2003 VW Passat 1.8L Turbo

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ruthymimi

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Could be a bad throttle body or wiring.
First remove it and clean it.
Also check O2 sensor wiring known to short out against body and do damage to ECU.

This is a TSB for a wiring issue at connector. It is not for you car but does apply because it's the same connector. Take note there are two different connectors match yours.

How is the idle?
Does it rev up and down with gas pedal?

Good Luck
no it does not. It immediately shuts off after it turns on.
 
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vwtech

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@EuroX Said TSB for connector doesn't apply. But I disagree it's the same connector and pins GOLD plated.
They Just never did a TSB for yours. But if connector is the exact same I say it applies. If it fails in one then it can fail in yours.

Been awhile but I know 100% shorted O2 wires can Kill 1.8T ECU. Seen it twice. So I too would be worried about ECU maybe killing Throttle body after 2 of them.
Both I have seen ECU worked. Car ran just throttle body codes and engine would not rev. no control of throttle body at all just idle.

Can't hurt to get an eye on the O2 wring at sensors.


Good Luck
 
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ruthymimi

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@EuroX Said TSB for connector doesn't apply. But I disagree it's the same connector and pins GOLD plated.
They Just never did a TSB for yours. But if connector is the exact same I say it applies. If it fails in one then it can fail in yours.

Been awhile but I know 100% shorted O2 wires can Kill 1.8T ECU. Seen it twice. So I too would be worried about ECU maybe killing Throttle body after 2 of them.
Both I have seen ECU worked. Car ran just throttle body codes and engine would not rev. no control of throttle body at all just idle.

Can't hurt to get an eye on the O2 wring at sensors.


Good Luck
At this point I’m willing to try any and everything. I love the car and I'm going to get it running again! Thank you!😇
 
   #24  

Jef

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I'm going to purchase an accelerator pedal.

Please don't. The odds of a failed accelerator pedal is 0.0000001% chance, and that is down hill with a tail wind. 01-08-062, the 3rd and 4th fields show the accelerator pedal and when we looked at that data, it was good.

The only times I've ever seen failed accelerator pedals... flood or physical damage... so unless you crashed into a river, I'm about 99.9999998% positive you'll have a good pedal already in the car.

If there isn't an issue with the throttle body itself, and wiring is good..... this could just be a bad ECM.
 
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EuroX

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At this point I’m willing to try any and everything. I love the car and I'm going to get it running again! Thank you!😇
I love mine more it's a 2004 with 48k original miles on it.
 
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vwtech

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I also agree with Jeff. Doing these and talking on this forum over the years. I have changed pedal a few times in the beginning and it never worked for me. I also don't ever remember it working with other thru the forum.
Before TSB was ever printed in these older ones after new throttle body's. I fixed a few by a whole wiring overlay harness of all 6 wires from ECU to Throttle body. Super PITA!
Never saw one kill new throttle body your would be the first for that.

I have seen bad Throttle body.
I have seen TSB for connector.
I have seen overlay harness of all 6 wires to ECU.
I have never seen a pedal fix one or heard of it fixing one. But have tried.
I have seen O2 wires kill ECU control of Throttle body but not damage throttle body.

I will also state I tried real hard to locate an actual bad wire and never could thru Ohm test, voltage drop test and even load test wires with a few amps. And that drives me nuts!!!
No idea why I could never actually find a bad wire? But then an overlay harness fix them.

Good Luck
 
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EuroX

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I also agree with Jeff. Doing these and talking on this forum over the years. I have changed pedal a few times in the beginning and it never worked for me. I also don't ever remember it working with other thru the forum.
Before TSB was ever printed in these older ones after new throttle body's. I fixed a few by a whole wiring overlay harness of all 6 wires from ECU to Throttle body. Super PITA!
Never saw one kill new throttle body your would be the first for that.

I have seen bad Throttle body.
I have seen TSB for connector.
I have seen overlay harness of all 6 wires to ECU.
I have never seen a pedal fix one or heard of it fixing one. But have tried.
I have seen O2 wires kill ECU control of Throttle body but not damage throttle body.

I will also state I tried real hard to locate an actual bad wire and never could thru Ohm test, voltage drop test and even load test wires with a few amps. And that drives me nuts!!!
No idea why I could never actually find a bad wire? But then an overlay harness fix them.

Good Luck
Changing the pedal works 10 times better than that bogus TSB. Been there done that what a waste of time, just like the TSB vw has for misfires that they claim roller rockers are the issue. Just a load of bullshit. It always throttle body or throttle pedal never wiring especially on a 1.8t from those years. Been a proven fact that these pedals fail or have interference as they wear inside. Nothing new. Everyone in the motorsports world knows this thats running a standalone with TBW:

 
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vwtech

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@EuroX

With all love and respect because I KNOW YOU KNOW YOUR SHIT!

