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2001 GMC Sierra 4.8 liter. Wire harness was changed with a…

Customer Question
2001 GMC Sierra 4.8...

2001 GMC Sierra 4.8 liter. Wire harness was changed with a Chevy harness. Not sure if it’s the cause but I have no signal readings from both banks o2 sensor 1. Checked the power to heated sensors and they show power and ground. Sensors are brand new 3 times. Need to know if the pcm connector pin outs for o2 sensors are located differently.

Mechanic's Assistant: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?

And tested. All good

Mechanic's Assistant: Are you fixing your Sierra yourself? What have you tried so far?

Yes I am now. Friend put the harness in. Going over his work. If you read my first message it tells u what I checked

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Crank position sensor not learned yet. Three codes. Two sensors and crank

Submitted: 4 months ago.Category: Chevy
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Answered in 12 minutes by:
2/18/2018
Chevy Mechanic: Dan, Technician replied 4 months ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,963
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Verified

Hello, my name is ***** ***** I'm here to help get your problem solved. Give me a couple minutes to upload diagram for you, thanks.

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Chevy Mechanic: Dan, Technician replied 4 months ago

You can monitor voltage at oxygen sensors to make sure they are producing voltage, if so you can test wiring between PCM and oxygen sensors. If wiring is good and oxygen sensors are working then this would leave PCM as the problem. Here is the wiring diagram you were looking for. My goal is to provide 5 star service so please let me know if you need anything. Thanks.

-

https://www.dropbox.com/s/auhxp17v5btykxy/o2s.pdf?dl=0

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Customer reply replied 4 months ago
I got lost in this matrix and it tried to charge me twice.
Customer reply replied 4 months ago
I was told to pay 5 dollars and it charged me 28. WTH
Chevy Mechanic: Dan, Technician replied 4 months ago

$5 is the deposit and then you get charged the full amount once you receive a answer. I have nothing to do with advertising or charges though so please do not be upset with me and leave a negative rating.

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Chevy Mechanic: Dan, Technician replied 4 months ago

Would you like me to have refnd issued?

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Customer reply replied 4 months ago
I didn’t ask for whatu sent. I asked for a pin out on my pcm connectors
Chevy Mechanic: Dan, Technician replied 4 months ago

I can give you a pinout also, did you want to continue with service or have refund issued? Thanks.

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Customer reply replied 4 months ago
please refund thank u
Customer reply replied 4 months ago
Just refund. This isn’t going anywhere
Customer reply replied 4 months ago
I just got charged 28 and not happy
Customer reply replied 4 months ago
Refund.
Customer reply replied 4 months ago
Are u refunding me?
Customer reply replied 4 months ago
Hello?
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