jhoeppel

My car all of a sudden refuses to connect to my ProDiag (Palm-based scanner like Vag-com). I keep getting "ECU not present or not responding" after it retries a couple of times. I've used the ProDiag for several years without problem.

History: After I unplugged the MAF and caused the ESP warning to light up this morning, I turned the car off, plugged the MAF back in, cleared the code and drove to work. When I got to work I wanted to see the fuel trim numbers, so reconnected the ProDiag but couldn't connect to the ECU. I thought it might be a loose cable, but no amount of wiggling or reconnecting it helps. The car runs fine, no CELs. I just checked the scanner on my wife's Passat and it works fine, so I know the Palm, the software and cable are Ok.

I checked fuses and disconnected the battery for about 10 mins hoping to reset things, but no change. <b>What can I check now? How do you check the car when it won't let you check it?</b>

~john

TTinCT

uh oh...is it soldiered or flashed?

sTTevo

Does the LED on VAG cable light up? If not, probably blew fuse #12 (7.5A mini-fuse).

jhoeppel

whatever came from the factory in Gyor... original virgin OEM ecu

jhoeppel

Fuse #12 appears OK to the naked eye and tests out Ok with a multimeter.

sTTevo

Same happened on son's Jetta a couple of times. It just fixed itself a day or so later. Give it time

jhoeppel

who said these cars weren't haunted! (let's hope mine is the same)

LiTTespeed

but it tells me the ECU is not present..... think my connection in my palm is shoddy.

TTinCT

hopefully it is what is posted above....where i was going is bad.

jhoeppel

can you check yours on another VW/Audi to determine if its the car or Palm/cable combo?