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DTC Description
 
 
DTC DETECTION LOGIC
In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.
Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a malfunction is determined.
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
P044100EVAP PURG FLOW/MON
(EVAP system incorrect purge flow)
Diagnosis condition—
Signal (terminal)—
ThresholdEVAP control system does not operate properly, EVAP control system has a leak between intake manifold and EVAP control system pressure sensor
Diagnosis delay time—
 
 
POSSIBLE CAUSE
  • EVAP canister purge volume control solenoid valve stuck closed
  • EVAP control system pressure sensor and the circuit
  • Loose, disconnected or improper connection of rubber tube
  • Blocked rubber tube
  • Cracked EVAP canister
  • EVAP canister purge volume control solenoid valve circuit
  • Accelerator pedal position sensor
  • Blocked purge port
  • Blocked purge line
  • EVAP canister vent control valve
  • EVAP control system pressure sensor removed
 
 
FAIL-SAFE
Not applicable
 
 
DTC Confirmation Procedure
1.CHECK DTC PRIORITY
If DTC P0441 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Index.
.
 
2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
.
 
3.PERFORM COMPONENT FUNCTION CHECK
  1. Lift up drive wheels.
  2. Start engine (ASC switch OFF) and warm it up to normal operating temperature.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Start engine and wait at least 70 seconds.
  5. Set voltmeter probes to ECM harness connector terminals as per the following.
    ECM
    Connector+–
    Terminal
    E16129155
  6. Check EVAP control system pressure sensor value at idle speed and note it.
  7. Establish and maintain the following conditions for at least 1 minute.
    Air conditioner switchON
    Headlight switchON
    Rear window defogger switchON
    Engine speedApprox. 3,000 rpm
    Gear positionAny position other than P, N or R
  8. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (measured at step 6) for at least 1 second.
Is the inspection result normal?
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: INSPECTION END
Proceed to DTC Diagnosis Procedure.