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90 B230FT Sensor in Crankcase ventilation hose- how to test/what is it for 700

posted by  ted on  Thu Mar 27 17:36 CST 2003
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last visit: Thu Oct 5 17:15 CST 2000
[RELATED]

It's a PTC (positive temperature coefficient) resistor. On the 1990 760 wiring diagram, it appears to be wired to the cold start injector. PTC resistors typically have little resistance at colder temps but rapidly build resistance at a pre-set warmer temp. My guess is that the PTC resistor is the mechanism that allows the cold start injector to operate at low temps by opening an electrical ground for the cold start signal.






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