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

Fuel Rail Temperature Sensor

FUEL RAIL TEMPERATURE SENSOR
The Fuel Rail Temperature (FRT) sensor is integral to the Compuvalve. The FRT is used to calculate fuel density. It is supplied five volts from the Compuvalve and as the temperature of the sensing element increases, its resistance increases.