Active Control Engine Mount System: Procedure

1. If the hose is damaged, replace the vacuum hose assembly.
   Fig 1: Engine, Vacuum Switching Valve For Active Control Engine Mount, Engine Mounting Insulator & ECM

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

   *1	Engine
   *2	Vacuum Switching Valve for Active Control Engine Mount
   *3	Engine Mounting Insulator
   *4	ECM
   *5	Air Cleaner
   *6	Vacuum Tank
   *7	to Intake Air Control Valve Actuator

NG → REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

1. Start the engine.
   Fig 2: View Of Vacuum Hose

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the vacuum hose from 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: Go to next step 

1. Remove the vacuum switching valve for active control engine mount.
   Fig 3: Inspecting Duty Vacuum Switching Valve Operation

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check operation of the vacuum switching valve for active control engine mount when battery voltage is applied to the terminals of the vacuum switching valve for active control engine mount 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 vacuum switching valve for active control engine mount.

NG → See step   8 

OK: Go to next step 

1. Disconnect the vacuum switching valve for active control engine mount connector.
   Fig 4: Vacuum Switching Valve For Active Control Engine Mount Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

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   *a	Component without harness connected (Vacuum Switching Valve for Active Control Engine Mount)

3. Reconnect the vacuum switching valve for active control engine mount connector.

NG → See step   8 

OK: Go to next step 

1. Disconnect the vacuum hose from the front engine mount insulator assembly.
   Fig 5: Inspecting Engine Mounting Insulator Assembly Front

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 25 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 → See step   9 

OK: Go to next step 

1. Disconnect the vacuum switching valve for active control engine mount connector.
   Fig 6: Vacuum Switching Valve For Active Control Engine Mount Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the engine switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D4-1 - Body ground	Engine switch on (IG)	11 to 14 V

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   *a	Front view of wire harness connector (to Vacuum Switching Valve for Active Control Engine Mount)

4. Reconnect the vacuum switching valve for active control engine mount connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 2 FUSE - VACUUM SWITCHING VALVE) 

OK: Go to next step 

1. Disconnect the 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
   D4-2 - D1-83 (ACM)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   D4-2 or D1-83 (ACM) - Body ground	Always	10 kΩ or higher

4. Reconnect the ECM connector.
5. Reconnect the vacuum switching valve for active control engine mount connector.

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

OK → See step   10