2004 golf 2.0 automatic, crank no start

   #21  

rabbitpower

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Terminal 30 should be hot at all times from fuse 37. and also supply power to ECU pin 62.
IF not check fuse 37 for power.

If power is at fuse 37 and terminal 30 of relay?
Jumping terminal 30 and 87 (fused jumper) should provide power to ECU pin 121 and pin 6 of ignition coil. Black/Purple wire.

Good Luck

Terminal 30 on ECU relay is dead. No voltage present at any time.

So if there is no voltage present at fuse 37 is not being supplied through relay by ignition?

Also on the ecu connectors, does anyone have a pinout showing the connector dead on?. I'm rudimentary with electrical schematics so the clearer the better.
 
   #22  

Jack@European_Parts

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So if there is no voltage present at fuse 37 is not being supplied through relay by ignition?

Also on the ecu connectors, does anyone have a pinout showing the connector dead on?

Yes & yes

Time to RTFB and make donuts!


https://erwin.vw.com/erwin/showHome.do

Print to PDF to save for later..........

Learn what a tone generator does
610ak4O7OZL._SX425_.jpg






 
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   #23  

vwtech

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I would check all connections at battery and battery fuse box.
the big main fuses feed the fuse 37
Take this with caution because I do not know what engine code you have.

You really need to use a wiring diagram!
If you can't get one or read one and you keep warning me your no good with electrical work.
You really should seek local help with this.

Do not hold me to any of this! Work at your own risk.

Good Luck
 
   #24  

rabbitpower

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Yes & yes

Time to RTFB and make donuts!


[/COLOR]https://erwin.vw.com/erwin/showHome.do

Print to PDF to save for later..........

Learn what a tone generator does
610ak4O7OZL._SX425_.jpg







Im going to order a Bentley this weekend. For now I'm using what I can find on the web, you know because that's always reliable however I am beginning to think the problem is much simpler than I anticipated. Hopefully. Still learning electrical troubleshooting, its my main weakness as a Mechanic. I can build engines all day long, diagnose mechanical problems, no sweat. Electrical leaves me in a dark corner crying and sucking my thumb. I'm working on it though.....
 
   #25  

Jack@European_Parts

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I'm happy to help advance you.
PM me your email than complete my website contact form.
 
   #26  

rabbitpower

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I'm happy to help advance you.
PM me your email than complete my website contact form.

Thanks Jack, will do.

I just went out and checked fuse 37. It read 11.5v ( 12.4 at battery) my slightly-better-than-a-harbor-freight meter may or may not be the culprit. Im looking for a better meter, and also how to properly use it.

I checked every fuse with an engine symbol as follows:

29= No voltage
43= 11.5v
34= No voltage
32= No voltage
10= 11.5v

probed sockets, same issue.

I should add that when I open the door I hear the fuel pump prime.
 
   #27  

rabbitpower

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I would check all connections at battery and battery fuse box.
the big main fuses feed the fuse 37
Take this with caution because I do not know what engine code you have.

You really need to use a wiring diagram!
If you can't get one or read one and you keep warning me your no good with electrical work.
You really should seek local help with this.

Do not hold me to any of this! Work at your own risk.

Good Luck

The car is a 2.0 NA with an automatic.

And if I burn something up, shame on me. You are after all, a random stranger on the internet just trying to help.

True I may not be good at electrical...yet... but I also used to not be good at mechanical and I just rebuilt my tsi ccta 2.0T engine in my 09 20k miles ago. I used whatever information I could find online. I like to think of it as aptitude with little experience. That might scare you but don't let it. If you explain it, ill get it done. I know there are others out there that can benefit from this thread. My girlfriend was tired of all of the issues with this car so she bought a Honda lol. She wants me to crush it ( IE She is pretty pissed) however I don't give up easily. If it goes to the crusher it will be under its own power.

Ive found a few diagrams online that Ive been studying. Right now Im just trying to rule out connections, fuses, relays etc...
 
   #28  

rabbitpower

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I ordered a 2 volume Bentley manual today. As soon as it arrives I'll see what kind of trouble I can get into.

Thank you to everyone that's chimed in so far
 
   #29  

Jack@European_Parts

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   #30  

rabbitpower

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Anyone that is looking for a good deal on mk4 manuals, amazon has 2 volume hardcover mk4 for about $100. They are split into mechanical and body electrical.

So Ive cleaned up the grounds under the battery, checked S179 power feed from the battery, has 12V.

* Purchased a tone generator per Jacks suggestion
* Purchased a better meter
* Took notes per suggestions in previous posts will try to verify condition at ecm plug. Can seem to find a schematic of which pins are where on the ecm plug. Ill do more digging so I know what I'm checking.

* Fuse 37 has power
* Relay 100 ( load reduction) is working.
* Fuel pump is energized and working
* No power at ecm relay 409. This is coming from somewhere upstream.

The fuses I mentioned earlier, according to the manual only receive momentary power when the ignition is switched on. They fail to do so. Is it possible that the ignition switch has failed yet will still allow the engine to crank? Looking at the print there are several configurations depending on year.

Before all of this happened the car would sometimes stall. Never once it was warmed up, usually on cold start. I don't know if this is part of the issue or another one. I cant plug in VCDS until I get power to the ecm.

Thanks for your patience. This is definitely a learning experience.
 
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   #31  

Jack@European_Parts

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Is it possible that the ignition switch has failed yet will still allow the engine to crank?

IT'S A POSSIBILITY!

Most of the time things hide in plain site!

 
   #32  

rabbitpower

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IT'S A POSSIBILITY!

Most of the time things hide in plain site!


Ok, when I get that far I will see what is suppose to get powered up from the key switch.

Is it worth checking the ECM connections if ECM relay 409 is not receiving power or should I would backwards from the 409 and see what turns up? I just want to make sure I'm not wasting anyone's time.
 
   #34  

rabbitpower

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RTFB the WD and trace the circuit!

Do you have ERWIN & printed to PDF yet?

I have the 700 page Bentley electrical book. I need to have the book right in front of me if I'm going to do this lol
 
   #35  

Jack@European_Parts

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Do it , I know you can..........

[video]https://y.yarn.co/f2267bef-2dc4-4f6c-b662-98d7a8662e0e.mp4?1552932775444[/video]
 
   #36  

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That cartoon was funny piece..lol Jack
 
   #37  

rabbitpower

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The car is running. I started at the ignition switch and found no power output from ( terminal 15?) I believe. I unplugged the connector and when i plugged it back in I suddenly had power to relay 409 and the car started. I'm going to study the ignition switch a bit more, but I'm fairly sure there is a short inside it somewhere. Had this been a more intermittent problem it would have been a nightmare to diagnose.
 
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