2G Coolant temperature sensor -40°

[accidentaldsmer]

Ok I am putting the finishing touches on my 6 bolt swap and am finally at the logging stage so I noticed my coolant temp sensor is stuck at -40°. I figured easy fix so I swapped in a brand new one but no luck the code keeps coming on and it continues to stay @ -40° which i think is making my car act really funny: timing is extremely erratic and I can't put a load on it because it immediately retards my timing and smells supper rich. Any Idea why a new sensor fixed nothing?? Is there something else I should check??

 

[Chicken Patty]

Ok I am putting the finishing touches on my 6 bolt swap and am finally at the logging stage so I noticed my coolant temp sensor is stuck at -40°. I figured easy fix so I swapped in a brand new one but no luck the code keeps coming on and it continues to stay @ -40° which i think is making my car act really funny: timing is extremely erratic and I can't put a load on it because it immediately retards my timing and smells supper rich. Any Idea why a new sensor fixed nothing?? Is there something else I should check??

The wiring? I had bad wiring on a previous DSM, it was cut somewhere unless the harness.

 

[turbosax2]

blownsensorground [ECMTuning - wiki]

 

[Chicken Patty]

blownsensorground [ECMTuning - wiki]

Good find, I had never heard of this, usually resulted in just wiring or the sensor itself. Good to know, thanks.

 

[accidentaldsmer]

Thanks for the replies, I will be checking both things asap.

Ok I opened up the ecu and couldn't find any sort of ground on pin 92 so i'm guessing that is my problem.
but now I can't find where to soder a ground too...

here is a picture of it i took

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I started a new thread since this seems to be going in a new direction but now i'm second guessing myself and maybe I should leave it continous.

 

[wolski420a]

make sure its plug in mine was part way unplugged and it logged at -40

 

[accidentaldsmer]

make sure its plug in mine was part way unplugged and it logged at -40

Yup it's plugged in... I would of kicked myself if it wasn't but I would of been so relieved too. I already have my ecu out but I haven't been able to find exactly where to soder for the ecu ground

 

[Lofty]

Sensor ground is pin 92 on a 2G DSM ECU and pins 17 and 24 on a 1G DSM ECU.

There's not a specific place for you to soder it, you need to find where it burned through.


The easier way is to fix the o2 sensor problem and get a new ECU so you don't blow it again.

 

[steve]

I don't see a blown sensor ground in that picture.

Like I said in the other thread, measure the ECT sensor resistance at the sensor and at the ECU connectors.

When the sensor ground blows you loose the ECT, TPS, O2, Baro, and IAT sensors.