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Cleaned MAF and throttle body and now car is throwing CEL's


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Car has been idling erratic upon start-up (no CEL's) for awhile. So after reading quite a few old posts I decided to clean my MAF and the throttle body. The MAF looked fine but I cleaned it anyway. The throttle body was pretty guncky on the back side so I cleaned it, removed the butterfly plate and cleaned it really good all around the edges and then I reinstalled everything. I also used the MAF sensor cleaner on the Bosch sensor inside of the "Y" pipe (not sure what the sensor is)

I reset the ECU via turning on the ignition and letting it sit till I heard the clicks in the enginge compartment, then I turned it off, and started it. First thing it did is idle way up to about 2500 and then idle way down and die. I restarted it, and it did the same thing, so I blipped the throttle to keep it running. So I took it for a drive and it drove fine. I did notice that the idle was a little high at stops with the A/C off, so I turnned off the A/C and the idle went up even higher.

Drove on a little bit more and then it threw a CEL. But it drove fine and at stops it was idling high but very consistant. So I stopped at a store and went inside, came out a few minutes later and the car wouldn't start. I reset it again and then it would start but it did the rev to 2500 and then way down and died.

So I got it home and checked the codes:

DTC Count = 3

Fault Number:P1109

Description:Porsche fault code 594 - Input variables charge

Repair Infomation:measurement

DTC Count = 3

Fault Number:P1504

Description:Porsche fault code 410 - DVE fault: necessary intake air

Repair Infomation:positon

DTC Count = 3

Fault Number:P0507

Description:Porsche fault code 32 - Idle control at stop

Any clues? my wife says every time I fiddle with someting it's worse after I mess with it, Im starting to believe her.

Also: what is the correct part number for the MAF? I've done numerous searches and I've seen two to three different part numbers.

I want whatever is the newest version that doesn't require the dealer to reprogram the ECU.

Any ideas would be appreciated.

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  • Admin

Is this a 2004 996 TT (per your profile)?

P0507 Idle air control at stop - above limit

Possible fault cause

- Throttle is jammed

- Leaks in intake air system

P1109 Input variables, charge measurement - above limit

Possible fault cause

- Heavily soiled throttle

- Throttle adjusting unit faulty

- Mass air flow sensor faulty

P1505 Throttle Jacking Unit, Control Range - Open Circuit

Possible fault cause

- Open circuit

- Short circuit to B+

With all of these fault codes point to the throttle control I would start there.

Either something is not plugged in or something is jamming the throttle or there is an air leak.

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Is this a 2004 996 TT (per your profile)?

P0507 Idle air control at stop - above limit

Possible fault cause

- Throttle is jammed

- Leaks in intake air system

P1109 Input variables, charge measurement - above limit

Possible fault cause

- Heavily soiled throttle

- Throttle adjusting unit faulty

- Mass air flow sensor faulty

P1505 Throttle Jacking Unit, Control Range - Open Circuit

Possible fault cause

- Open circuit

- Short circuit to B+

With all of these fault codes point to the throttle control I would start there.

Either something is not plugged in or something is jamming the throttle or there is an air leak.

How much of a gap should there be between the butterfly plate and the walls of the throttle body? And should the plate when its closed be completely up and down or is it at a slight angle? I noticed that the plate never completely closes / forms a tight seal with the wall. What is the "Throttle Adjusting Unit?"

Could my manually opening the butterfly plate hurt the throttle body?

The cars is a '04 Turbo

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Is this a 2004 996 TT (per your profile)?

P0507 Idle air control at stop - above limit

Possible fault cause

- Throttle is jammed

- Leaks in intake air system

P1109 Input variables, charge measurement - above limit

Possible fault cause

- Heavily soiled throttle

- Throttle adjusting unit faulty

- Mass air flow sensor faulty

P1505 Throttle Jacking Unit, Control Range - Open Circuit

Possible fault cause

- Open circuit

- Short circuit to B+

With all of these fault codes point to the throttle control I would start there.

Either something is not plugged in or something is jamming the throttle or there is an air leak.

Loren,

You listed fault P1505, is that the same as P1504?

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  • Admin

My mistake...

P1504 Throttle jacking unit, emergency air position - signal implausible

Possible fault cause

- No adaptation performed

- Throttle part

Throttle jacking is the egas throttle control on the side of the throttle body.

Is it unplugged?

Does the throttle butterfly move smoothly? Does it return closed when released?

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My mistake...

P1504 Throttle jacking unit, emergency air position - signal implausible

Possible fault cause

- No adaptation performed

- Throttle part

Throttle jacking is the egas throttle control on the side of the throttle body.

Is it unplugged?

Does the throttle butterfly move smoothly? Does it return closed when released?

It's plugged in for sure.

When I push the butterfly in, it does close smoothly, but I noticed that it doesn't go completely vertical and there is a small opening between the plate and the sidewall.

Is there something I else I needed to do after I put everything back in beside the reset/adaptation?

Just find it odd that it's throwing all of these codes after I cleaned it and put it back together, leads me to believe it was something I did and not just sensors going haywire.

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Something is not right in the the throttle body.

Did you remove the throttle body to clean it?

I did remove it.

I think I might have figured it our Loren, the butterfly plate wasn't centered correctly and it was keeping it from closing all the way, hence the high idle. I hae yet to drive it yet due to breaking a hose clamp which I now have to go buy, but hopefully that's the fix...

Sorry about the other post where I listed a website with service manual references, I just see people on the boards always looking for them and I figured I'd help. Didn't think about copyright enfringements.

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  • 3 years later...

I also had P1109 input variables charge measurement on my 996TT. A few days ago, I erased the fault codes with my Durametric and the CEL was gone. Then, I went out for a short drive this Christmas morning and suddenly the CEL lit up after about a mile from my home. I went back home, plugged the Durametric and erased the code. Now, there is no CEL, but Im afraid it will come back again unless I find the cause.

I just replaced my TB and plenum with an Agency Power Plenum and throttle body from Vivid Racing. It was fine after installing the TB for several weeks until one morning the CEL lit up and the P1109 came out in my Durametric. Can anyone give any information on what to do?

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