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Engine control unit (ECU )does not power on? I need the ECU wiring diagrams

Tiny
ANDRIN ATEM
  • MEMBER
  • 2013 CHEVROLET TRAVERSE
  • 3.8L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 16,789 MILES
Please can I have the power and ground input to the ECU. The ECU fuse keeps blowing each time I cycle the key to ACC position. I need the ECU diagram for power and ground which are responsible for powering the ECU.
Thursday, June 15th, 2023 AT 4:13 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,640 POSTS
I have seen a shorted ignition coil; fuel injector or oxygen sensor cause this problem FYI. Here is a guide to help you check the wiring and I have included the PCM and engine wiring diagrams so you can run the test and see how the system works.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Friday, June 16th, 2023 AT 9:10 AM
Tiny
ANDRIN ATEM
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  • 250 POSTS
Thank you, my friend. I disconnected all the injectors connectors, ignition coil connectors, airflow etc, and now the short circuit which keeps blowing off the ECU fuse 15amps, has been fixed, but I still notice that my ECU is not powered on, no check engine on dash. After my check comes in, I will then move to identify which part was blowing of the ECU fuse. Please if any help more I will appreciate.
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Monday, June 19th, 2023 AT 4:10 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Actually, if I had just directly the ground and power diagram input of the ECU, it’s easy for me to work my way around.
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Monday, June 19th, 2023 AT 4:13 PM
Tiny
KEN L
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Can I ask what fixed the fuse blowing problem? What info do you need to help?
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Tuesday, June 20th, 2023 AT 3:35 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
That’s a good question you have asked, I will reply once I begin to plug each part I disconnected. When I get to the part which was shorted, I will expect the fuse to blow up. But I pull out all the connectors of the injectors, ignition coils, 02 sensors. I need just the ground and power input to the ECU.
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Tuesday, June 20th, 2023 AT 10:37 PM
Tiny
KEN L
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No problem they are in the PCM wiring diagrams above.
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Wednesday, June 21st, 2023 AT 11:04 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
My friend Ken, please check well and see if it’s diagram for the ecu I am referring to. Let me send you an image of the ECU and its connectors. I have taken a good look and the exam diagram, not very sure it is for my PCM.
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Thursday, June 22nd, 2023 AT 12:38 AM
Tiny
KEN L
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Yep, those are the correct wiring diagrams I double checked. I do see a tiny bit of corrosion on a couple of the terminals on the PCM though which can cause the issue. Can you double check the power and grounds? Also, I would check the sensor wires to see if one is melted to ground.
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Friday, June 23rd, 2023 AT 10:14 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 250 POSTS
Thank you, I appreciate Ken for your time in replying. Respect!
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Friday, June 23rd, 2023 AT 3:56 PM
Tiny
KEN L
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Anytime!
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Saturday, June 24th, 2023 AT 11:11 AM

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