P2419

DTC P2419 EVAPORATE EMISSION SYSTEM SWITCHING VALVE CONTROL CIRCUIT LOW

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.

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

Step 10:

Step 11:

Step 12 - 13:

Step 14 - 15:

Step 16 - 17:

Step 18 - 19:

Step 20:

Step 21 - 22:

Step 23:

Step 24 - 26:

Step 27 - 29:

Step 30 - 35:

Step 36:

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.

P2419: Vent valve stuck ON




In operation B, the vacuum pump creates negative pressure (a vacuum) through the 0.02 inch orifice. The EVAP (Evaporative Emission) system pressure is then measured by the ECM, using the pressure sensor, to determine the 0.02 inch leak pressure standard. If the pressure exceeds -1.2 kPa (-9.0 mmHg)* 4 seconds after the vacuum pump is turned ON, the ECM interprets this as the vent valve being stuck ON. The ECM illuminates the MIL and sets the DTC.

*: The threshold varies according to the atmospheric pressure measured in operation A. The value described above is based on an atmospheric pressure of 100 kPa (750.1 mmHg): absolute pressure.

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Monitor Result (Mode 06 Data):

OBD II MONITOR SPECIFICATIONS