1996-Up Nissan Evap Vent Control Valve Diagnostics Service Bulletin

If an applied vehicle has one (or more) of the following DTCs stored in Self Diagnosis, use the Service Procedure below to check the operation of the EVAP vent control valve.
IMPORTANT NOTES:
• If DTC(s) other than the ones listed below are found stored in Self Diagnosis, the EVAP vent control valve is NOT the cause of the incident.
• If the EVAP vent control valve passes the tests outlined in the following Service Procedure, the cause of the incident is NOT the EVAP vent control valve.
SERVICE PROCEDURE
Perform the following checks (depending on the model year of the vehicle) to determine if the EVAP vent control valve needs to be replaced.
• If the EVAP vent control valve passes all of the following checks, the cause of the incident is NOT the EVAP vent control valve. Refer to the appropriate section of the service manual for the diagnostic procedure to resolve the incident. • If the EVAP vent control valve does not pass all of the following checks, perform repairs as necessary.
1996-97 Vehicles
1. Check the operation of the EVAP vent control valve using a 12VDC battery source as follows:
A. Apply battery voltage (see Figure 1) and look into the hose end of the valve to confirm the air passage closes (and seals).
NOTE: The valve must function (click) on the first application of battery voltage.
B. While looking into the hose end of the valve, disconnect the battery voltage and confirm the air passage re-opens fully and immediately (the valve should not stick closed).
C. Repeat steps A and B above to confirm the valve closes and re-opens consistently.
2. Confirm the sealing O-ring (for the valve) is: Correctly positioned and is not damaged (see Figure 1) Adequately lubricated with Texaco Canopus 13 mineral oil (P/N 999MP-AJ000)
3. Make sure the water separator and related hoses are not blocked by debris or insects. NOTE: If a Maxima, Truck or 240SX is not equipped with a water separator, refer to the following TSB(s) to install one.

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