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Home >> Toyota >> 2005 >> Highlander Limited, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System (SFI) (3MZ-FE) - Diagnostics >> Active Control Engine Mount >> Inspection Procedure

Inspection Procedure

  1. CHECK VACUUM HOSES 
    1. Check if the vacuum hose cap is missing.
    2. If the hose is damaged, replace the vacuum hose assembly.
    3. Check the air and vacuum hoses for looseness, disconnection and blockage.
    Fig 1: Checking Vacuum Hoses
    G02611129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE VACUUM HOSES 
    2. OK: Go to next step 
  2. CHECK VACUUM 
    1. Start the engine.
    2. Disconnect the vacuum hose from the vacuum tank.
    3. Check that the unconnected port located on the vacuum tank applies suction to your finger.
    4. Reconnect the vacuum hose.
    Fig 2: Reconnecting Vacuum Hose
    G02611130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES 
    2. OK: Go to next step 
  3. INSPECT ECM (ACM VOLTAGE) 
    1. Connect the oscilloscope between terminals ACM and E1 of the E9 ECM connector.
    2. Warm up engine to normal operating temperature.
    3. Turn the A/C switch on.
    4. Measure the voltage between terminals ACM and E1 of the E9 ECM connector.
      Fig 3: Terminals ACM And E1 Wave Form
      G02611131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result: 

      TERMINALS ACM AND E1 OF E9 ECM CONNECTOR VOLTAGE SPECIFICATIONS

      Condition Voltage
      Shift position is D range, and engine speed is 850 RPM or less Pulse generation
      Shift position is D range, and engine speed is 950 RPM or more 9 to 14 V
      Shift position is P range 9 to 14 V
    1. OK: Go to step   6 
    2. NG: Go to next step 
  4. INSPECT VSV FOR ACM (RESISTANCE) 
    1. Disconnect the V5 VSV connector.
    2. Measure the resistance between the terminals 1 and 2.

      Standard: 19 to 21 Ω at 20°C (68°F) 

      Fig 4: Identifying V5 VSV Connector Terminals
      G02611132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE VSV 
    2. OK: Go to next step 
  5. CHECK WIRE HARNESS (VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY) 
    1. Check the wire harness between the VSV and ECM.
      1. Disconnect the V5 VSV connector for ACM.
      2. Disconnect the E9 ECM connector.
      3. Check the resistance of the wire harness side connectors.

      Standard: 

      VSV AND ECM CONNECTOR RESISTANCE SPECIFICATIONS

      Tester Connection Specified Condition
      V5-2 - E9-6 (ACM) Below 1 a
      V5-2 or E9-6 (ACM) - Body ground 10 kfl or higher
      Fig 5: Identifying VSV And ECM Connector Terminals
      G02611133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the wire harness between the VSV and EFI relay.
      1. Disconnect the V5 VSV connector.
      2. Remove the EFI relay from the engine room J/B.
      3. Check the resistance of the wire harness side connectors.
        Fig 6: Identifying VSV And EFI Relay Terminals
        G02611134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard: 

        VSV AND EFI RELAY TERMINALS RESISTANCE SPECIFICATIONS

        Tester Connection Specified Condition
        V5-1 (VSV for ACM) - J/B EFI relay terminal 3 Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE ECM (See  ECM (3MZ-FE)  ) 
  6. INSPECT VSV FOR ACM (OPERATION) 
    1. Remove the VSV.
    2. Check operation of the VSV when battery positive voltage is applied to the terminals of the VSV connector.

      OK: 

      Battery positive voltage is not applied: 

      The air from pipe G is flowing out through pipes E and H. 

      Battery positive voltage is applied: 

      The air from pipe F is flowing out through pipe's E and H. 

      Fig 7: Checking Operation Of VSV
      G02611135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE VSV FOR ACM 
    2. OK: Go to next step 
  7. INSPECT TRANSVERSE ENGINE, ENGINE MOUNTING INSULATOR 
    1. Disconnect the vacuum hose from the front engine mount insulator.
    2. Using MITYVAC (hand-held vacuum pump), apply a vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute.
    3. Make sure there is no needle movement on the MITY VAC.
    4. Check that there is no fluid leakage caused by a broken lower diaphragm.
      Fig 8: Inspecting Transverse Engine Mounting Insulator
      G02611136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE TRANSVERSE ENGINE, ENGINE MOUNTING INSULATOR 
    2. OK: SYSTEM OK 
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