SFI SYSTEM Active Control Engine Mount System

DESCRIPTION

LOCATION
A017EEXE04

The active control engine mount system decreases engine vibration at low engine speed using the duty vacuum switching valve for active control engine mount. The duty vacuum switching valve for active control engine mount is controlled by a pulse signal transmitted to the duty vacuum switching valve for active control engine mount from the ECM. The frequency of this pulse signal is matched to the engine speed to decrease engine vibration.

WIRING DIAGRAM

A017BXVE06

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK VACUUM HOSES


    1. A017FJ6E01
      Text in Illustration
      *1 Engine
      *2 Duty Vacuum Switching Valve
      *3 Front Engine Mounting Insulator Assembly
      *4 ECM
      *5 Air Cleaner
      *6 Vacuum Tank
      *7 to No. 3 Intake Air Control Valve Assembly

      If the hose is damaged, replace the vacuum hose assembly.

    2. Check the air and vacuum hoses for looseness, disconnection and blockage.


    NG

    REPAIR OR REPLACE VACUUM HOSES

    OK

  2. CHECK VACUUM


    1. A017F67

      Start the engine.

    2. Disconnect the vacuum hose from the vacuum tank on the air cleaner cap.

    3. Check that the disconnected port located on the vacuum tank applies suction to your finger.

      OK
      Vacuum exists.

    4. Reconnect the vacuum hose.


    NG

    CHECK AND REPLACE VACUUM SOURCE AND HOSES

    OK

  3. INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION)


    1. A017G1YE04

      Remove the duty vacuum switching valve for active control engine mount.

    2. Check operation of the duty vacuum switching valve when battery voltage is applied to the terminals of the duty vacuum switching valve connector.

      Battery voltage is not applied
      The air from pipe G flows out through pipes E and H.
      Battery voltage is applied
      The air from pipe F flows out through pipes E and H.

    3. Reinstall the duty vacuum switching valve for active control engine mount.


    NG

    REPLACE DUTY VACUUM SWITCHING VALVE Click here

    OK

  4. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)


    1. A017CCXE06
      Text in Illustration
      *a

      Component without harness connected

      (Duty Vacuum Switching Valve)

      Disconnect the duty vacuum switching valve for active control engine mount connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 19 to 21 Ω

    3. Reconnect the duty vacuum switching valve connector.


    NG

    REPLACE DUTY VACUUM SWITCHING VALVE Click here

    OK

  5. INSPECT FRONT ENGINE MOUNTING INSULATOR ASSEMBLY


    1. A017DCU

      Disconnect the vacuum hose from the front engine mounting insulator assembly.

    2. Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 23.622 in.Hg) and wait for 1 minute.

    3. Check that there is no change in the needle movement of the vacuum pump gauge.

    4. Check that there is no fluid leakage caused by a break in the diaphragm.

      OK
      Vacuum does not leak.

    5. Reconnect the vacuum hose.


    NG

    REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY Click here

    OK

  6. INSPECT DUTY VACUUM SWITCHING VALVE (POWER SOURCE VOLTAGE)


    1. A017DJIE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Duty Vacuum Switching Valve)

      Disconnect the duty vacuum switching valve for active control engine mount connector.

    2. Turn the ignition switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B8-1 - Body ground Ignition switch on (IG) 11 to 14 V

    4. Reconnect the duty vacuum switching valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - DUTY VACUUM SWITCHING VALVE)

    OK

  7. CHECK HARNESS AND CONNECTOR (DUTY VACUUM SWITCHING VALVE - ECM)


    1. Disconnect the duty vacuum switching valve for active control engine mount connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B8-2 - B47-9 (ACM) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B8-2 or B47-9 (ACM) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the duty vacuum switching valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DUTY VACUUM SWITCHING VALVE - ECM)

    OK

    REPLACE ECM Click here