Okay trying to solve my no start issue.

My coolant sensor did not have any resistance when I tested it on the car and then the plastic connector on the sensor just broke off. The pins were all corroded. I am thinking that it was dead. I am picking up a new one later today.

While I was in there I turned the car to the ON position and tested the signal from the ECU on the connector. I got some interesting readings. First off was the power line showed me 9.02v I thought this was supposed to be 12V.

The other issue was that when I swapped the probes it showed me -9.02 volts. I thought it would show 0.00 since the power probe was on the negative line.

Third, without the coolant sensor working on startup does it go into a "fuel dump" mode? You can clearly smell the fuel after trying to crank and crank.

Thanks for the input.

 

Fuel pump has a relay that controls the voltage, its 9 normally, and 12 under heavy throttle. Also, with no coolant temp reading, the ECU will dump lots of fuel in via the cold start injector.

 

Hm maybe these coolant sensor links can help a bit:

https://www.clublexus.com/forums/per...?highlight=diy

https://www.clublexus.com/forums/per...placement.html