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Toyota Sienna Service Manual: Evaporative Emission Control System Incorrect Purge Flow

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Evaporative Emission Control System Incorrect Purge Flow

DTC P0441 Evaporative Emission Control System Incorrect Purge Flow

DTC SUMMARY

DTC SUMMARY

DESCRIPTION

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

INSPECTION PROCEDURE

Refer to the EVAP System.

MONITOR DESCRIPTION

The two monitors, Key-Off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The Key-off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours*1 after the ignition switch is turned off. The purge flow monitor runs while the engine is running.

1. KEY-OFF MONITOR

5 hours*1 after the ignition switch is turned 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.

HINT: *1: If the engine coolant temperature is not below 35C (95F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35C (95F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

KEY-OFF MONITOR

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

KEY-OFF MONITOR

  1. Purge VSV stuck open
    In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The EVAP system pressure is then measured by the ECM using the pressure sensor. If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2], the ECM interprets this as the purge VSV (Vacuum Switching Valve) being stuck open.

    The ECM illuminates the MIL and sets the DTC (2 trip detection logic).

KEY-OFF MONITOR

  1. Purge VSV stuck closed
    In operation D, the pressure sensor measures the EVAP (Evaporative Emission) system pressure. The pressure measurement for purge VSV monitor is begun when the purge VSV is turned on (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa (2.25 mmHg) or more, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).

KEY-OFF MONITOR

2. PURGE FLOW MONITOR

PURGE FLOW MONITOR

The purge flow monitor consists of the two step monitors.

The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

Atmospheric pressure check: In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All:

TYPICAL ENABLING CONDITIONS

Purge flow:

TYPICAL ENABLING CONDITIONS

Purge VSV stuck open and closed:

TYPICAL ENABLING CONDITIONS

Key-off monitor sequence 1 to 8

1. Atmospheric pressure measurement

Key-off monitor sequence

2. First reference pressure measurement

Key-off monitor sequence

3. EVAP canister vent valve close stuck check

Key-off monitor sequence

4. Vacuum introduction

Key-off monitor sequence

5. EVAP canister purge valve close stuck check

Key-off monitor sequence

6. Second reference pressure measurement

Key-off monitor sequence

7. Leak check

Key-off monitor sequence

8. Atmospheric pressure measurement

Key-off monitor sequence

TYPICAL MALFUNCTION THRESHOLDS

Purge flow:

TYPICAL MALFUNCTION THRESHOLDS

EVAP VSV stuck open:

TYPICAL MALFUNCTION THRESHOLDS

EVAP VSV stuck closed:

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS

Evaporative Emission System
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Evaporative Emission Control System Pressure
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Other materials:

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Installation
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