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06-28-2020, 08:16 PM
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#1 |
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Senior Member
 
Join Date: Feb 2014
Location: new smyrna beach fl / 29 palms cal
Posts: 1,727
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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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Hand made A/C vent manifolds for 64-66 trucks adapts any aftermarket A/C to OEM vent |
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06-28-2020, 09:09 PM
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#2 | |
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Senior Member
 Join Date: Jul 2009
Location: Athens, AL
Posts: 499
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Re: Voltage from pin 57
Quote:
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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06-29-2020, 09:08 AM
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#3 |
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Senior Member
Join Date: Feb 2014
Location: new smyrna beach fl / 29 palms cal
Posts: 1,727
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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
__________________
Hand made A/C vent manifolds for 64-66 trucks adapts any aftermarket A/C to OEM vent |
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