I have a friend who Just picked up a 2001 GTI 1.8T (auto) and it has a Check Engine Light, but will not communicate with the scan tool. It does have an aftermarket radio, and I did unplug it for giggles, but still no comunication. the K line has 8V on it now.
Is there something IM missing here thats a common problem?
Took the emission test at two different facilities last week, both test failed with an error saying "OBD Communication Failure".
This is a 7 years old car, with 63K km, nothing has been changed on this car, it still has the original wiper blades .
I went to a VW dealership today (Toronto) and this is what they did:
- Performed ODIS diagnostics, results were ok, no DTC,s in the system
- Performed a drive clean, aborted due to communication error
- Performed technical diagnostics cap discharge system, ok.
- Tested ECM ok
- Performed basic wiring test, ok.
- Next step was to remove the cluster and perform 1598 pin out diagnostic - This is where I quit.
I assume at this point I need to go through drive cycle procedure since all codes have been cleared at VW, if it's possible that there is an issue only when generic scan tools (Clean Drive OBD test systems) are used, issues with Drive Clean system software, or there is something else?
I have a Mk4 GTI with the 24v vr6. Car wont start, just cranking for days. This all happened a week ago. I was at work, went on lunch at 12 and drove home to eat, come back at 1 and park it. 4 o clock I get off, try to start my car and nothing. Just cranking no turn over. Ive had no prior problems with this car, other than some misfires from 2 different coils, which I've replays 2 of them.
Car has absolutely no spark. Here's the parts I've regretted throwing at it because of this
-Coolant temp sensor
-Spark plugs
-Crankshaft sensor
-Fuel pump relay
I thought for sure it would of been the crankshaft sensor but I put it in and got nothing. I've checked all my fuses and they are all good. Finally got my code read with a vagcom last night and got these 2 codes
01177 no communication to ecu
01314 no communication to ecu
I also get no CEL when turning the key on "ON" which tells me ecu.
So I've kind of narrowed it down to 3 things, but it wouldn't surprise me if it was something else though. I think it's either the ECU, relay 428 for ecu, or wiring on the ecu. I swapped in a working BDF ecu and got nothing. I figured it would at least start and then cut off because of the immobiliser, but maybe im wrong. I know when my key imobiliser died it started and then cut off, maybe with a different ecu that's not married to the car is different and wont start, I am not sure. how this works.
So after the ecu swap didnt work I started reading wires. Going off the diagram here [URL] .....
I have found the following
a) pins 1/2 for ecu ground are OKAY read 12v
b) pin 21 read 12v
c) pin 3 would go to about .12 while cranking. idk what it is supposed to be
d) pin 23, which is ground to the relay 428, read .01, which is the same reading i got off the ground for the relay spot
e) pin 62 gave me nothing with the car off
So right now my concern is kind of on the relay 428. I don't know what it is supposed to read but that seems kind of off for .12v power while cranking and .01 ground. What should these readings be? should i be reading them while cranking?
I've done as much research as possible, why my Jetta won't start. Here's what happened. I've had the car for 11 months now, put in a new clutch, timing belt, water pump, cool packs, valve cover gaskets, 3" stainless downpipe, and rear springs when I got the car. My rear 02 sensor wire was hanging down below the car, after the downpipe installation. I didn't think much of it until the car died going down my driveway on a rainy day (Had a CEL for a vacuum leak) but right when it died I threw a scanner at it and I got a "no communication with ECM" message.
Cranks but doesn't start and CEL doesn't come back. I did some research and found out that my o2 sensors are in the same circuit or system. Well I found that 2 wires from the rear o2 sensor had shorted out and caused my car to die. I checked the 100 and 428 relays under the hood and they click like normal and seem to be working fine, pulled apart ecm and all looks well and so I reassembled it. The 409 fuse under the dash had just a tiny bit of soot or something covering a few of the prongs so I took the black plastic cap off of it and everything looks ok. Reassembled and reinstalled. Put a new crankshaft position sensor in it. Still nothing. None of the fuses in the side panel are blown either. I'm scratching my head on this one.
Plugging a multiple USB port into the single USB port? Does it work? For example a plugging a USB drive and an IPod?
View 4 RepliesSo I swapped an R motor into my 20th anniversary GTi. It idles fine as soon as I rev it and the idle comes back down it starts breaking up and I get a code for exhaust flap no communication. Of course, there is no communication since I don't have one. Is there a way to code this out or to trick the ECU to make it think its there? As soon as i clear the code the car runs fine, even if I just turn the car off and back on, it runs fine.
View 24 RepliesMy son has an 01 LeSabre Custom with 87k. He says the a/c isn't working. I tried to put my gauges on it tonight, but I couldn't find the low pressure service port, but there's two on the high side (one on either side of a tubing connector).
I figure it should be obvious. I'm worried that the system was previously dorked with...with the two high-side ports and no low-side port. But everything looks factory.
The dryer is in the front left (passenger) of the engine compartment (when standing in front of and facing vehicle). I see the low-side line from evaporator come into it, then out of it down to the compressor in the center bottom, behind radiator. No port that I can find.
While looking for the a/c port, I also saw CVJ grease splattered all over on the driver side...it's always something. Just bought this last February (couldn't check the a/c too well) to replace the very nice 00 LeSabre 55k we bought in November for him. But the 00 didn't survive the collision with the truck that pulled in front of him...
