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[Owen]

So where abouts is this? Have read a few posts referring to dodgy connections on the tps, would like to check mine to cross it off me list of suspects, but don’t have a clue (per usual) where it is then?

[TheBoy]

rhs of throttle body....

[amba]

Small black box secured by 2 screws on the right hand side of the throttle body as viewed from the front of car..has a rubber plug connecter held on by clip tabs with 3 wires going into it and the exit cable goes into the cable tray which runs along the right side of plenum chamber....had issues with mine and it turned out to be a chaffed wire shorting out on bracket for air con pipe..this was causing erratic running and idle...worth checking the plug connecter as beleive they start to corrode and wires become brittle and don,t give good connection.....if you read previous posts i made on this you can do a voltage check across the connecters to ensure all is well

[Owen]

Small black box secured by 2 screws on the right hand side of the throttle body as viewed from the front of car..has a rubber plug connecter held on by clip tabs with 3 wires going into it and the exit cable goes into the cable tray which runs along the right side of plenum chamber....had issues with mine and it turned out to be a chaffed wire shorting out on bracket for air con pipe..this was causing erratic running and idle...worth checking the plug connecter as beleive they start to corrode and wires become brittle and don,t give good connection.....if you read previous posts i made on this you can do a voltage check across the connecters to ensure all is well

Well i read at least 50 pages of 'General Help' last nite looking for problems that relate to my motor, and gonna start with going through the electrical connections saying as me dash is lighting up like an xmas tree!

[Owen]

Well code 21's comming up. Will check in the morning, but is there a common answer for this one?

[TheBoy]

Sensor, wiring, or ECU.  Does that narrow it down?

Seriously, the sensors are normally reasonably reliable, but if you're getting a code, and can't find a wiring issue, try another sensor. They are generally reliable enough that a 2nf hand one should be OK...

[Owen]

Gotch, again will have a go in the mornirng and post me results

[Abiton]

Dunno whether it's the same as the one on a x20xev?

I hacked into mine to see whether it was causing my troubles a couple of months back.  Was surprised how nicely engineered it was internally.  If it is the same type, I could do resistance measurements on mine, but I suspect that as long as you get a smooth change of resistance with rotation of the spindle, the absolute ohm values are uncritical (pretty sure it's used as a potential divider, so just returns a proportion of the input voltage). An analogue ohmmeter would be ideal for checking this but...

...my bet would be a connection/wiring problem to it, not the TPS itself.

I bought a cheap secondhand one (before I'd got inside mine) which proved to be identically good. As The Boy says above.

Edit: FWIW, just measured the one I hacked into, it's a Bosch 0 280 122 001.  It seems to be a total of 2160 ohms between terminals 1 and 2 (unvarying with shaft angle). If you measure between terminals 1 & 3, or 2 & 3 you see a range of 928 ohms to 2860 ohms as you turn the part the spindle goes into. Obviously it varies the opposite way depending whether you're between 1 & 3 or 2 & 3.

I guess there must be a 'padding' resistor (~220 ohms) at either end of the track, and (a 700 ohm) one between the wiper and the o/p terminal, to explain these numbers, vaguely remember seeing such things but I glued the lid back down, so can't see any more!

[Owen]

Well as advised have just taken a look at the wireing cleaned the sensor connections, and the code 21 has left the building!
Only got me code 89 to deal with now