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
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
PURPOSE During engine warm-up with coolant temperature below 150° F, the electrical impedance of the temperature sensor is high. The result is the ECM does not accept the
oxygen sensor voltage output and a fixed air/fuel mixture is maintained (Open Loop Mode of Operation).