S52 swap TPS woes.

[drez14]

Hey guys,

still sorting out gremlins with my swap. I was getting a 1216 code which indicates TPU sensor so i removed the old one and tested it with a multimeter. What i found was a break in signal around 2k OHM. I bought a new sensor from pelican, before installing it i test it. Whaddaya know, this one has a break in the signal just like the original. I thought to myself, bad luck, i called pelican and they ship out another one. I got that part in today and same thing. Can anyone else tell me if this is normal or do i just have the worst luck.

Here is a video of me testing the sensor. The bentley says that acceptable reading are between about 1k-. Mine are from about 1.5 to 4.8. with a break in signal

http://www.youtube.com/watch?v=V52IyJkHpSk

[328ijunkie]

I think youre moving it to fast for your multimeter or sometrhing. Thats weird

[bimmerteck]

Take your DMM off auto range if possible, what your seeing is it briefly dropping reading as it changed ranges. I've seen this with numerous cheap meters. ;)

All DMMs are not created equal, and there's a reason pros pay out big bucks for quality test equipment.

[bimmerteck]

BTW- Is the connector in your video what you've been using for your TPS? B/C that connector is usually the ISV.

The TPS's connector from the harness should have a

pin #1(typically brown)Ground- DME pin #44 / Ground for engine sensors
pin #2(typically Brown/Black stripe) DME pin #73 / TPS signal input
pin #3(almost always red with a yellow stripe) DME pin #59 / 5v supply

[drez14]

Thanks for the info. Yah.

bimmerteck Thanks for the insight. I was thinking that is was a multimeter thing because having 3 bad sensors in a row would be just too unlucky, even for me. Regarding the connectors, i just cut off any old 3 pin connector off my old m20 harness to use on my test bench. the wires on my actual engine

So if its not the sensor what could it be? how does the DME use the sensor data? Does it assume that the sensor is manufactured to read from a-b range, or does it "learn" the range of the installed sensor? The reason i ask is because at idle, my reading is is about .5 above what the bentley says, and at WOT, it is about .8 over. Maybe my set screws are screwed up? Can anyone verify their tps values?

I just cant figure out what is going on with my swap. The only code left is the 1216, and i have to get it taken care of to pass smog. and i realize that i get a loss of power at around 5-5.5k, which from what i have read is a result of this.

I have checked the harness for any errors.. The only other thing that it could be would be the DME.. whats the likeliness of that?

[bimmerteck]

I have checked the harness for any errors.. The only other thing that it could be would be the DME.. whats the likeliness of that?

If I had verified all 3 pins of the wiring and tried multiple sensors I'd probably open the DME and inspect it for water damage.


It's a relatively common occurrence on e36s