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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0441: EVAP Control System - Incorrect Purge Flow >> DTC Confirmation Test (Using Generic Scan Tool)
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DTC Confirmation Test (Using Generic Scan Tool)

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 (TCS switch in OFF position) and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
  2. Start engine and wait at least 70 seconds. Backprobbing at ECM, measure and record voltage between ground and EVAP-CSPS signal circuit at ECM terminal No. 84 (Blue/Green wire). See Figure and Figure . Record voltage reading at idle.
  3. While monitoring voltage, maintain the following conditions for at least one minute:
    • A/C switch: ON position
    • Headlight switch: ON position
    • Rear window defogger switch: ON position
    • Engine speed: about 3000 RPM
    • Transmission: any forward gear

    Voltage should remain .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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