Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the logical successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la
ECT
The scan tool range is
-40°C to
120°C (-40°F to
250°F). The ECT sensor is a thermistor which changes internal resistance as the temperature changes. When the sensor is cold (internal resistance high), the
PCM monitors a high signal voltage and interprets the voltage as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.