v70 2001 ETM problem

bollin · Post by **bollin** » 20 Jun 2018, 00:43

I have an issue with my ETM. It started as an iterremittent problem with surging and rough running from time to time. I started suspecting the ETM since it was white label Magneti Marelli, but I could not find fault codes with VIDA at the time. I ordered both MAF sensor and sacer TPS.
I did at some point get a fault code pointing to the ETM, so I replaced TPS sensor to sacer. The car ran very badly, so I opened up the ETM again and calibrated voltage by turning the magnet. I got 1.296 from pin 2 at the other sensor, so i adjusted to within 10 mV and reassembled. The car ran as it should for 10-15 minutes and then started throwing fault codes (many
CAN-bus connection errors to ABS, TCM, ETM) and always TPS sensor 1 faulty signal (ETM/ECM?-9150)
So I figured there must be a loose connection or something so I took it apart once again, checked everything and adjusted voltage within 5 mV, tested it good, reassembled and reinstalled. The car ran great for a total of an hour, and then the same ETM-9150 fault code pops out.
Did an ETM test, first it showed 0.37 degrees difference, but I ran it again straight after and then it reported 76.04 degrees difference.
So, definately something wrong. Bad board perhaps? or could I have a bad sacer TPS? Magnet?

Post by **RickHaleParker** » 20 Jun 2018, 14:44

Did you check the wiring to the ETM? Low voltage feed to throttle module (loose/dirty connections) and poor ground (loose/dirty connections) to electronic throttle module can produce ECM-9150.

They use a lot of road salt up your way. I would look over the entire wiring for corrosion.

bollin · Post by **bollin** » 20 Jun 2018, 15:45

Well, today I fitted the salvaged ETM and it runs very well so the problem is with the original ETM.
Since it only gives ECM-9150 which is sensor 1 and motor end of throttle body. I believe that there is something funny going on with the black lead, like a loose connection or something. Btw, shouldn't the black lead be potted in the sacer to protect it from vibrations etc as well?
I removed the original tps before I could measure voltages, should I match MM pin 2 (to which the black lead is to be connected) to sacer pin 3 or black lead? There is a slight difference in voltage...
Another thing I noticed is that the epoxy was no longer clear, but more amber to its color after second and third disassembly. I'm using loctite power epoxy universal 5 minute, according to spec it should be ok.