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Old 11-23-2011, 05:01 PM   #1
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thermostat question

Does anyone know which wire from the thermostat sends the temperature to the ecu?

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Old 11-23-2011, 06:12 PM   #2
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The one on the thermostat housing. One wire is 5 volt reference the other is ground to the pcm. If you need exact I can check on my jeep.

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Old 11-23-2011, 06:30 PM   #3
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Well the reason I ask is im putting an obd2 motor in my obd1 jeep and keeping my ecu and wiring.. the obd2 ecu uses the thermostat information to send the temp to the gauge. However the odb1 uses a separate sensor that was removed in the obd2 head so I was considering splicing in to the thermostat for that sensor to feed the temp gauge.. I talked to a friend who said that will probably cause problems for the ecu though..
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Old 11-23-2011, 06:38 PM   #4
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I really don't think that will work because power goes in and grounds through the sensor based on the temperature. your best bet would be to drill and tap the thermostat housing and extend the temp sensor wire.
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Old 11-23-2011, 07:26 PM   #5
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Yeah splicing the temp gauge into either wire of the 2 wire sensor up front would throw off both the ecu and your temp gauge reading. Very possible you would even burn up the ecu. The suggestion to tap a hole in the stat housing is the way I would go. The only issue there is I think it's a pipe thread for those sensors, slightly tapered, not sure what size, or if it would leak if you used a standard tap. I would try it with some thread sealer, worst case scenario if you screw up, that housing is pretty cheap.
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Old 11-23-2011, 11:50 PM   #6
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Well the last option was going to be drill and tap the thermostat housing, what we ended up doing was pulling a PITA 5/16th square (female) plug out of the side of the block, getting a brass plumbing fitting, drilling it out, taping it with a 1/8ths tapered tap and screwing it all in.. it worked great! cant use thread sealer though because the sensor has to be grounded.. thanks for all the replies though guys! motor is almost ready to go in

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