stuartknox

Hi all

on my way to work last night i goit the following code


P1093 -- Tumble generator valve #2 (LH) malfunction (stuck close)

car is a 2003 wrx

car seems to have went into limp mode as only boosts to 0.5 bar now, does anyone know what the above code means and more importantly how to fix it?

Cheers all.

PeeVee

iTrader: (1)

Stuart,

Where the inlet manifold bolts to the cyl heads, there is a sandwich plate in between the two items. Contained within each of these are a spindle & 2 butterfly valves (1 valve per cyl).... your code is telling you that the LH (ie passenger side) butterfly's are stuck in the shut position.

The trick is going to be trying to find out the reason for the fault:

1: It could be a wiring fault, but this is highly unlikely, as Subaru's don't generally suffer from such problems unless someone has tampered with the factory wiring at some point... Also, there are codes available to the ecu for such failures.

2: They could just be stuck, due to carbon or general grime.

3: The potentiometer, bolted to the front of the Tumble Valve assay (facing the radiator) has failed and is giving a permanent "valve closed" signal.

Phil

stuartknox

cheers for the reply

its funny now i cleared the code and it came back on, this time stating

p1092 which is the valve stuck open, so i think it maybe the second option a build up of grime and crap making it stick. So i think its going to have to go in for a little tlc.

stu

PeeVee

iTrader: (1)

Are you mechanicaly minded and patient? as you maybe able to fix it yourself with a bit of guidence to avoid a new unit.

stuartknox

hi again

took the tumble valve solinoid off today and think it may be this as the valve was easy to turn by hand and sprung back without sticking when the solinoid was removed. Is there any way of checking if the solinoid is faulty, would connecting the 2 green plugs in diagnostic mode make the solinoid open and shut?

cheers for your help

im not too bad mechanically so maybe...

stuartknox

or it could be as you earlier stated a faulty valve sensor at the front giving a permanent open/shut signal

cheers

PeeVee

iTrader: (1)

I have never tried connecting the 2 green connectors to see if it cycles the valves, but you could try.

Have you still got the tumble solonoid removed? if so, you could plug it in & watch the motor drive whilst someone turns on the ign. at this point I believe the ECU will spend a couple of seconds trying to set the tumble valves to a preset position so you should see the motor turn... unless of course it's looking for a closed signal in which case you could manually turn the tumble valves to half open & try switching IGN on again.

If you get no movement of the motor, then it is knackered... If the motor does move then the sensor is your problem.

There is always an outside chance of course that the valves WERE stuck & you have now disturbed them and corrected the fault without knowing.

stuartknox

hi cheers for the info again

i will try again on friday, the cel code reappeared after i reset it so the problem is still there. So i will try again, i would have turned over today but had to take intercooler off to get to it so couldnt turn ign over to test

cheers

PeeVee

iTrader: (1)

You don't have to turn the the engine over, just turn the key to position II so that the ign lights are on. You can do this with the intercooler removed from the vehicle.

stuartknox

sorted now, took sensor off front, turned ign on and you could see the rod turn so it was not the solenoid. However i noticed that the sensor was in the wrong position when turned off and did not allow the internals of the sensor to move when the ign was turned on, so i left the ign turned on then refitted the sensor in this postion.

Reset cel code and no more cel light, sorted, so as you stated i must have freed the valvle off the other day when i removed the solenoid and i now remember when i first checked front sensor it sprung when i removed it so i refitted it in wrong postion the other day.

Got there in the end and cheers for your help.

stu

PeeVee

iTrader: (1)

Well done that man.

It's always satisfying to fix something yourself & avoid those garage bills!

Phil