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02-06-2023, 01:58 PM
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#1 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: 1990 c3500 coolant temperature sensor wiring question
After looking at a few different schematics, it looks to me like the Square body trucks used terminal A11 for the coolant sensor ground, and the GMT400 used terminal D2.
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For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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02-06-2023, 02:06 PM
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#2 | |
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Registered User
Join Date: Apr 2014
Location: Houston Texas
Posts: 46
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Re: 1990 c3500 coolant temperature sensor wiring question
Quote:
So in theory if i can not find continuity with a meter on any wire on the engine side of the harness I can run the yellow and black wires directly to the corresponding pins in the ecm correct?
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F-Body Slut! Lol! |
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02-06-2023, 02:40 PM
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#3 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: 1990 c3500 coolant temperature sensor wiring question
Yes, running your own wires would be ok.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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02-06-2023, 02:49 PM
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#4 | |
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Registered User
Join Date: Apr 2014
Location: Houston Texas
Posts: 46
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Re: 1990 c3500 coolant temperature sensor wiring question
Quote:
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F-Body Slut! Lol! |
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02-06-2023, 02:57 PM
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#5 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: 1990 c3500 coolant temperature sensor wiring question
On that vehicle I am fairly sure it uses an ESC module and the knock sensor connects to it. I will go look at the schematic again to make sure this is so.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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02-06-2023, 03:05 PM
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#6 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: 1990 c3500 coolant temperature sensor wiring question
Yes that truck has an ESC (Electronic Spark Control) module that the knock sensor connects to. The ESC signal is sent to the ECM terminal B7
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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