P0452 TOYOTA EVAP System Pressure Sensor/Switch Low Input

Possible causes
– Faulty Evaporative Emission System (EVAP) Pressure sensor
– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted
– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection
Tech notes
There is factory service bulletin for the following Toyota models:

2003-2004 Toyota 4Runner
2003-2004 Toyota Tundra
2004 Toyota Camry
2004 Sienna
2004 Highlander
2004 Solara
Toyota Factory Service Bulletin OBDII Code P0452

When is the code detected?
An excessively low voltage from the sensor is sent to Engine Control Module (ECM).
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0452 TOYOTA Description
The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.
TOYOTA Technical Service Bulletins for P0452 code
2003 TOYOTA 4 RUNNER ENGINE AND ENGINE COOLING:ENGINE
2004 TOYOTA 4 RUNNER ENGINE AND ENGINE COOLING:ENGINE
2004 TOYOTA CAMRY ENGINE AND ENGINE COOLING:ENGINE
2004 TOYOTA CAMRY SOLARA ENGINE AND ENGINE COOLING:ENGINE
2004 TOYOTA HIGHLANDER ENGINE AND ENGINE COOLING:ENGINE
2004 TOYOTA SIENNA ENGINE AND ENGINE COOLING:ENGINE