S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Fuel Tank Pressure Sensor: Description and Operation
Fuel Tank Pressure Sensor - 2
Fuel Tank Pressure Sensor
The EVAP system uses a fuel tank pressure sensor, located on top of the fuel tank sender unit, in order to detect when the EVAP system is purging. The
fuel tank pressure sensor detects the flow from the engine through the EVAP canister purge solenoid valve. When the EVAP system is not purging, the
fuel tank pressure sensor will detect no change in fuel tank vacuum. When the EVAP system is purging, the fuel tank pressure sensor will detect a
vacuum in the fuel tank. A change in fuel tank pressure will be displayed on the scar tool.
If any of the following EVAP malfunctions are present:
^
Leak
^
Plug
^
Malfunctioning fuel tank pressure sensor
One of the following DTCs will set:
^
P0440
^
P0442
^
P0446
^
P0452
