P2401

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E: Evaporative Emission System Leak Detection Reference Orifice Low Flow

DTC P043E - Evaporative Emission System Leak Detection Reference Orifice Low Flow

DTC P043F - Evaporative Emission System Reference Orifice High Flow

DTC P2401 - Evaporative Emission Leak Detection Pump Stuck OFF

DTC P2402 - Evaporative Emission Leak Detection Pump Stuck ON

DTC P2419 - Evaporative Emission Pressure Switching Valve Stuck ON

DTC SUMMARY

HINT: The reference orifice is located inside the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP System EVAP System.

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned OFF, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.
HINT: *: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned OFF, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned OFF, the monitor check starts 2.5 hours later.

HINT: *: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the EVAP pressure is between 724 to 752 mmHg* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM will illuminate the MIL and set DTC if this malfunction is detected in consecutive drive cycles.
*: Typical value.