No boost, no power, won't rev properly, cannot connect with Vagcom??

[syonarag60style]

My 99 A4 has just decided to start giving me some issues.....I don't know the history of the car, I bought it like this.

First, it won't rev out in neutral. For example, hit the gas, rev it up, get off the throttle, then back on, and it'll drop all the way to around 900 RPM's, then it'll start climbing again, even when you had your foot to the floor the whole time.

Second, when I do get it to drive (above 3000 RPM's, it has no power whatsoever, basically, no boost. You can't hear the turbo spool, whether driving or revving in neutral.

And third, I cannot connect to it with vagcom. The cable works, my vagcom works (confirmed by using it on my S4 and my wifey's A4), but I cannot get it to communicate with this car. I plug it in and the cable blinks red sometimes, sometimes green, sometimes orange, but won't read. It started to read the car once, then lost connection. I got Vag to connect and got two codes, before it lost connection.....VAG-COM Version: Release 512.4-UD

Sunday,01,June,2008,15:42:45

Chassis Type: 8D - Audi A4 B5
Scan: 01 02 03 08 15 16 17 25 35 37 45 55 56 57 67 75 76 77

-------------------------------------------------------------------------------
Address 01: Engine
Part No: 8D0 907 557 P
Component: 1.8L R4/5VT MOTR HS D06
Coding: 06201
Shop #: WSC 06335

2 Faults Found:
18010 - Power Supply Terminal 30: Voltage too Low
P1602 - 35-10 - - - Intermittent
17953 - Throttle Valve Controller: Malfunction
P1545 - 35-00 - -
Readiness: 0110 0101

.. That was as far as it got, then it lost it and won't reconnect....I'm kinda at a loss here....the battery did die, and then the car was jumped, hence the power supply terminal (I think)...the shop its at left the interior lights on, but maybe no??


Anyone with some suggestions where to go? Possibly an ecu failure hence the connection issues? N75? Mass air? Kinda at a loss right now where to go with this

Oh, also checked fuses.....only one that was popped was cig lighter, replaced that, did nothing

[audinutt]

if it wont communicate possible wiring or bad ecu?

[syonarag60style]

if it wont communicate possible wiring or bad ecu?

Checked the wiring and haven't seen any issues. I am going to pull the ecu out tonight and see if I can see anythung burned on the board....

[biketsai]

possibly fuse?

[bass_lover1]

A dead or dying battery does really strange things on these cars.

Try disconnecting the battery for a few hours to completely reset the ECU and see what that does.