P2420

DTC P2420 EVAPORATE EMISSION SYSTEM SWITCHING VALVE CONTROL CIRCUIT HIGH

Malfunction Detection Conditions:

DTC SUMMARY

HINT: The vent valve is built into the pump module.







While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened by the ECM and stored fuel vapors in the canister are purged to the intake manifold. The ECM changes the duty cycle ratio of the purge VSV to control purge flow volume.

The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed into the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure (vacuum) is applied to the canister.

The following two monitors run to confirm appropriate EVAP system operation.

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INSPECTION PROCEDURE

MONITOR DESCRIPTION







5 hours after the ignition switch is turned to OFF, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

P2420: Vent valve stuck OFF




In operation C, the vent valve turns ON (closes) and the EVAP (Evaporative Emission) system pressure is then measured by the ECM, using the pressure sensor, to conduct an EVAP leak check. If the pressure does not increase by more than 0.3 kPa (2.25 mmHg) within 10 seconds of the vent valve being turned from OFF (vent) to ON, the ECM interprets this as the vent valve being stuck OFF. The ECM illuminates the MIL and sets the DTC.

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Monitor Result (Mode 06 Data):

OBD II MONITOR SPECIFICATIONS