Extreme oil temps after ecu reset

Jordo! · 07-29-2010, 11:08 PM

Hmm. Funny enough, I thought mine looked temporarily high after the dealer reflashed the ECU's headlight autotimer setting... could be a weird software glitch where anytime the ECU is calibrated/reset the sensor misreads things until the next key cycle.

Or... maybe it recalbrates itself if you reset the ecu, leading to a potential inital misread.

If it doesn't happen again, I'd chalk it up to goofy software issue and not worry about it.

370Zsteve · 07-29-2010, 11:26 PM

Disconnect the negative terminal on your battery for 10 minutes. Then you'll be sure the ECU has cleared completely with no odd issues.

Modshack · 07-30-2010, 08:11 AM

Quote:

Originally Posted by 370Zsteve

Disconnect the negative terminal on your battery for 10 minutes. Then you'll be sure the ECU has cleared completely with no odd issues.

Best way to reset, but all a reset really does is Zero out the fuel trims and reboot the computer. Fault codes remain and don't completely disappear unless cleared with an OBD tool...though the CEL may go out.

GZ3 · 07-30-2010, 08:19 AM

thanks for the replies everyone. The oil temps seem to have leveled off again to 210-215. I even drove a little hard, extended my route and the temps wouldnt budge. I'm gonna reset the ecu again on sunday and go for a drive, if the oil temps soar again, then i might be convinced that some of the oil temp issues could be ECU related. I'll report back!

Jordo! · 07-30-2010, 05:07 PM

Quote:

Originally Posted by Modshack

Best way to reset, but all a reset really does is Zero out the fuel trims and reboot the computer. Fault codes remain and don't completely disappear unless cleared with an OBD tool...though the CEL may go out.

Really? Does that mean if there's multiple trip detection logic it will throw a CEL again soon?

Quote:

Originally Posted by GZ3

thanks for the replies everyone. The oil temps seem to have leveled off again to 210-215. I even drove a little hard, extended my route and the temps wouldnt budge. I'm gonna reset the ecu again on sunday and go for a drive, if the oil temps soar again, then i might be convinced that some of the oil temp issues could be ECU related. I'll report back!

Let us know. I bet it has to recalibrate itself. Some ECU's after a reset cause temporary hunting at idle for similar reasons.

Modshack · 07-30-2010, 06:22 PM

Quote:

Originally Posted by Jordo!

Really? Does that mean if there's multiple trip detection logic it will throw a CEL again soon?

Let us know. I bet it has to recalibrate itself. Some ECU's after a reset cause temporary hunting at idle for similar reasons.

Yeah...faults are stored in Non-volatile memory. Unless the cause of the fault is corrected it will likely come back.

Fuel trims will re-calibrate naturally...It usually takes from 25-50 miles for the Long term trims to re-set. You have constant correction of the short term trims though which eventually build a table for the long term numbers to be set

07-29-2010, 11:08 PM	#1 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Hmm. Funny enough, I thought mine looked temporarily high after the dealer reflashed the ECU's headlight autotimer setting... could be a weird software glitch where anytime the ECU is calibrated/reset the sensor misreads things until the next key cycle. Or... maybe it recalbrates itself if you reset the ecu, leading to a potential inital misread. If it doesn't happen again, I'd chalk it up to goofy software issue and not worry about it. __________________ Enjoy it. Destroy it.

07-29-2010, 11:26 PM	#2 (permalink)
370Zsteve A True Z Fanatic Join Date: Sep 2009 Location: Gold Coast CT Posts: 10,599 Drives: 2019 Corvette G.S. Rep Power: 43	Disconnect the negative terminal on your battery for 10 minutes. Then you'll be sure the ECU has cleared completely with no odd issues. __________________ SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS.

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07-30-2010, 08:19 AM	#4 (permalink)
GZ3 A True Z Fanatic Join Date: Dec 2009 Location: SATX Posts: 3,296 Drives: Z Rep Power: 22	thanks for the replies everyone. The oil temps seem to have leveled off again to 210-215. I even drove a little hard, extended my route and the temps wouldnt budge. I'm gonna reset the ecu again on sunday and go for a drive, if the oil temps soar again, then i might be convinced that some of the oil temp issues could be ECU related. I'll report back!