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Discussion Starter #1 (Edited)
**700+ views-and no comments?! c'mon guys. Tb and ecm codes - dealer no help...

2001 jetta mk4 1.8t aww

I posted throttle body codes on another thread and found out i need a new throttle body. I went to the dealer and paid for diagnostics, they said get a new TB, and the secondary air pump needs to be replaced soon - but that will not cause these issues. I bought TB online and put it in, took it to the dealer and had them adapt it. then it kept going back to what it was originally doing - engine idle goes up and down and sputters until it dies, ECU and check engine lights come on and all the TB codes - misfires, and a new code comes up for the ecu (p1064 INTERNAL CONTROL MODULE DRIVER ERROR) also now the car dies while driving down the road. the dealer re-adapted the TB for free 2 more times, with no resolve.
I got my vagcom fully functional, and got nefmoto running to flash the ecu. I flashed - adapted - cleared the codes etc. the new TB will not adapt. Vagcom just says error and wont adapt.
So now i get a refund for the TB and ship it back - I put the old one back on, flash the ecu again, adapt the TB and it goes without a hitch. 2 days later all the codes come back and the car dies while driving it. A new code comes up in addition to the others (18010 - p1602 power supply terminal 30 - voltage too low).
Today the check engine light started blinking during cold start.
What am I missing here? Do i need a new ECU, new TB, both? is there something else causing all this that would seem unrelated? the dealer says no...
here are the codes that usually come up,

Faults
17972 - P1564 Throttle valve control part (J338)
insufficient voltage during basic settings, 35-10, intermittent
17579 - P1171 Throttle/Pedal Position Sensor/Switch-B-Circuit (G188)
implausible signal, 35-10, intermittent
17950 - P1542 Angle sender 1 for throttle valve drive (G187)
implausible signal, 35-10, intermittent
17705 - P1297 Connection charger-throttle valve
Pressure drop, 35-10, intermittent
17976 - P1568 Throttle valve control part (J338)
Mechanical malfunction, 35-10, intermittent
16684 - P0300 Random/Multiple Cylinder
Misfire Detected, 35-10, intermittent
16687 - P0303 Cyl.3
Misfire Detected, 35-10, intermittent
16688 - P0304 Cyl.4
Misfire Detected, 35-10, intermittent
16685 - P0301 Cyl.1
Misfire Detected, 35-10, intermittent
16686 - P0302 Cyl.2
Misfire Detected, 35-10, intermittent
18010 - P1602 Power Supply (B+) Terminal 30
Low Voltage, 35-10, intermittent
16396 - P0012 A Camshaft Position (Bank1)
Timing over-retarded, 35-10, intermittent

Any help, or suggestion will be greatly appreciated.
 

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ECU might not be getting enough power.

Check your alternator and battery, terminals. Could unplug your ecu and hit the harness with a meter. It should be getting constant 12 volts.
Check the engine management fuses and the ecu relay.
 

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Discussion Starter #8
one thing i did not mention is a couple weeks ago i changed the thermostat and forgot to undo the neg. term. and i had an arc with a socket on the alternator. nothing really seems different since it happened and the battery/alternator test out good...
 
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