2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK INTAKE SYSTEM 

    CHECK THE FOLLOWING FOR CONNECTION.

    • Air duct
    • Vacuum hoses

    OK OR NG 

    1. OK: GO TO 2.
    2. NG: Reconnect the parts.
  2. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch off.
    2. Loosen and retighten engine ground screws. See Figure .
    1. : GO TO 3.
  3. CHECK MAF SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect mass air flow (MAF) sensor harness connector.
      Fig 1: Disconnecting Mass Air Flow Sensor Harness Connector
      G00787029Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch on.
    3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.
      Fig 2: Checking Voltage Between MAF Sensor Terminals 2, 4 And Ground
      G00787030Courtesy of NISSAN MOTOR CO., U.S.A.

    OK OR NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E15, F18
    • Harness for open or short between ECM relay and mass air flow sensor
    • Harness for open or short between mass air flow sensor and ECM
    1. : Repair harness or connectors.
  5. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. check harness continuity between MAF sensor terminal 3 and ECM terminal 80.

      Refer to wiring diagram.

      Continuity should exist. 

    4. Also check harness for short to power.

    OK OR NG 

    1. OK: GO TO 6.
    2. NG: Repair open circuit or short to power in harness or connectors.
  6. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between MAF sensor terminal 1 and ECM terminal 62.

      Refer to wiring diagram.

      Continuity should exist. 

    2. Also check harness for short to ground and short to power.

    OK OR NG 

    1. OK: GO TO 7.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK MASS AIR FLOW SENSOR 
    1. Reconnect harness connectors disconnected.
    2. Start engine and warm it up to normal operating temperature.
    3. Check voltage between ECM terminal 62 (mass air flow sensor signal) and ground.
      Fig 3: Check Voltage Between ECM & Ground
      G00787031Courtesy of NISSAN MOTOR CO., U.S.A.
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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