Note On Intermittents
Manipulate wiring, CTS connector, engine to dash connector and PCM connector, while observing PCM data ED04 or meter. If failure is induced, the data or meter will change from its current reading. When voltage increases and temperature parameter decreases, an open circuit is indicated. When voltage decreases and temperature parameter increases, a short to ground is indicated. If an intermittent cannot be found, substitute a known good sensor and retest.
Snapshot data captures coolant sensor value and other operating conditions at the time code was set. While it provides only one frame of data, an unexpectedly low value of ED04 from Code EO73 snapshot may indicate an open circuit or excessive resistance, while a high value indicates a short.