P2402 2009 TOYOTA PRIUS - EVAP System Leak Detection Pump Control Circuit High
Tech notesThere is a factory service bulletin for the following Toyota models:
2005–2006 Toyota Corolla
2005–2006 Toyota Matrix
Toyota Corolla, Matrix Factory Service Bulletin OBDII Code P2401
Service bulletin recommends replacing the EVAP Charcoal Canister Assembly to repair the problem.
When is the code detected?To determine leak criterion (Reference pressure), vacuum pump creates negative pressure in canister pump module through 0.02 inch orifice and pressure is measured. If the conditions are not met, Engine Control Module (ECM) the code will be set.
P2402 2009 Toyota Prius Description5 hours after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The Engine Control Module (ECM) monitors for leaks and actuator malfunctions based on the EVAP pressure.
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