Fuel Tank Pressure Sensor Circuit

Fuel Tank Pressure Sensor Circuit

High/Low Input Failure
These are continuous monitors. The voltage from the sensor is compared to a failure threshold defined in the software.

If the voltage is below the low threshold, then a timer starts to increment. Once this timer exceeds another threshold, then a failure flag is set and a DTC is stored. If the voltage is over the high threshold defined in the software, then a timer starts to increment. Once this timer exceeds a threshold, then a failure flag is set and a DTC is stored.

Range/Performance Failure
This monitor is covered in the EVAP loss recovery system monitor section.