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DTC P0441: Evaporative
Emission Control System Incorrect Purge Flow
TECHNICAL DESCRIPTION
- ECM detects a stuck open condition of evaporative emission
purge solenoid and a stuck closed condition of evaporative emission ventilation solenoid by
pressure change in fuel tank.
- Stuck open evaporative emission purge solenoid is judged through monitoring leak
of evaporative emission system.
- Stuck closed evaporative emission ventilation solenoid is judged after 20 seconds
from end of monitoring leak of evaporative emission system, or of usual operation of evaporative
emission purge solenoid from ON to OFF.
DESCRIPTIONS OF MONITOR METHODS
Fuel tank pressure decreases largely during purge-cut.
MONITOR EXECUTION
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
- Fuel tank pressure sensor monitor
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
- Engine is running.
- ON duty cycle of the evaporative emission purge solenoid is 0 percent.
- 20 seconds have elapsed since the duty cycle of the evaporative emission purge solenoid
has turned to 0 percent.
Judgement Criterion
- The pressure in the fuel tank is -1.96 kPa (-0.58 in.Hg) or less
for 0.1 second.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern
5 
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TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Evaporative emission purge solenoid failed.
- Evaporative emission ventilation solenoid failed.
- Fuel tank differential pressure sensor circuit related part(s) failed.
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Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
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STEP 1. Using scan tool MB991958, read the diagnostic trouble
code (DTC).
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To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"
(OFF) position before connecting or disconnecting scan tool MB991958.
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(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Read the DTC.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is DTC P0451 set?
 Refer to DTC P0451 - Evaporative Emission Control System Pressure Sensor
Range/Performance .
 Go to Step 2.
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STEP 2. Using scan tool MB991958, check data list item 52: Fuel Tank
Differential Pressure Sensor.
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(1)Turn the ignition switch to the "ON" position.
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(3)Set scan tool MB991958 to the data reading mode for item 52, Fuel Tank Differential
Pressure Sensor.
- The fuel tank differential pressures should be 1,500
and 3,500 mV.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the fuel tank pressure between 1,500 and 3,500 millivolts?
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Go to Step 3.
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Refer to DTC P0451 - Evaporative Emission Control System Pressure Sensor
Range/Performance .
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STEP 3. Using scan tool MB991958, check actuator test item 10: Evaporative
Emission Purge Solenoid.
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(1)Turn the ignition switch to the "ON" position.
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(2)Set scan tool MB991958 to the actuator test mode for item 10, Evaporative emission
purge solenoid.
- An operation sound should be heard and vibration should
be felt when the evaporative emission purge solenoid is operated.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the solenoid operating properly?
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Go to Step 4.
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Replace the evaporative emission purge solenoid. Then go to Step 5.
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STEP 4. Using scan tool MB991958, check actuator test item 15: Evaporative
Emission Ventilation Solenoid.
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(1)Turn the ignition switch to the "ON" position.
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(2)Set scan tool MB991958 to the actuator test mode for item 15, Evaporative emission
ventilation solenoid.
- An operation sound should be heard and vibration should
be felt when the evaporative emission ventilation solenoid is operated.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the solenoid operating properly?
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Repair or replace the vent hose and air filter. Then go to Step 5.
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Replace the evaporative emission ventilation solenoid. Then go to Step 5.
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STEP 5. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II
Drive Cycle - Pattern 5 .
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(2)Read the diagnostic trouble code.
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Retry the troubleshooting.
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The inspection is complete.
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