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[Solved] vw golf 3 TDI 1Z - where there is a 50 A fuse and does not start

robertrocky 21330 12
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  • #1 16645729
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    Hello, I have a question where in golf 3 tdi engine 1 Z there is a fuse from 50 A shafts

    Anyone else has a schematic connecting the installation from the battery through the fuse 50 a, relay to the controller

    because there was a power outage somewhere

    and maybe some of those in the picture above the transmitters

    there is no 109 relay on the picture

    vw golf 3 TDI 1Z - where there is a 50 A fuse and does not start
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    #2 16645854
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    Hello, it should be in the engine compartment closer to the right side looking from the front on the bulkhead if there is not the 50A on the right in the picture.
  • #3 16645898
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    in the engine compartment is in such a box with a transparent lid and here too is a fuse 50 ai I do not know which is which and from what
    Added after 3 [minutes]:
    and because the matter is of the kind that I do not want to ignite it seemed to me eto of the relay 109 so-called cold February but soldering is ok not long ago improved and it was ok now I'm checking and everything is holding only from the stench burns the relay so I put a new one and still do not smoke , the indicator lamp does not shine and so combines whether it is connected to the controller only I do not know where the fuse is placed after the train, etc.
  • Helpful post
    #4 16645928
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    So this is the one in this box check if it did not ash because it does not seem to be good once and if you touch it, it crumbles.
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  • #5 16645930
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    ok check in the morning and give it to you
    or maybe a colleague knows what could happen if he does not smoke? :(
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    #6 16645941
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    But what does not even want to smoke, even if you do it a little longer?
  • #7 16645961
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    well, the starter makes you crazy, but the engine does not ignite

    and the candle lamp does not shine, maybe it's glowing
    Added after 11 [hours] 27 [minutes]:
    Hello this morning I went to work at the beginning I checked this fuse 50 A in a box with a transparent flap near the reservoir on the water if the liquid is ok I pulled it clean and almost nówka art
    then I drank as a colleague advised me for a short time (I gave him a +) solenoid valve on the pump and lit it right away. That is, this solenoid valve responsible for extinguishing the motor is for replacement or cleaning.

    I still have a question such as how I drank this solenoid valve, it was so ticked and the sound like the candles would come on, which means I think it should be.
    But after turning the key, he did not light up the control from the candles only until he lit it for a moment, and now I have a question, is this the correct symptom?

    In general, thank you for advise colleague sulof1601 without your advice, I think the dumb could swell from thinking
    and I still have a question whether it was that before I rode I noticed such a symptom with sometimes when crossing 120 km / h as if the strength was missing or could it be a symptom of falling of this solenoid valve or is it another reason?

    I also have a reason that sometimes after moving to 1 when it reaches 1,200 revolutions, as if it was cutting, but the car only travels from 1200 rpm. in the 2nd gear, a similar case but how did I release the gas pedal and I pressed again, is it something with a gas pedal sensor
    Added after 3 [hours] 14 [minutes]:
    Oh, I forgot to add that after firing I plugged in the computer and the VCDS showed such errors
    vw golf 3 TDI 1Z - where there is a 50 A fuse and does not start

    blocks show
    vw golf 3 TDI 1Z - where there is a 50 A fuse and does not start
  • #8 16659319
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    Returning to the topic, I replaced the fuse box but it did not give anything so I'm looking further

    on valve n 109 there is no current from what is known the cable from this valve flies on the controller only which pin in the plug
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  • #9 16659717
    Pawel wawa
    VIP Meritorious for electroda.pl  
    Posts: 16093
    Help: 1262
    Rate: 4416
    The box is replaced but the relays are probably old. Search for where you get the power supply, starting from the ignition, probably black wire. And check with a light bulb, not a meter.
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  • #10 16660231
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    The relays are mostly new.

    And the black one from the ignition is flying to the mailbox?
  • #11 16660312
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    The current on the shut-off valve goes from pin 53 of the engine controller. The errors that have occurred are related to the fact that I have not added privar on how to power this valve. The ignition should be switched on for a short time. I will add that turning on the glow plugs is giving the mass on the pin relay 50 engine driver.
  • #12 16663039
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    For those interested in the post, he writes that the reason for not firing was the ECU controller and for the advise of my friend sulof1601 I ran a short installation and the car is burning. I will be looking for an ECU driver calmly

    And this is the ECU bosch 028 906 021 FB driver
  • #13 19133663
    robertrocky
    Level 9  
    Posts: 53
    Rate: 31
    The problem was a module from the alarm cold soldering
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Topic summary

✨ The discussion revolves around a VW Golf 3 TDI 1Z that is experiencing starting issues, specifically related to a 50 A fuse and the absence of a relay 109. Users suggest that the 50 A fuse is located in a box in the engine compartment, near the right side. The original poster checks the fuse and finds it intact but continues to face problems with the engine not starting, despite the starter functioning. Further investigation reveals that the solenoid valve on the pump may need replacement or cleaning, as it was found to be malfunctioning. Ultimately, it is determined that the issue was related to the ECU controller, which was resolved by running a short installation, allowing the car to start. The ECU model identified is Bosch 028 906 021 FB.
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FAQ

TL;DR: On the Golf 3 TDI 1Z, a 50 A main fuse sits in a transparent‑lid box; “The current on the shut‑off valve goes from pin 53.” Fix no‑start by verifying that feed and the N109 solenoid. [Elektroda, sulof1601, post #16660312]

Why it matters: This FAQ helps DIYers quickly locate the 50 A fuse, test N109 power, and resolve crank‑no‑start without parts roulette.

