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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Electronic Controlled Engine Mount >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK THE OVERALL FUNCTION 

    With CONSULT-II 

    1. After warming up engine, run it at idle speed.
    2. Shift selector lever to D range while depressing the brake pedal and pulling the parking brake control lever.
    3. Perform ENGINE MOUNTING in ACTIVE TEST mode with CONSULT-II and check that the body vibration changes according to switching the condition (With vehicle stopped).
      Fig 1: Display CONSULT-II ACTIVE TEST Screen
      G00787528Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. After warming up engine, run it at idle speed.
    2. Shift selector level to D range while depressing the brake pedal and pulling the parking brake control lever.
    3. Disconnect front or rear electronic controlled engine mount harness connector when engine speed is more than 1,000 rpm.
    4. When returning engine speed to idle speed, check that the body vibration increases, compared with the condition of the above step 2 (With vehicle stopped).

    OK or NG 

    1. OK: INSPECTION END
    2. NG: GO TO 2.
  2. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect front or rear electronic controlled engine mount harness connector.
    3. Check voltage between electronic controlled engine mount terminal 3 and ground with CONSULT-II or tester.
      Fig 2: Checking Voltage Between Electronic Controlled Engine Mount Terminal And Ground
      G00787529Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  4 .
    2. NG: GO TO 3.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E15, F18
    • 15A fuse
    • Joint connector-13
    • Harness for open or short between electronic controlled engine mount and battery
    1. : Repair harness or connectors.
  4. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 4 and electronic controlled engine mount terminal 1, ECM terminal 14 and electronic controlled engine mount 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 5.
    2. NG: Repair open circuit, short to ground or short to power in harness connectors.
  5. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT 

    Visually check front and rear electronic controlled engine mount.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Replace front or rear engine mount assembly.
  6. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END
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