Jefrey

I have a wrx MY95, its been running fine up until today i fired it up this aftrenoon & after 10 seconds the Cooling fan starts!!! it seems to turn on & off after 15 seconds approx.

I've looked inside the dash and the 'Check Engine' light is also on?

Help & advise please folks, Many Thanks

Delboy2

If you have a CEL - look HERE for instructions how to read the cause of the CEL

Cheers

Jefrey

Btw the engine is totally standard, cats are still on.

RussBoy

I've had this.

With me it was caused when my car started running a bit lumpy in traffic (Type R with mods). I had heard from an ex Subaru mechanic that there had been quite a few problems with the idle control valve getting dirty on Scoobs and Legacys and then confusing the ECU so I just adjusted the ICV very slightly.

Since having done that the car ticks over a bit better (albeit with a little loss of power at top end) and I occasionally get the warning pop up but normally after I've driven like a nutter or contrarily, driven like a monk. In my case it has something to do with the O2 sensor and mapping but having now run a new octane booster (NF) for a month the sensor hasn't come on (though this could also be a co-incidence or something to do with cooler weather...).

I'm told (and it seems to be the case) that if you start and turn off the engine 3 times in a row this can clear it and also (again with me) coasting to a really slow stop and a pause at a junction also clears it, at least temporarily.

However, like I say, this was just my problem so I'd get it checked. Bet you it's the ICV or dodgy O2 sensor though....


R

Jefrey

Ok i've done this Dianostic check, & its showing 3 faults!!

1) Fault 21 = engine coolant temp. sensor

2) Fault 22 = knock sensor

3) Fault 31 = throttle position sensor

Ok so with the fans going on & off constantly i can understand fault 21, but the other two??!!, whats going on?

bluep

disconnect battery for about an hour and it will reset,done this many times with my old wrx.

Jefrey

Will the 'engine check' light dissapear?, what about the rad fans?,

bluep

Should do if it is like mine.Fans come on cause the car thinks it is over heating-its the sensor for coolant.Try my method and if it doesnt cure it replace c.sensor.Bet you car is a pig to start when cold?

Jefrey

Right i shall try that.....

yeah it is a bit rattley when cold starts.

Cheers (fingers crossed)

Rally

Hi, I have 95 WRX.

I was getting this, turn on ignition, rad fans start and car drives with them on all time, this then progressed to turn ignition on rad fans start and car just turns over and wont start.

I reset ECU after each episode of this and the car then started as normal, but with in 2 or 3 more time of starting the rad fans were on constantly again.

I was getting code for coolant temp sensor also, so bought a new one from main dealer, only about £25, problem totally cured.

Don't waste time disconnecting battery, just join the reset connectors under dash and reset ECU in method contained in the link in second post in this thread, job done in 5 mins. I had to reset mine in pub car parks, laybys, public car parks and even just on road side both in daylight and at night with keyring torch, trust me it is a piece of pi55.

The other 2 codes are there stored from the last time the ECU was reset, could be years ago and may be result of nothing to worry about. After this reset again look at any stored codes in a few weeks to see if they have come back.