Ошибка P0117: низкий сигнал датчика температуры ОЖ (ДТОЖ)

The engine coolant temperature sensor 1 is an NTC thermistor: the control module feeds 5 V through a resistor, and as the coolant warms the resistance and signal voltage fall. Its value drives cold-start enrichment, idle speed, ignition timing, the radiator fan and the release of closed-loop mixture control. Some Ford engines measure cylinder head temperature instead and calculate a coolant value from it. P0117 means the signal voltage is too low, so the sensor would report an implausibly hot engine (around 140–160 °C). Usual causes are a signal wire shorted to ground, coolant or moisture in the connector, or an internally shorted sensor. Limits: GM below 55 ohms, Ford petrol below 0.244 V for 5 s, Ford diesel below 0.10 V, Mitsubishi below 0.1 V for 2 s. Mitsubishi then calculates with 80 °C; GM/Saab switch the radiator fan on and the A/C compressor off. GM needs two trips. On Ford engines with a head temperature sensor the equivalent is P1290.