No preheating required in sub-zero temperatures

My Golf 4 (ASZ engine, 6-speed manual transmission) is now showing the "2". Winter experienced the following error at sub-zero temperatures:
1. I turn on the ignition, but the preheating indicator light doesn't come on.
2. Now, the ignition needs to be turned on for approximately 30-180 seconds (depending on the temperature - the colder it is, the longer it needs to be on), then turn the ignition off and on again. Now, the preheating indicator should light up, and you can preheat normally, then start the engine, and it should run perfectly. It doesn't start up before that either.

This effect does not occur at positive temperatures.

I once performed an Autoscan using VAG-COM.

Wednesday, December 31, 2008, 12:52:58:51313
VCDS version: DRV 805.1
Data as of: 20081206.
"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein wunderschöner Tag, um spazieren zu gehen oder ein Picknick im Park zu machen. Viele Menschen genießen das gute Wetter und verbringen Zeit im Freien."

Vehicle model: 1J - VW Golf/Bora IV
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75 76

Vehicle Identification Number: WVWZZZ1JZ3W158850 Mileage: 83,230 km
"Der schnelle braune Fuchs springt über den faulen Hund."
Address 01: Engine Control Module
Label file: DRV\038-906-019-ASZ.lbl
Part number: 038 906 019 HJ
Component: 1.9L R4 EDC 0000SG 1490
Encoding: 00002
Operating number: WSC 01391
WVWZZZ1JZ3W158850 VWZ6Z0B0230569

No error code found.
Readiness: 0 0 X X X

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 03: Brake Electronics Label file: DRV\1C0-907-37x-ESP-F.lbl
Part number: 1C0 907 379 M.
Component: ESP FRONT MK60 0102
Encoding: 0019970
Operating number: WSC 01391 785 00200

Sure, here is the translation of the text from German to English:

"1 error found:"
01314 - Engine Control Unit.
004 - No signal/communication - Sporadically.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 08: Air conditioning/Heating. Label file: DRV\3Bx-907-044.lbl
Part number: 3B1 907 044 C.
Component: CLIMATRONIC C 2.0.0
Encoding: 11000
Operating number: WSC 01391

No error code found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 15: Airbags
Label file: DRV\6Q0-909-605-VW5.lbl
Part number: 1C0 909 605 F
Part number: 02 AIRBAG VW61 0101 0001
Encoding: 12338
Operating number: WSC 01391

No error code found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 17: Control panel module
Label file: DRV\1J0-920-xx5-17.lbl
Part number: 1J0 920 826 C
Component: COMBINATION INSTRUMENT + TRIP COMPUTER. RB8 V24
Encoding: 01114
Operating Number: WSC 00000
WVWZZZ1JZ3W158850 VWZ6Z0B0230569

Sure, here is the translation of the text from German to English:

"1 error found:"
01314 - Engine Control Unit.
49-10 - No communication - Intermittent.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 19: CAN interface Label file: DRV\6N0-909-901-19.lbl
Part number: 6N0 909 901.
Component: Gateway K<->CAN 0001
Encoding: 00006
Operating number: WSC 01391

Sure, here is the translation of the text from German to English:

"1 error found:"
01314 - Engine Control Unit.
49-10 - No communication - Intermittent.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 46: Comfort System
Label file: DRV\1C0-959-799.lbl
Part number: 1C0 959 799 B
Component: 1C Comfort Device HLO 0003
Encoding: 00258
Operating number: WSC 01391

Part number: 1C1959801A
Component: 1C Törsteuer.FS KLO 0004

Part number: 1C1959802A
Component: 1C Valve Control.BF KLO 0004

Part number: 1C0959811A
Component: 1C Törsteuer.HL KLO 0004

Part number: 1C0959812A
Component: 1C Tõrsteuer.HR KLO 0004

No error code found.

"Der schnelle braune Fuchs springt über den faulen Hund."
Address 56: Radio Label file: DRV\1J0-035-18x-56.lbl
Part number: 1J0 035 186 D
Component: RADIO SON 0003
Encoding: 00001
Operating number: WSC 01059

No error code found.

"Die Sonne scheint hell, und die Vögel zwitschern fröhlich. Es ist ein perfekter Tag für einen Spaziergang im Park."

So far, based on the advice of a VW mechanic, I have replaced the following:
- Coolant temperature sensor (G2)
- relays 100, 103, 109, 167
It didn't make any difference.

I used freeze spray to treat temperature sensor G81 and engine control unit J248.
If I cool these two parts, the error doesn't occur, so it shouldn't be related to either of them.

What else can I do now?

Please replace the ignition switch .

I've now removed the engine control unit and deep-frozen it in the freezer for about 3 hours. And lo and behold, the error is back. After about 5 minutes, the control unit heats up, and the glow plugs activate again.
So, the engine control unit (ECU) is defective!
I am now looking for a VW engine control unit with the part number 038 906 019 HJ.
Does anyone happen to have something like that they're selling cheaply?

Best regards.

It doesn't have to be the exact same control unit. The important thing is that it's an EDC15 unit. A skilled tuner can then flash the appropriate software onto it, even if the control unit is from a 101 hp model. This has worked for me so far.

Stupid question from someone who isn't an electrical engineer:

Reacts to cold: possibly a faulty solder joint, something is contracting. Possible solution: Open the control unit and resolder (or have it resoldered).

EMSimASZ wrote:

It doesn't have to be the exact same ECU. The main thing is that it's an EDC15. A skilled tuner can then flash the appropriate software, even if the ECU is from a 101 HP model.

It has worked for me so far.
How many engine control units have you modified so far? That's not correct. I am aware of three different hardware revisions.

You can't just take "any" one. Since you can't know exactly what's inside the control unit before buying it, I would either recommend getting the identical control unit or, at the very least, a control unit for the same engine code from the same year of manufacture (where there's a high probability that the internal components are the same).

So far, in addition to the measures described in the original post, I have only done the following.
Control instrument, cold-treated. The error only appears on the motorcycle control unit.

Engine: ASZ
Engine Control Unit (all numbers printed on it):
038 906 019 HJ
Diesel EDC15P+ 1490.
28SA5579 1126 0966
0281010977 02-07-29

@rainer
There have been 2 stages so far.
1. In my Audi, I'm using a tuning module that produces 115 horsepower. I have two different data maps loaded on that module.
'For a good friend, I had a performance test done on his car, a 101 PS model, and it included two different data readings.'

Of course, we could have had the original ECUs reprogrammed, but we wanted to avoid opening the original ECUs. So, we simply used a different EDC15 ECU, which are readily available online for a very low price.

I didn't say that I did it myself; I had it done.

@ EMSimASZ:
May I ask where one can get something like that done?
Best regards.

For me, please send a private message for pricing.