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Old 06-28-2020, 08:16 PM   #1
nsb29
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Voltage from pin 57

E38 ECM and TCM from a 2008 avalanche at pin 57 I have 10v w/ key on and it fluctuates between 3.4 and 5.3 when running I thought it should be 5v all the time any help would be great
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Old 06-28-2020, 09:09 PM   #2
dayj1
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Re: Voltage from pin 57

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Originally Posted by nsb29 View Post
E38 ECM and TCM from a 2008 avalanche at pin 57 I have 10v w/ key on and it fluctuates between 3.4 and 5.3 when running I thought it should be 5v all the time any help would be great
Are you referring to pin 57 on ECM connector 1 or connector 2?

Pin 57 on connector 1 is the VSS signal which is a 12v square wave. If you measure it with a voltage meter, it isn't going to tell you much. But it will vary with speed.

Pin 57 on connector 2 is the Bank 1 upstream O2 sensor. It's an analog signal that will vary with the AFR. It's not going to tell you much to probe that with a voltage meter, either.
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Old 06-29-2020, 09:08 AM   #3
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Re: Voltage from pin 57

Pin 57 connector 1 being used for speedometer every thing was working fine and then became erratic and quite
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