The Bentley shows the A/C recharge port behind the passenger headlight but I couldn't find it there. I did find a port by the passenger side strut tower. Is that the correct port?
View 6 RepliesI noticed this on my A3... This weekend I was working on the car and heard air leaking somewhere when the car was on. I pinpoint the leak on the upper left side of the engine where to my guess is a vacuum port. This hose leads to the brake booster. Apparently it's a plastic hose and it had split open near the port. I cut out a section of it and used some coolant hose I had laying around from my MKIV gti. Just thought I let you 3.2's know in case you want to check it out.
What is the function of this? is it to provide vacuum to the brakes? I pulled the hose while the engine was running and it wanted to die just to see if it would cause any issues. Also I may add that before this I've had some engine stuttering at idle where the rpm needle would fluctuate from like 600 rpm to 500 rpm and back up at times and that after replacing that bad section of hose it seems to have corrected that issue as well. I know there have been some stuttering issues around here and have heard that replacing the battery has worked at times.
I recently picked up an 01 jetta and the day after i bought it the check engine light came on with a 3 codes. i erased the codes and than after a day of driving the light came back on with code p0171.
I did some research and figured i should get a new air filter and clean the MAF but i was waiting until pay day.
Today, about a week later, the ASR light came on and won't come off so i ran the obd again and now there is codes P0171, P0102 so i cleared them again to see if the ASR would should off. the check engine light is off for now but the ASR came right back on when i started the car.
Decided to re use a thread I no longer needed, the problem. Was driving my 01 Jetta, cel and epc came on, would drive kind of rough (typical "replace your cool pack" question) but parked at home and when I went to drive again not a problem for two days then today no epc but the cel was flashing?.. Then again 20 mins later after parking the car it drove fine?.. I'm confused wouldn't a bad coil pack be consistent with the cel or rough idle/ driving? Would swapping around the coils work for this? Or should I try find the specific bad one and just replace it?
View 5 RepliesLong story short, bought a 2001 GTI VR about a month ago and have been doing little fixes to get it up to snuff. Went to put gas in the other day and it took about two gallons before spitting gas back out the filler hole. Car has no codes or lights on, so I'm thinking this is a potential clogged vent tube, as the car was sitting for a few months (has spider webs all over the passenger rear wheel well). I've searched and can't find anything except for TDI related stuff.
View 2 RepliesSo i have a mk4 jetta vr6, just did my motor swap went smooth... The car starts runs, when i shut my motor off and go to start it again when it is warm/hot.... it doesnt want to start.. just keeps turning n turning.... I have been through a couple of threads people recommended to change the coolant temp sensor... been there done that yesterday.... n no results thus far... same problems... the car has been sitting for a year since i had done any work to it...
View 8 RepliesI have a 2001 GTI 1.8T, and it's refusing to start. It turns over and all power accessories work, so I've ruled out that the battery is dead.From the bit of research I've done, I wonder if it's a fuel issue or something to do with the coil packs.The only thing to be mentioned is that about 3 days before this occurred, I left the headlights on while I was away from the car. A quick boost and that problem was solved. I wonder if this could be related at all.
View 24 RepliesI just bought a 2001 Jetta with a VR6 with water in the gas. So far I've drained the tank (got probably 20oz of water out of the 3gal of gas) and put in fresh gas, replaced the fuel pump and the spark plugs. When I disconnect the return line I'm now getting nice clean gas but it will not fire. Although it will fire on ether. Anything else i should do? I have the full version of VCDS and am not getting any codes.
View 2 RepliesI have a '01 Jetta VR6 that wont start. Turn the ignition, all lights/radio work, 12.2 volts at battery 11.4 volts at solenoid and it doesnt even click. Replaced the starter, same thing. Have checked all fuses, everything looks good. Jumper from the solenoid to the battery and the car starts. Thoughts?
View 2 RepliesI have a 1.8t Jetta 2001 auto and the these lights are on the dash, car runs fine, plugged in using a basic scanner and no codes are found?
View 1 RepliesI have an 01 gti vr6 5speed... All of the sudden, i cant get the car to shift into 2nd and 4th and neutral still sits in the middle, but way back, almost where 4th should be. It seems like everything is out of alignment somehow. I parked the car, went into the store, came out of the store and drive away and the problem started. Just like that, no warning.
View 3 RepliesI have a 2001 jetta mk4 and I was thinking about getting some halo lights for it. But then I thought it would be useless because the headlights are always on regardless. So is it normal for the headlights to be on all the time? And if it is, is there a way to bypass the headlights so if I did,get halo lights, only the halos would light up?
View 5 RepliesMy girlfriend recently picked up a 2.0 Jetta, had her dad drive it 800 miles with no issues except a code for needing a new thermostat. A few weeks ago, we were out for a drive getting on the freeway and all of a sudden the gas just cut out on her. Then on a separate occasion, did the same thing except this time the power steering was gone and the brakes wouldn't depress. I told her to click it into neutral and then back to drive next time it happens, so she did and then it was like nothing ever happened. Weird, right? I don't really have any leads on where this could be coming from, since it's so intermittent.
View 2 RepliesI have a standard 2001 model VW Golf 1.6L automatic. For the size of the engine it has it is pretty noisy.
View 8 Replies