I need a table of voltages with associated temperatures for the stock coolant temperature sensor.

Does anyone have access to this information, have the electrical version of the Helm's manual (which might provide this information), or know how I might get it?

With thanks,
CB

 

CB, all I could find in the electronic version was that it should read between 0.1 and 4.8V ....... yeah hey, thanks a lot!!!!!!!!

 

... one other piece of almost useless info that was given in the system description is the resistance of the sensor goes down as the coolant temp rises.

Did you guys try to compare the OBD2 ECT reading w/ whatever (AEM?) is giving you the suspect readings?

 

Thanks, RT. You're the man (now move to Portland!). Great idea to compare the OBD-II ECT readings with the AEM readings. Now, I just need to find someone who still has data streaming to that port who's willing to probe their wiring harness with a multimeter... I suspect that I may wind up buying a temporary gauge, but I was hoping for an easier solution.

The EMS is indicating that my car's running hot -- 222 degrees F -- when there seems to be no reason for believing it. I've got the Mugen cooling mods and have never hit four bars, even on the track when running full boost. The thermostat isn't wired into the EMS, and the fans can't make that much of a difference at highway speeds, so I can't imagine that the car's actually running any hotter than it was before.

CB

 

Chris, gimme a call about this.. it happened to me with my AEM but only because we had the PW2 pin used for the boost controller. AEM mentioned that something else might be the issue though.. Drop me a PM if you don't have my cell number (starts with 813-731).

Chris

 

I monitored my coolant temps via OBD-II at the track a few weeks ago. I was staying around 200 deg F with all the Mugen cooling mods. I'm not even boosted.

 

Gernby, that's well within tolerance (176-212 degrees F), although still hotter than I would have expected. I've never hit four bars, even under boost on the track, so I've no reason to believe my car was actually running hot. Moreover, Giles (GilbertG)'s car was running at 212, right at the upper limit of the acceptable range. That's why we're guessing it's a problem with the AEM calibration of the sensor voltages. If anyone's got an OBD-II datalogger and a multimeter, it would be great to know what the voltage equivalents are...