2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws. See Figure .
    1. : GO TO 2.
  2. CHECK CONNECTOR 
    1. Disconnect EVAP control system pressure sensor harness connector.
    2. Check sensor harness connector for water.

      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 1 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 1 And Ground
      G00786895Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 
    • Harness connectors B2, M2
    • Harness connectors M81, F49
    • Harness for open or short between EVAP control system pressure sensor and ECM
    1. : Repair harness or connectors.
  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between EVAP control system pressure sensor terminal 3 and engine ground.

      Refer to Wiring Diagram.

      Continuity should exist. 

    3. Also check harness for 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 B2, M2
    • Harness connectors M81, F49
    • Joint connector-20
    • Harness for open between EVAP control system pressure sensor and ECM
    • Harness for open between EVAP control system pressure sensor and TCM (Transmission Control Module)
    1. : Repair open circuit or short to power in harness or connectors.
  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 60 and EVAP control system pressure sensor terminal 2.

      Refer to Wiring Diagram.

      Continuity should exist. 

    3. 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 B2, M2
    • Harness connectors M81, F49
    • Harness for open or short between ECM and EVAP control system pressure sensor
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 
    1. Remove EVAP control system pressure sensor with its harness connector connected
      CAUTION: Never apply force to the air hole protector of the sensor if equipped. See Figure .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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