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I call my Rm8T's 96 Jetta Hitler and have done so for years... I call my Subaru GL10 Hirohito ........so the title is explained.
recently had it throw Coolant temp out of range with O2 sensor back during the Texas Freeze... cleared code and all good until a week ago when I got Code Coolant Temp sensor LOW
now it's coolant temp sensor low constantly ... temp reading is 136 C with warmed up engine .. then when you start the vehicle the temp goes to 56C
I measured the resistance of the sender and the ECT readings are 245 ohms on the ECM side and 478 ohms on the gauge side... so I figure the sender is in fact out of range... ordered new sender from Rock Auto and will report back after I change it... the only other issue could be the Engine ECM as the wires from the sender to the ECM show continuity.
I would think both the Gauge side and the ECM side of the sensor should read about the same under the same conditions (the gauge reads fine) sure is weird to see that Temp drop when monitoring Data with my Snap ON Brick when you start the vehicle.
FIXED.....the ECT Sensor is for sure defective... funny thing is the resistance values for both elements are GOOD and within range when you check it with Ohmmeter.
The actual Issue is, there is cross talk between the 2 resistive elements ... if you measure between 1-2 or 3-4 you see an Ohmic value when it should be Infinity with the sensor disconnected. So due to the cross talk I can understand why it reads right when the Vehicle is static and then sets code when running
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