Fuel temperature sensor (T199) not plausable
- Check the wiring harness / connector for the fuel temperature sensor (T199). - Check that the ambient temperature sensor gives a reasonable value - Check that coolant temperature sensor (T33) gives a reasonable value - Replace the fuel temperature sensor Warning: The fuel rail can still be pressurized with high pressure. Reduce pressure using SDP3 before work begins. Wear safety goggles. Risk that for burns when the safety valve is open.
What you'll see
No driver-visible symptom recorded.
System reaction
"Engine coolant temperature" is used instead as a replacement. The delivered engine power/torque will be less accurate.
Diagnostic depth
The temperature from the fuel temperature sensor (T199) is compared with the coolant temperature (T33). A fault is set when the temperatures differ too much. The diagnosis is only carried out when the coolant temperature and ambient temperature are similar, and before starting the engine
- Faulty wiring / connector to the sensor (T199) - Faulty sensor (T199) - Faulty coolant (T33) / ambient temperature sensors