Operation CHARM: Car repair manuals for everyone.
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 spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

ECT

Scan Tool Range -40°C to 120°C (-40°F to 250°F). The ECT sensor is a thermistor that changes internal resistance as temperature changes. The PCM monitors a high signal voltage when the sensor is cold (internal resistance high) and interprets that voltage as a cold engine. The voltage signal decreases as the sensor becomes warm (internal resistance decreases) and the PCM interprets the lower voltage as a warm engine.