TPS in ECU Display screen

[TR.]

Hi,

This one should be nice and easy for you folks... hopefully!

To preface this:

Verified channel assignment both in the software and physically at the ECU and TPS connectors.

Checked continuity between the ECU connector and TPS connector, for correct Analogue In, +5v and GND.

I do have a ground and a +5v reference voltage at the TPS connector when checking with a DMM, so all three seem to be correct end to end assignment wise and physically.

At this point, I bench tested the TPS, and it works as expected.

The IAT and ECT are reading as expected (ignition on, engine off) on the laptop's ECU Display screen, but the throttle position does not change and attempting to calibrate it yields no result either. 

This is a billy basic Hitachi 3-Wire cable throttle, so I'm a little stumped sorry. Is there some funny setting like it needs to be running to display this? (seems very unlikely, but I have to ask, as I've checked the sensor and wiring).

Thanks for any advice as always guys.

*edit, I do have a couple of fault codes from a pair of pressure sensors not being present and fitted yet.

[Brad Burnett]

Sounds like the pinout at the tps connector is wrong.

If you look in the Analogue Voltages tab in the runtime value list(F12 or r), do you have any voltage on the ANVolt channel the tps is connected to?

[TR.]

Thank you for the reply, I appreciate it.

It is definitely 'right' for the factory diagram, however it strikes me now perhaps I need to change it for the Link application?

As standard 1 is Sensor Ground, 2 is Signal and 3 is +5v. I will switch 2 and 3 a minute.

I will check runtime values now.

[Confused]

Are you sure you haven't reversed the pinout - some diagrams specify it looking into the harness connector, some specify it looking into the sensor itself.

[TR.]

Good call, I did double check as I have done exactly that with similar, but different, connectors in the past, but I don't believe so here... may be wrong however.

It is reading and displaying in the Analog input section of the Runtime Values, a touch over 0v closed to around 4.7v at WOT, I have just checked now, so as expected in that section there.

I did reverse the wires, despite the above, and it didn't make any difference to the actual display 'issue' and when swapping +5v and signal around it left it not doing anything.

[Adamw]

TPS can work either way around - voltage rising or falling with opening.  If moving voltage is showing on the analog input raw voltage but the TPS runtime is not moving then there is something wrong with your software setup.  Can you attach your tune and a short PC log of a couple of pedal movements.  

[TR.]

Hi Adam,

Thanks for the reply, that was what I expected and was the only reason I questioned the software, as any I've wired in reverse by mistake before have just read high>low instead of low>high.

Weirdly, although it did read in runtime values, I made a quick ghetto patch loom from the TPS connector to an external alternate TPS (some old VW Bosch unit) and it read perfectly fine and calibrated just fine in both the main screen and runtime values. Plug back into the original sensor, no calibration, runtime values only, but still tests somewhat ok on the bench, must just be on its way out but not completely dead yet? Very odd.

I spoke to Anthony via Link Email (good dude, thank you!) and he said these odd things can happen and maybe the sensor is just packing in given that the alternate sensor worked.

Thanks for everyone's replies, had me confused this one.