I am just going by my experience. And I didn't say shit about pedal till @Jef said what I was thinking. And Jef knows his shit also. LOL
Back in the day I bought I few of these cars where customers just wanted the car gone because they were sick of wasting money.
New ECU, New Throttle body, new pedal. I fixed them, sold them, and had remained the mechanic till they died.
One was VR6 other was 1.8T Both Jetta's.
Overlay harness fix both.

We will just have to disagree on this one.

I got $100 pedal doesn't fix it. LOL
What do you say?


Good Luck
 
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Did you do the BS ignition on and group 060?
 
   #31  

EuroX

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@EuroX

With all love and respect because I KNOW YOU KNOW YOUR SHIT!

I am just going by my experience. And I didn't say shit about pedal till @Jef said what I was thinking. And Jef knows his shit also. LOL
Back in the day I bought I few of these cars where customers just wanted the car gone because they were sick of wasting money.
New ECU, New Throttle body, new pedal. I fixed them, sold them, and had remained the mechanic till they died.
One was VR6 other was 1.8T Both Jetta's.
Overlay harness fix both.

We will just have to disagree on this one.

I got $100 pedal doesn't fix it. LOL
What do you say?


Good Luck
I got respect for you guys, I guess we're basing our opinions of stuff we've dealt with and seen. All good, it varies, I would take that bet if OP was getting a brand new factory pedal. But without knowing what the source will be I won't go that far. At the end of the day B5.5 passat's to me from what I've seen and i've owned 20 of those cars never have I had a issue with wiring to the throttle body, it was always TB or throttle pedal. Now on B7 audi a4's sure wiring for TB is possible but again, in most of my cases it was TB or pedal.

Then again do you really wanna loose $100? :D
 
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   #32  

ruthymimi

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Please don't. The odds of a failed accelerator pedal is 0.0000001% chance, and that is down hill with a tail wind. 01-08-062, the 3rd and 4th fields show the accelerator pedal and when we looked at that data, it was good.

The only times I've ever seen failed accelerator pedals... flood or physical damage... so unless you crashed into a river, I'm about 99.9999998% positive you'll have a good pedal already in the car.

If there isn't an issue with the throttle body itself, and wiring is good..... this could just be a bad ECM.
ok
 
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PetrolDave

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When i press down the accelerator pedal completely the 'accelerator pedal position sensor' only reads 75%.
Sounds correct, the pedal never goes to 0% or 100% to leave those values as indicative of a fault.
 
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   #34  

ruthymimi

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I got respect for you guys, I guess we're basing our opinions of stuff we've dealt with and seen. All good, it varies, I would take that bet if OP was getting a brand new factory pedal. But without knowing what the source will be I won't go that far. At the end of the day B5.5 passat's to me from what I've seen and i've owned 20 of those cars never have I had a issue with wiring to the throttle body, it was always TB or throttle pedal. Now on B7 audi a4's sure wiring for TB is possible but again, in most of my cases it was TB or pedal.
My mechanic and I are learning from all the info here. I'm in an area where everyone owns a Tesla and mechanics are not trained with VW and clutches. This is why I'm here. I'm not leaving until it's running again. I appreciate all of the help.
 
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   #35  

EuroX

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My mechanic and I are learning from all the info here. I'm in an area where everyone owns a Tesla and mechanics are not trained with VW and clutches. This is why I'm here. I'm not leaving until it's running again. I appreciate all of the help.
Agreed, Honestly I would verify that you have a good known throttle body. If you are able to perform basic settings on the throttle body one would assume the throttle body is ok. Does the vehicle start and run? Can you verify throttle plate position when vehicle is running? or provide MVB for throttle %?
 
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ruthymimi

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Sounds correct, the pedal never goes to 0% or 100% to leave those values as indicative of a fault.
ok. When i used my finger to open the throttle the first field went all the way up to 93% so my mechanic assumed the pedal should as well. So it sounds like we can eliminate replacing the pedal and move to the next possibility. I gather all the info here and then call him to make sure I don't screw up anything. We are working through it together.
 
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ruthymimi

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Agreed, Honestly I would verify that you have a good known throttle body. If you are able to perform basic settings on the throttle body one would assume the throttle body is ok. Does the vehicle start and run? Can you verify throttle plate position when vehicle is running? or provide MVB for throttle %?
It doesn't run. It starts and immediately dies.
 
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