ECT Sensor-manual transmission

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May 9, 2024 | 01:38 PM

wyoclint

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4wd Low

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ECT Sensor-manual transmission

Ive found quite a few threads addressing the second sensor, but am unable to find one that addresses my issue.
I had my engine rebuilt, and a new engine harness was needed. My truck is a manual 2003. The harness installed was for an automatic.
I have both sensors installed, but need to get the dash gauge reading.

Does anyone know the wire I need to tap into for the dash? I was going to splice the current power wire going to the existing ECT sensor, then run a wire back and tap into the harness where it would feed the dash gauge.

I could also use the pigtail PN if anyone has it.

Thanks!!!!

May 9, 2024 | 02:26 PM

Tpayne621

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If you still have the old harness you can use it to figure out which pins they go to on the big plug on driver side valve cover. Or pulled the pins out for it and reuse them. I'll see if I can find a wiring diagram for you either way.

May 9, 2024 | 02:30 PM

wyoclint

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Quote:

Originally Posted by Tpayne621

Thank you. I don't have the old harness.

May 9, 2024 | 02:35 PM

Tpayne621

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It ends up at pin 37 on pcm in the end. At the driver side valve cover big connector it's goes through pin 18.

May 9, 2024 | 08:13 PM

wyoclint

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So if I tie into 18 behind that harness plug on the valve cover that should get me what I need correct? Ill pull power from the existing ECT sensor and my other wire will go to the wire on 18.

Any chance you know the pigtail PN for the ECT sensor?

Thank you for all your help!!

May 9, 2024 | 10:04 PM

Tpayne621

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Quote:

Originally Posted by wyoclint

Lookng at the diagram the 2 coolant sensors are completely deoerste and do not connect. The other 2 coolant wire runs directly to the cluster.

Goning by the diragrams all the sensors returns share the same wire. The oil temp and ebp sensor are in same general location and they all share the same return. So you can splice one of them into one those then run the other to the back side of the valve cover plug on the pin 18 wire. Like you mentioned. It's the j in this Pic and you can see what all it's splice into there.

Im not 100% sure on pigtail but check it and see if it's the same as the other coolant denso pigtail. If so it will probably be easier to find that way.

May 18, 2024 | 03:59 PM

wyoclint

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I do NOT claim to be a wiring guru at all. On pin 18 on the engine harness side there is a red wire. Not sure whats up there. I am hoping to be able to figure this out, but I am not sure at this point. I got a new pigtail, so I dont know if I should splice into 18 behind the plug like I was talking about or not now (I assumed the engine side would not have wiring on it since its the automatic harness and I have a manual truck)