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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5 >> Diagnostic Tests >> DTC P0441: EVAP Control System Incorrect Purge Flow >> DTC Confirmation Test
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DTC Confirmation Test

NOTE: If DTC confirmation test has been previously performed, turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.
NOTE: For best results, perform test at a temperature of 32°F (0°C) or more.
NOTE: Use the following test to check overall function of EVAP control system purge flow monitoring. During this test, 1st trip DTC may not be confirmed.
  1. Raise drive wheels. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
  2. Start engine and wait at least 70 seconds. Measure and record voltage between ground and ECM terminal No. 88 (Black/Red wire) (EVAP-CSPS signal circuit) by backprobing. See Figure and Figure .
  3. While monitoring voltage, maintain the following conditions for at least one minute:
    • A/C switch in ON position.
    • Steering wheel is fully turned.
    • Headlight switch in ON position.
    • Rear window defogger switch in ON position.
    • Engine speed at about 3000 RPM.
    • Transmission in any forward gear.

    Voltage should remain 0.1 volt less than voltage measured at idle for at least one second.

  4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to .DIAGNOSTIC PROCEDURE 
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