Crank no start No spark or injector pulse?

2007 VOLKSWAGEN JETTA
150,000 MILES • 2.5L • 5 CYL • 2WD • AUTOMATIC
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FREERIDER78
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No spark or injector pulse. No fuel pump prime. Prime relay clicks when key on and pump run relay clicks when cranking. No check engine light when key is on or when cranking. ECM relay has power at terminal 30 and ground at 87 when key is on. Fans cycle even though engine is cold. Are we looking at a bad ECM?
Mar 4, 2026 at 11:40 PM
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STRAILER
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Chances are the ECM is okay, I would use the video below to check the fuses listed in the images below and fi all fuses are okay I would replace the Motronic power relay, these go out and stop suppling power the PCM.

https://www.youtube.com/watch?v=G-xNK79Wa-w

Check out the images (below). Please let us know what happens.
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Mar 5, 2026 at 9:12 AM
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FREERIDER78
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Is that relay in the engine box or under the dash. There are two relays labeled 100 in the engine box. Constant power and ground when key is on. It also has power and ground out. I've swapped the 2 relays. Are these fuses inside or under the hood?
Mar 5, 2026 at 11:00 AM
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STRAILER
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These fuses and relays will be under the hood. Check those and get back to me. Also are there any codes, please go over this video to see.

https://www.youtube.com/watch?v=LBCpCWEFnTg

Please go over this guide and get back to us.
Mar 6, 2026 at 8:21 AM
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FREERIDER78
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I tracked down a broken wire that supplies power to pin 62, red w black stripe, of the main harness to the PCM. Will soldering this wire affect the resistance too greatly? How would you repair it?
Jul 6, 2026 at 5:41 AM
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STRAILER
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You have the right idea, solder the wire is the best way to fix it. Good find! Let me know if that fixes it. This video can show you how.

https://www.youtube.com/watch?v=4TjSYfLTHfg

Please let me know what happens.
Jul 6, 2026 at 2:07 PM
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FREERIDER78
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It definitely fixed the problem. There was actually some moisture inside the wrap of this harness. It's tucked in the cowling beneath the windshield in the engine compartment where it's exposed to rain and snow. I'll slice a piece of tubing so it isn't laying in water.
Jul 7, 2026 at 11:42 PM
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STRAILER
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Good find, and nice work.
Jul 8, 2026 at 1:10 AM
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