TPS works when in neutral but not when in gear.

[antus]

Writing a good bin should clear the code 51 memcal error. Then you can trust the system, and if you have other codes they are real. We're not saying that'll fix all the codes. You just want to check memcal error is gone, then you can tick that problem off the list.

[Asho88]

It’s fixed I moved the earth to a better spot and all the codes cleared except the TPS code so I’ll replace the TPS and see what happens.

[Charlescrown]

The TPS is easily viewed with TunerPro. 1 volt closed 5 volt WOT approx. That tells you the TPS, wiring and ECU are all working.

[antus]

Except his TPS didn't clear, so there must be an electrical fault in the sensor or the wiring, or unlikely but not impossible the ecm. Logging TPS voltage rather than position will show if there is low signal, or none.

[Asho88]

I will look into it further when I get a spare moment. At this point it gives me no reading on the dash position aka percentage reading with the ignition switched on but reads with engine running in park. I checked the power it’s getting 5v with ignition on waiting on a new sensor to try that. It is a second hand sensor I got with the manifold so could well be stuffed. Cheers

[delcowizzid]

The earth's need to goto the engine block

[Asho88]

Ok so finally had a bit of time and was curious popped the sensor off and realised when I swapped it out I fitted it incorrectly it wasn’t spring loaded so now that’s working. Thanks for all your help! As for the earth I’ll buy a joiner thing and fit it to the block or I’ll attach it to the back of the head.

[Asho88]

So for anyone having this issue in the future I thought I’d sorted it as I was getting a reading whilst running etc still had the low volts code so I persisted tried a new sensor messed around and searched I found that I was getting 0v at closed throttle turns out it’s supposed to read 0.5v. Now to the next issue the sensor is meant to go straight on with out a hitch it wasn’t grabbing up (I discovered in my researching that some throttles ran a little adapter inside the tps so it actually grabs up) mine didn’t have this nor had I seen it (could’ve been stuck in my very original sensor which I swapped out cause the casing was broken. Anyway I’m not sure if you can get the little adaptor so I ended up flattening a bit of alloy fuel tube and slide it over the throttle side and squashed it to fit in the sensor. Works spot on now bit dodgy but works I’ll keep an eye out for the adaptor.

[vlad01]

Ahh the old plastic cap trap! I fell for that one a few times, they just fly off the shaft often when you remove the TPS since there is are washers and a spring behind them, that just launches that cap off the shaft one the TPS is removed, often lost under the car.

And boy does the car drive like shit when that cap falls off.


Interestingly, the very early 88-89 manufactured throttles used a fatter and different shaft that was the full size, and they did not run a plastic adapter cap. Those early ones ran the shaft directly in the casting and often wore out, the latter thinner shafts ran in sealed needle roller bearings which were much better, but required that cap that you lost.

[Asho88]

Well interestingly I have two throttles one VN (I believe ) and one VQ also two different tps’s so I dunno it’s working now that’s the main thing lol