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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 764 (Engine Control System - Component Testing) >> Electronic Controlled Engine Mount >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine and warm it up to normal operating temperature.
    2. Select "ENGINE MOUNTING" in "ACTIVE TEST" mode with CONSULT-II and touch "ON/OFF" on the CONSULT-II screen.
    3. Check that the motor operating sound is heard from front electronic controlled engine mount for about 0.5 seconds according to the switching condition of "ENGINE MOUNTING".
      Fig 1: CONSULT-II Display - ACTIVE TEST
      G04905841Courtesy of NISSAN NORTH AMERICA, INC.

    Without CONSULT-II 

    1. Make sure that gear position is P or N.
    2. Start engine and let it idle.
    3. Change the engine speed from idle to more than 1, 000 rpm and then return to idle (with vehicle stopped).
    4. Check that the motor operating sound is heard from front electronic controlled engine mount for about 0.5 seconds when changing engine speed.

      It is better to hear the operating sound around the left side front wheel house.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

  2. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect electronic controlled engine mount harness connector.
      Fig 2: Identifying Electronic Controlled Engine Mount Harness Connector
      G04905842Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check voltage between electronic controlled engine mount terminal 3 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

    Fig 3: Checking Voltage Between Electronic Controlled Engine Mount Terminal 3 And Ground
    G04905843Courtesy of NISSAN NORTH AMERICA, INC.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E8, F17
    • Fuse block (J/B) connector E30
    • 15A fuse
    • Harness for open and short between electronic controlled engine mount and battery

    : Repair harness or connectors.

  4. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminals and electronic engine mount terminals as follows. Refer to WIRING DIAGRAM .
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      ECM terminal Electronic controlled engine mount terminal
      8 1
      9 2

      Continuity should exist. 

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

    OK or NG 

    OK: GO TO 5.

    NG: Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK ELECTRONIC CONTROLLED ENGINE MOUNT 

    Visually check electronic controlled engine mount.

    OK or NG 

    OK: GO TO 6.

    NG: Replace electronic controlled engine mount.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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