I own a 1999 Subaru Forester 2.0 S Turbo - Petrol / LPG. The Coolant Temperature Sensor died several months ago. As a result, from a cold start the engine won't maintain tick-over; it stalls.  This occurs whether the car is stationary or in motion. To be specific, the engine can stall when I slow down to turn a corner, at traffic lights, etc.

A mechanic I've used for several years now ( a real petrol-head) has tried to identify the Coolant Temperature Sensor, but hasn't had any joy so far.  Because he hasn't worked on many Subaru's, he recommended I come on here and ask you guys for help... He suggested I ask, "Where is the Coolant Sensor for the Engine Management Centre located?  Is it underneath the Alternator?  If it is, then he has located the right one.  

N.B. The sensor is a 3-PIN not a 2-PIN.  Whilst he had the sensor out I made a note of the markings on the sensor: GMA AA16 NTCL.  There are no other markings on the sensor.  I will attach some photos of the sensor and my Subaru.

 

I have contacted Hants Auto Fuels Limited (Unit 5/6 Hammond Industrial Park, Stubbington Lane, Fareham, Hants.) who installed the BRC LPG system in 2005.  To cut a long story short, they said the BRC LPG system can only be worked on / serviced by an licenced BRC LPG engineer.  And I would have to take the Subaru into one of their authorised garages / units to investigate which sensor it is and how the system is set up, etc... I related this to my mechanic and he reckons this is B.S.!

 

(According to the LPG Installation Certificate the equipment was supplied Alternatech.  The Regulator Make is a Prins VSi.  Make of LPG Tank is a Stako and is a 55LR Totoidal situated in the spare wheel well located under the boot.)

 

Can anyone offer any help, suggestions, advice or information, please?

 

Many thanks in advance.

 

That indeed the ECU coolant sensor

ICP do them & quite a few other sources too:

* worth checking with them to confirm part via reg-chissis-engine number prior to buying *

http://www.importcarparts.co.uk/parts_info.asp?id=4279&cat=0⊂=0&sec=0&var=0&dc=&gen=

 

http://www.ebay.co.uk/itm/Forester-2-0-2-5-Turbo-NA-98-07-ECU-Water-Coolant-Temp-Temperature-Sensor-/271365238379?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3AForester|Cars+Year%3A1999&hash=item3f2ea0ee6b

 

Ideally want test sensor impedance over varying temp & see if it seems working/in parameters.

Does plug-cable seem good. Bit of testing here good although sensor not over expensive if want chance it.

Plenty of other things it could be & plugging in  some diagnostics would be good to read faults & see what tenp signal the ECU getting if not flagging it faulty.

Hi Mr B,

The information you've provided is excellent! I'm most grateful to you!

Many thanks,

Nigel.