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

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

KEN L

MASTER CERTIFIED MECHANIC
48,363 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

ANDRIN ATEM

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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

ANDRIN ATEM

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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

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

ANDRIN ATEM

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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

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

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

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

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

ANDRIN ATEM