P0115 Engine coolant temp (1) - Alfa Romeo Forum
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(Post Link) post #1 of 2 Old 21-07-12 Thread Starter
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Join Date: Jul 2012
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P0115 Engine coolant temp (1)

Hi there,
I've been reading around some posts and I am a bit confused.
After reading P0115 with FiatECUScan, I checked the coolant temperature sensor located in the thermostat (removed and double checked with termometer and same value given in ECU) + cable is correct to ECU. Is there another sensor that reads the temperature called "water temperature sensor", described in the workshop manual ECU, connector C, pin 49?

Sympthoms are: Black smoke + temperature gauge reading is correct.

Or am I totally looking in the wrong direction?


Car: 146 JTD '99
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(Post Link) post #2 of 2 Old 05-08-12 Thread Starter
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Join Date: Jul 2012
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County: Alicante
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thermostat. Gauge temperature low

After reading and investigating, I realised that the temperature gauge never went over 70ēC when driving in motorway and went up stuck in a traffic jam. Therefore, my thermostat was always open and never reached 90ēC.

So, I bought a thermostat (100Eur-Valeo), removed the temperature sensor from the existing stat because the one that came with the new stat did´nt work correctly.

And after 2 hours of work the result was successful!!!! Now my alfa runs better, gets to 90ēC in 3 minutes.

I would like to point out the following that helped me from other threads:

- Changed original Alfa clic hose clips for jubilee clips.
- Removed the battery as specified in the workshop manual which eased the work.

I am happy, as this was my first job in the car and will keep on doing Glow plug replacement!
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coolant , engine , p0115 , temp

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