limit the diag system uses to judge it as being connected.

If your idle contact isn't closing either the throttle linkage is restricting it or the contact is NFG. My main point though was you can't have a TPS related 51 with continuity between IDL and E2 (as you proved by shorting them). 51 only happens when IDL and E2 are open.

 

[whitemike]

Turns out the constant continuity *wasn't* occurring on the car. This thing is so fucked that when I tighten/loosen the screws the resistance and voltage goes up and down. So, when tightened = no continuity and that's what the 51 was about. Taking it off the car (no screws) and testing yielded a perfect connection. Go figure. I don't know why I was thinking that 51 was caused when IDL and E2 shorted.. meh.

So, I popped it open and found that the rotor inside is being pushed away from all the contacts once the rod from the TB is pressed into it, the tighter it's screwed in = further away from the contacts. This looks to be due to the area the rod 'clips' into being extremely worn/cracked so It's not securing properly to the TPS's housing.

Balls.

mike



Edit: Thanks for the help JJ. I knew you'd chime in if the subject involved a TPS or a volt meter