560SL Temperature Sensor Test

[BabyBlueBenz]

In pursuit of eliminating potential contributors to my SL's high idle syndrome, I have been performing various tests on the components related to idle management, namely the Idle Speed Control Unit (ISCU) and its peripherals. In the course of testing the ISCU a second/thorough time around, I again found a fault with the "TF Signal" as input to the ISCU. This signal relates engine temperature information as it is relayed by the N3 CIS-E Control Unit. Since my ability to directly query the CIS-E is currently limited, I opted to attempt confirmation of the functionality of the sensor itself, which is known formally known as "B11/2 Coolant Temperature Sensor (EZL/CIS-E)". Here's what I found...