This is the source of a P0118 coolant temp over voltage code in a Nissan Xterra. It is just in front of the right rear wheel, clipped to the top of the frame...right above the big rust hole in the muffler.
The cts is literally 18 inches from the ecu, and tested perfectly with a voltmeter back probed into the ecu connector. Problem was, the ecu always started from 40C, and the cluster thought it was -50 all the time.
Some months, that $200 I pay for Identifix is totally worth it. "Does the vehicle have an exhaust leak?" was a very useful sentence.
Some days it feels like I'm working for Dirk Gently. The RR wheel speed sensor codes were totally, fundamentally interconnected. Holistic, one could say.
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