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Old 10-31-2003, 01:06 PM   #1
lupohki
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Member#: 3457
Join Date: Jan 2001
Chapter/Region: MAIC
Location: Herndon, VA
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2008 STi
DGM

Exclamation Help ... CEL 1086 re: Tumble Generator Valve - SOLVED

I was installing a grounding kit and to reach one of the bolts I removed the Tumble generator valve ASSY (didn't know what it was at the time) without disconnecting the battery as outlined in the service manual:

service manual

After reconnecting it and starting up, I had a CEL and the blinking cruise light. I went to Autozone and they pulled a 1086 code which is:

Tumble Generated Valve Position Sensor 2 Circuit Low

There isn't anything complicated in detaching and reattaching the piece. It's just 2 bolts on the housing and then there's a tab that goes into what looks like a spinning wheel on the other end. Did I fry it?

Driving-wise, throttle sound is different and response is noticeably weaker.

Any ideas before I take it to the dealership?

Here's a pic of it:



edit: updated proper naming of diff pieces based on service manual

SOLUTION: I needed to wind up the spring before reattaching the assembly by inserting the plug end in the 12 o'clock position and then twisting it to the 3 o'clock postion where it lines up with the bolt holes.
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Last edited by lupohki; 10-31-2003 at 03:09 PM.
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Old 10-31-2003, 01:18 PM   #2
dsmperformance
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Clear the code and see if you get it again.
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Old 10-31-2003, 01:19 PM   #3
lupohki
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I tried clearing the code via disconnecting the battery and also the autozone guy tried clearing it via the machine, and it doesn't go away.
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Old 10-31-2003, 05:44 PM   #4
Amazake
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just did the same thing on my O2 unfortunately i cracked mine
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Old 11-01-2003, 11:48 PM   #5
cann
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hey i can help

u take out the thing
u see inside it's like > <
if u use a screwdriver, it turns
and u see on the car there is a ---

so u need to put that thing on the --- turn it a bit, and bolt the two screws

idea is
> < at 0 degree = low
> < at 45 degree = car works fine
> < at 90 degrees = high

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Old 11-02-2003, 06:04 PM   #6
Invisiguard
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did you pump the brake pedal a few times after you disconected the battery to reset? thats supposed to be one ofthe steps to reset.
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Old 11-02-2003, 06:10 PM   #7
cann
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u don't need to reset it
pump brake = drain the leftover batt
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Old 11-02-2003, 07:32 PM   #8
xtmx
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Listen to Cann.
I just replaced the right side TGV sensor. You have to push the sensor in with the plug (were you harness connects to the sensor) at the 12 o'clock position and rotate down to the 9 or 3 o'clock position (or the screw holes line up) or start in the with the plug in the 6 o'clock position and rotate up to the 9 or 3 o'clock position.
In other words the sensor is spring loaded, take a look at it you will figure it out.

Quote:
Originally posted by cann
hey i can help

u take out the thing
u see inside it's like > <
if u use a screwdriver, it turns
and u see on the car there is a ---

so u need to put that thing on the --- turn it a bit, and bolt the two screws

idea is
> < at 0 degree = low
> < at 45 degree = car works fine
> < at 90 degrees = high

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Old 04-18-2005, 06:32 PM   #9
WRXFan007
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Default Right TGV Sensor giving Low error P1088

OK, I had a shop work on my uppipe and when I got it back the CEL was on and giving P1088, which as I know now is related to the Tumble Generator Valve (right, or passenger side).

It looks like the mechanic probably slipped and hit the sensor housing with a tool, as there is a dent in the plastic, and what appears to even be a start of a crack near the edge.

Since this is on a '04 WRX, and it's not going away after a reset, I'm wondering this:

Do you think that I have to remove the Turbo in order to adjust it (assuming it's just nocked a little out of adjustment), or do you think I can simply remove both screws and try turning it a little one way or another instead of pulling it entirely out?

I am thinking It'll have to remove the turbo and pull out the TGV Sensor 2-3 inches just to adjust it...

Thanks for your help!
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Old 04-18-2005, 08:52 PM   #10
drale954
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You have to position the sensor 90degress. Trust me i have the APS tumbler deletes for my STI. I doubt there is anything wrong with the sensor. YOu have to put tension on the sensor.
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Old 04-18-2005, 11:24 PM   #11
SloRice
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cann is correct. I did the same thing.....its spring loaded and you have to put tension on the spring.
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Old 05-20-2005, 07:14 AM   #12
Peaty
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This thread helped me do my TGV sensor so I thought I'd post my scoobymods page incase like me someone did a search on the problem:

http://www.scoobymods.com/forums/showthread.php?t=5159
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