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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKV-A5 Golf/Jettas

VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old May 25th, 2020, 12:48   #16
ihredneck
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Quote:
Originally Posted by Mozambiquer View Post
I haven't ever had to mess with can on the VW cars, but I've done some on hd trucks. One of the common things which takes can down is a shorted intelligent device (sensor, module, etc.) At the obd connector pins 6 and 14 should be can high and low. If you check voltage between them, it should be koeo +-2 volts. If you check the ohms between them, it should be 60ohms. They should have no continuity to ground or to battery positive.
I tested across pins 6 & 14 on the OBD II connector.
- 67 ohms across pins
- 0V between pins
- no continuity to battery positive
- wasn't getting a positive continuity sound test to battery ground, but resistance fluctuated from 80 ohms to 200 ohms
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Old May 25th, 2020, 13:35   #17
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Quote:
Originally Posted by ihredneck View Post
I tested across pins 6 & 14 on the OBD II connector.
- 67 ohms across pins
- 0V between pins
- no continuity to battery positive
- wasn't getting a positive continuity sound test to battery ground, but resistance fluctuated from 80 ohms to 200 ohms
Was that with the gateway plugged in and key on? You should have no continuity to ground, which would mean you have a short to ground somewhere. Most often that would be in a module, but can also be a can wire rubbed through in the harness. Let me look at the can-bus wiring diagram for that car and there would be several checks you can do.
Was pin 6 or 14 higher ohms to ground?

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Old May 25th, 2020, 13:43   #18
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Orange and black will be can-bus high, orange and brown is can-bus low. They go from the datalink connector to the can gateway. Let me see if I can get you the wiring diagram.

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Old May 25th, 2020, 14:31   #19
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I sent you a PM with the diagram. Let me know if that works.

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Old May 25th, 2020, 14:38   #20
ihredneck
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The resistance fluctuated on both the pins rhythmically from ~80 ohms to ~120 ohms.
Thanks for the diagram I'll take a look!
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Old May 25th, 2020, 14:56   #21
ihredneck
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Took a peek at the diagram and it doesn't appear to match my car.
It shows a 20 pin OBD II port and has pin 14 as black/violet. My connector is 16 pins.
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Old May 25th, 2020, 16:29   #22
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Quote:
Originally Posted by ihredneck View Post
Took a peek at the diagram and it doesn't appear to match my car.
It shows a 20 pin OBD II port and has pin 14 as black/violet. My connector is 16 pins.
That's the gateway, the obd port is directly below that. It only uses a few of the actual wires.

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Old May 25th, 2020, 16:31   #23
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Just realized, you have can wires going to each door module. They often break where they bend. Not saying that is your issue, but it could happen.

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Old May 25th, 2020, 17:18   #24
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Yup, missed that section of the diagram!

I'll pull the harness out of the module and test for continuity against ground.

Yeah I checked the driver door harness and one of the wires has cracked insulation, but hasn't broke yet. I should check the others too.
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Old May 26th, 2020, 19:40   #25
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I started chasing wires tonight. The three chewed on in the ECM harness that goes into the cabin go to the power supply relay, steering column electronic systems control module and accelerator pedal position sensor 2.

Possible the control module relay wire shorted against either or both of the others and toasted the steering column module or accelerator pedal sensor.

Just a thought
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Old June 2nd, 2020, 14:00   #26
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Okie dokie.

I have resolution! Due to a blessing of the Lord and bringing to my attention of what I should look at, I gound the culprit.

What I didn't share is I purchased this car not running right and so had no history on it.
After digging into all the harnesses under the dash and engine bay, I was led to go over the fuse panels.
So got out the Bentley (and owners manual cause the engine base fuse box diagram is wrong in the Bentley) and fuse by fuse did a check.
I found that someone had moved the 5A fuse from the F12 position for the data bus on board diagnostic interface (J533) into the F11 position that has no use.
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Old June 2nd, 2020, 14:00   #27
ihredneck
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Okie dokie.

I have resolution! Due to a blessing of the Lord after some one on one time He brought to my attention of what I should look at, I found the culprit.

What I didn't share is I purchased this car not running right and so had no history on it.
After digging into all the harnesses under the dash and engine bay, I was led to go over the fuse panels.
So got out the Bentley (and owners manual cause the engine bay fuse box diagram is wrong in the Bentley) and fuse by fuse did a check.
I found that someone had moved the 5A fuse from the F12 position for the data bus on board diagnostic interface (J533) into the F11 position that has no use.
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Old June 3rd, 2020, 03:09   #28
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Awesome! That would explain it!
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