2001 Jetta 1.8T 032 DL - NO VCDS communication in car

Trying to help a friend with his 2001 Jetta.
Car cranks, starts, dies after 2 sec.
First though immo kicks in (and could well be).
Plugging VAGcom in, does not connect to ANY module.
Plugged another ECU I had on hand, same behavior.
Took the ECU out and plugged into my bench setup. Connects/reads fine (scan below).

Radio removed (read aftermarket radio can mess with K band).

What can I try next to get the car running?
What might cause the issue?
What should I unplug (in order of priority/likeliness of causing the issue)?

ECU BENCH scan (not in-car scan since NO communication when in car):

Monday,22,July,2019,15:22:40:03761
VCDS Version: Release 19.6.1 (x64) Running on Windows 7 x64
www.Ross-Tech.com

Address 01: Engine Labels: 06A-906-032-AWW.lbl
Control Module Part Number: 06A 906 032 DL
Component and/or Version: 1.8L R4/5VT G 0004
Software Coding: 07500
Work Shop Code: WSC 14130
VCID: 6BD44A4B198B41175C-5140
17 Faults Found:

17524 - Oxygen (Lambda) Sensor Heating; B1 S1
P1116 - 35-10 - Open Circuit - Intermittent
17526 - Oxygen (Lambda) Sensor Heating; B1 S2
P1118 - 35-10 - Open Circuit - Intermittent
17522 - Oxygen (Lambda) Sensor; B1 S2
P1114 - 35-10 - Internal Resistance too High - Intermittent
16502 - Engine Coolant Temp. Sensor (G62)
P0118 - 35-00 - Signal too High
17511 - Oxygen (Lambda) Sensor Heating; B1 S1
P1103 - 35-10 - Performance too Low - Intermittent
17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28)
P1340 - 35-10 - Incor. Correlation - Intermittent
16514 - Oxygen (Lambda) Sensor B1 S1
P0130 - 35-10 - Malfunction in Circuit - Intermittent
17633 - Fuel Injector for Cylinder 1 (N30)
P1225 - 35-10 - Short to Ground - Intermittent
17635 - Fuel Injector for Cylinder 3 (N32)
P1227 - 35-10 - Short to Ground - Intermittent
17636 - Fuel Injector for Cylinder 4 (N33)
P1228 - 35-10 - Short to Ground - Intermittent
18010 - Power Supply Terminal 30
P1602 - 35-10 - Voltage too Low - Intermittent
16622 - Manifold Pressure / Boost Sensor (G31)
P0238 - 35-00 - Signal too High
17071 - ECM Power Relay Control Circuit
P0687 - 35-00 - Short to Plus
18057 - Powertrain Data Bus
P1649 - 35-00 - Missing Message from ABS Controller
18058 - Powertrain Data Bus
P1650 - 35-00 - Missing Message from Instrument Cluster
16497 - Intake Air Temp. Sensor (G42)
P0113 - 35-00 - Signal too High
17931 - Crash Signal from Airbag Controller
P1523 - 35-00 - Implausible Signal

Readiness: 0010 1101

Check fuses as per JPPSG

Unplug each module on K line until you establish communication and check the ground daisy chain to the airbag control module.

Start with ABS and radio first.

Don't crash the K line Kraft.........

Click to expand...

Plug up to the car, go to [Options], then [Test]. What are ALL of the results?

Jef said:

Plug up to the car, go to [Options], then [Test]. What are ALL of the results?

Click to expand...

Jef, will do at next opportunity (car is 1/2 hour drive from me) and post up.

Jack@European_Parts said:

Check fuses as per JPPSG
Unplug each module on K line until you establish communication and check the ground daisy chain to the airbag control module.
Start with ABS and radio first.

Click to expand...

Will do again (since it has been a while), but I did unplug ABS (and radio is out). ABS was on the list of k band murderers I read elsewhere so that was done. Also disconnected O2 sensor.
Checked for fuel (aftermarket (walbro) pump running, fuel coming out rail).

Not sure easy the instrument cluster can be removed from Jetta, but should that be next?
Can door module (I think locks not working) cause it?

