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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0171 To P0463 >> DTC P0448: EVAP Canister Vent Control Valve >> Component Inspection
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Component Inspection

  1. CHECK EVAP CANISTER VENT CONTROL VALVE-I
    1. Turn ignition switch OFF.
    2. Remove EVAP canister vent control valve from EVAP canister. Refer to "EXPLODED VIEW ".
    3. Check portion (A) (view arrow) of EVAP canister vent control valve for being rusted.

      Is it rusted? 

      YES: Replace EVAP canister vent control valve. Refer to "EXPLODED VIEW ".

      NO: GO TO 2.

      Fig 1: Checking EVAP Canister Vent Control Valve-I
      G08255725Courtesy of NISSAN NORTH AMERICA, INC.
  2. CHECK EVAP CANISTER VENT CONTROL VALVE-II

    ◦ With CONSULT 

    1. Reconnect harness connectors disconnected.
    2. Turn ignition switch ON.
    3. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode of "ENGINE".
    4. Check air passage continuity and operation delay time.

      Make sure that new O-ring is installed properly  .

      Condition VENT CONT/V Air passage continuity between (A) and (B)
      ON Not existed
      OFF Existed

      Operation takes less than 1 second  .

    ⓧ Without CONSULT 

    1. Disconnect EVAP canister vent control valve harness connector.
    2. Check air passage continuity and operation delay time under the following conditions.

      Make sure that new O-ring is installed properly  .

      Fig 2: Checking Air Passage Continuity And Operation Delay Time
      G08255726Courtesy of NISSAN NORTH AMERICA, INC.
      Condition Air passage continuity between (A) and (B)
      12 V direct current supply between terminals 1 and 2 Not existed
      OFF Existed

      Operation takes less than 1 second  .

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: GO TO 3.

  3. CHECK EVAP CANISTER VENT CONTROL VALVE-III

    ◦ With CONSULT 

    1. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
    2. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode of "ENGINE".
    3. Check air passage continuity and operation delay time.

      Make sure that new O-ring is installed properly  .

      Condition VENT CONT/V Air passage continuity between (A) and (B)
      ON Not existed
      OFF Existed

      Operation takes less than 1 second  .

    ⓧ Without CONSULT 

    1. Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
    2. Check air passage continuity and operation delay time under the following conditions.

      Make sure that new O-ring is installed properly  .

      Fig 3: Checking Air Passage Continuity And Operation Delay Time
      G08255727Courtesy of NISSAN NORTH AMERICA, INC.
      Condition Air passage continuity between (A) and (B)
      12 V direct current supply between terminals 1 and 2 Not existed
      OFF Existed

      Operation takes less than 1 second  .

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace EVAP canister vent control valve. Refer to "EXPLODED VIEW ".