Quick Facts

Where is the 50 A fuse on a VW Golf 3 TDI 1Z?

It’s in the engine compartment, toward the right side when facing the car. Look on the bulkhead area. You’ll typically find it inside a small holder in that zone. If the holder looks heat‑stressed or crumbly, replace it. A degraded holder can cause intermittent power loss to the engine electronics and no‑start symptoms. [Elektroda, sulof1601, post #16645854]

Which box has that 50 A fuse with the clear cover?

Check the box with a transparent lid near the coolant reservoir in the engine bay. The 50 A fuse sits inside. Pull and inspect the blade for corrosion, pitting, or cracks. Replace any overheated plastic holders to restore reliable contact under load. This location matches what the owner confirmed while troubleshooting a no‑start. [Elektroda, robertrocky, post #16645898]

My Golf 3 TDI cranks but won’t start and the glow plug light stays off. What should I check first?

Verify the 50 A fuse and power to the N109 fuel shut‑off solenoid. If the glow plug lamp stays off, the ECU or its feed may be missing. In the thread, powering N109 directly enabled an instant start, pointing to a supply path issue rather than mechanical failure. Inspect the relay feed path and related wiring. [Elektroda, robertrocky, post #16645961]

How do I quickly test the N109 fuel shut‑off solenoid?

Use this 3‑step check: 1. With ignition ON, apply 12 V briefly to N109’s terminal. 2. Listen for a click and attempt a start. 3. If it starts, trace the missing feed back to the ECU and relay. This confirms the solenoid and pump can enable fueling when powered. “It lit right away” after a short feed in the case discussed. [Elektroda, robertrocky, post #16645961]

Which ECU pin powers N109 on the 1Z engine?

The N109 shut‑off valve receives its feed from pin 53 of the engine control unit. If N109 lacks voltage with ignition ON, check continuity from pin 53 to the valve and verify the ECU’s power and grounds. “The current on the shut‑off valve goes from pin 53.” [Elektroda, sulof1601, post #16660312]

What is Relay 109, and did replacing it fix this case?

Relay 109 is commonly known as the ECU power relay on older TDIs. In this thread, the owner suspected it and even tried a replacement, but the engine still would not start. That pointed away from Relay 109 as the root cause here and toward a feed interruption elsewhere. [Elektroda, robertrocky, post #16645898]

Should I probe power feeds with a multimeter or a test lamp?

Use a 12 V test lamp for load‑testing low‑tension feeds in this circuit. A test lamp reveals high‑resistance faults that a high‑impedance meter might miss. “Check with a light bulb, not a meter,” advised an experienced participant while tracing the ignition feed path. [Elektroda, Pawel wawa, post #16659717]

Why did applying power to N109 make the glow plug system click afterward?

When you restore N109’s feed, the ECU can wake up, which brings normal pre‑glow behavior back online. The owner reported a ticking sound and glow behavior returning once N109 had power, and the engine started immediately. This indicates the ECU regained control logic after the temporary feed. [Elektroda, robertrocky, post #16645961]

I get occasional power loss around 120 km/h. Could N109 be related?

The thread mentions power loss near 120 km/h and hesitation near 1,200 rpm, but no confirmed link to N109 was found there. Treat it as a separate diagnosis unless you also confirm intermittent N109 feed. Document the speeds and RPMs precisely during testing. 120 km/h was the reported threshold. [Elektroda, robertrocky, post #16645961]

What ultimately caused the no‑start in this specific case?

The final fix, posted later by the owner, was repairing a cold solder joint in an aftermarket alarm module. This fault interrupted critical feeds and mimicked ECU or relay failures. After correcting the soldering on the alarm module, the no‑start condition resolved. [Elektroda, robertrocky, post #19133663]

Is the ECU itself a common failure here, and what part number was used?

The owner initially bypassed feeds and the car started, leading to an ECU swap plan. He referenced Bosch ECU 028 906 021 FB for the 1Z. However, the later update showed the ECU was not the root cause in that vehicle. Always confirm feeds and modules first. [Elektroda, robertrocky, post #16663039]

How do I trace ignition‑to‑ECU power for a no‑start?

Start at the ignition switch’s black wire, then follow the path to the relay/fuse panel and ECU. Load‑test each segment with a test lamp to reveal any dropouts. This approach isolated the missing feed path in the discussed case and avoids chasing healthy components. [Elektroda, Pawel wawa, post #16659717]
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