 DTC DETECTION LOGIC
DTC No.
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Trouble diagnosis name
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DTC detecting condition
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Possible cause
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P0448
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EVAP canister vent control valve close
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EVAP canister vent control valve remains closed under specified driving conditions.
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- EVAP canister vent control valve
- EVAP control system pressure sensor and the circuit
- Blocked rubber tube to EVAP canister vent control valve
- EVAP canister is saturated with water
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 DTC CONFIRMATION PROCEDURE
 1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. - Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
>>GO TO 2.
 2.PERFORM DTC CONFIRMATION PROCEDURE
- Turn ignition switch ON and wait at least 5 seconds.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
- Start engine and let it idle for at least 1 minute.
- Repeat next procedures three times.
- Increase the engine speed up to between 3,000 and 3,500 rpm maintain that speed it for 2 minutes and 50 seconds to 3 minutes.Never exceed 3 minutes.
- Fully released accelerator pedal and keep engine idle for about 5 seconds.
- Repeat next procedure 20 times.
- Quickly increase the engine speed up to between 4,000 and 4,500 rpm and maintain that speed it for 25 to 30 seconds.
- Fully released accelerator pedal and keep engine idle for at least 35 seconds.

- Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>Go to Diagnosis Procedure (GT-R certified NISSAN dealer). NO >>INSPECTION END
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