Suggestions for next module to unplug.

That string of faults screams FP relay too or a problem with OXS heaters in car better have a look at that too!

See if by plugging in you can get the gateway 0x19 in the cluster too and look at advanced block or 125 area values for communications on internal W CAN high/low network.

I will hazard a guess the LED on the HEX+CAN (HUC) goes solid red when plugged up and your port test will be K-Line short to ground or B+. Unplug the HUC and then decide what control module is easiest to unplug, then retest... repeat as needed until you get communication.

Jack@European_Parts said:

That string of faults screams FP relay too or a problem with OXS heaters in car better have a look at that too!

See if by plugging in you can get the gateway 0x19 in the cluster too and look at advanced block or 125 area values for communications on internal W CAN high/low network.

Click to expand...

OXS are unplugged (if OXS is some sort of ghetto for 02 sensors?). Can they (or the wiring to the connector) still cause problems? If so, how to verify?

Will check the FP relay (need to locate it first). How would the FP relay prevent VAGcom from connecting to all modules?

Don't know how to access 0x19. Only know enough VCDS to go to modules, blocks; measurement and advance measurements.

Jef said:

I will hazard a guess the LED on the HEX+CAN (HUC) goes solid red when plugged up and your port test will be K-Line short to ground or B+. Unplug the HUC and then decide what control module is easiest to unplug, then retest... repeat as needed until you get communication.

Click to expand...

I agree. When I last tried to troubleshoot, we unplugged radio, ABS and O2 for that reason. But never went further. Need to get a list of potential modules that might be in a 2001 Jetta Wolfsburg 1.8T. Then determine order of 'unplug and test'.

OXS are unplugged (if OXS is some sort of ghetto for 02 sensors?). Can they (or the wiring to the connector) still cause problems? If so, how to verify?

Click to expand...

Sure could by corrosion bridge .....use RTFB and WD and trace, test with load light & DVOM for cross!

Will check the FP relay (need to locate it first). How would the FP relay prevent VAGcom from connecting to all modules?

Click to expand...

It wouldn't just reporting on the limited data you provided as a heads up.

Don't know how to access 0x19. Only know enough VCDS to go to modules, blocks; measurement and advance measurements.

Click to expand...

0x19 is the gateway in the cluster.

https://forums.ross-tech.com/showthread.php?3147-What-is-Jack-talking-about-0x01-08-000

here is a Mk4 2002 Golf manual that I scanned.
Assuming that i can't unplug the ECU, I will start with central conv. Not sure CAN Gateway module is, but likely that should also not be unplugged for the test? ABS already out. HVAC (no on this list, assume manual HVAC has not module). ABS already done, Radio done.

Airbags would be next, not sure where that module is (front way under the center dash on the tunnel, like on A4, A6, Passat?).

Other modules?
Address 01: Engine Labels: 06A-906-032-AWP.lbl-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1C0-907-37x-ASR.lbl-------------------------------------------------------------------------------
Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl-------------------------------------------------------------------------------
Address 17: Instruments Labels: 1J0-920-xx5-17.lb-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl -------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 1C0-959-799.lbl

"GATEWAY" is in CLUSTER & in COMBINATION with 0x17 & 0x19

Keep in mind Kraft that if gateway is offline in cluster you will lose COM with everything if K line is shorted too since is the network hub.

Just to add: I checked +12V power and ground at ECU connector.

Just to add: I checked +12V power and ground at ECU connector.

Click to expand...

Did you check for power & ground at the DLC?

This is a single want a double?

Jack@European_Parts said:

Did you check for power & ground at the DLC?

Click to expand...

No, only on the ELC, pin 3.
Where is the DLC gttx pr f_m, whxt p #?

https://wiki.obdtuning.de/images/a/ac/VAG_ME7.x.jpg

No, only on the ELC, pin 3.
Where is the DLC gttx pr f_m, whxt p #?

Click to expand...

Another cheesy and vague awesome question Kraft?

The DLC is the Data Link Connector or is also known as the OBD2 or On Board Diagnostic PORT!

A double cheddar it is........

You know I love ya right, I love cheese?