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Home >> Lexus >> 2007 >> LS 460 >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System) >> DTC P0453: EVAP Control System Pressure Sensor >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body. Refer to GROUND INSPECTION  .
      Fig 1: Checking Ground Connections
      G00775497Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK CONNECTOR 
    1. Disconnect EVAP control system pressure sensor harness connector.
      Fig 2: Disconnecting EVAP Control System Pressure Sensor Harness Connector
      G00775498Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check sensor harness connector for water.
      1. Water should not exist. 

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace harness connector.
  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-II or tester.
      1. Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
    Fig 3: Checking Voltage Between EVAP Terminal 3 And Ground
    G00775499Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B106, E138
    • Harness connectors E19, F33
    • Harness for open or short between EVAP control system pressure sensor and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect TCM harness connector.
    4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42.

      Refer to WIRING DIAGRAM  .

      1. Continuity should exist. 
    5. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  7 .
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness connectors B106, E138
    • Harness for open or short between EVAP control system pressure sensor and ECM
    • Harness for open or short between EVAP control system pressure sensor and TCM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

      Refer to WIRING DIAGRAM  .

      1. Continuity should exist. 
    2. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  9 .
    2. NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness connectors B106, E138
    • Harness for open or short between EVAP control system pressure sensor and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK RUBBER TUBE FOR CLOGGING 
    1. Disconnect rubber tube connected to EVAP canister vent control valve.
    2. Check the rubber tube for clogging.

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Clean the rubber tube using an air blower.
  10. CHECK EVAP CANISTER VENT CONTROL VALVE 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Replace EVAP canister vent control valve.
  11. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 12.
    2. NG: Replace EVAP control system pressure sensor.
  12. CHECK RUBBER TUBE 

    Check obstructed rubber tube connected to EVAP canister vent control valve.

    OK or NG 

    1. OK: GO TO 13.
    2. NG: Clean rubber tube using an air blower, repair or replace rubber tube.
  13. CHECK WATER SEPARATOR 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 14.
    2. NG: Replace water separator.
  14. CHECK IF EVAP CANISTER SATURATED WITH WATER 
    1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
    2. Check if water will drain from the EVAP canister.

    Yes or No 

    1. Yes: GO TO 15.
    2. No: GO TO  17 .
    Fig 4: Checking Water Will Drain From EVAP Canister
    G00775500Courtesy of NISSAN MOTOR CO., U.S.A.
  15. CHECK EVAP CANISTER 

    Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

    The weight should be less than 2.1 kg (4.6 Ib). 

    OK or NG 

    1. OK: GO TO  17 .
    2. NG: GO TO 16.
  16. DETECT MALFUNCTIONING PART 

    Check the following.

    • EVAP canister for damage
    • EVAP hose between EVAP canister and water separator for clogging or poor connection
      1. Repair hose or replace EVAP canister.
  17. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. INSPECTION END 
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