Active Control Engine Mount System: Procedure

1. If the hose is damaged, replace the vacuum hose assembly.
   Fig 1: Checking Vacuum Hoses

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

NG → REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

1. Start the engine.
   Fig 2: Disconnecting Vacuum Hose From Air Cleaner Cap

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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 pressure exists.

4. Reconnect the vacuum hose.

NG → CHECK AND REPLACE VACUUM SOURCE AND HOSES 

OK: Go to next step 

1. Remove the VSV for ACM.
   Fig 3: Inspecting Duty Vacuum Switching Valve Operation

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check operation of the VSV for ACM when positive battery voltage is applied to the terminals of the VSV for ACM connector.

   Positive battery voltage is not applied

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

   Positive battery voltage is applied

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

3. Reinstall the VSV for ACM.

NG → REPLACE DUTY VACUUM SWITCHING VALVE 

OK: Go to next step 

1. Disconnect the VSV for ACM connector.
   Fig 4: Identifying C34 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance between terminals 1 and 2.

   Standard resistance

   Tester Connections	Condition	Specified Conditions
   1 - 2	20°C (68°F)	19 to 21 Ω

3. Reconnect the VSV for ACM connector.

NG → REPLACE DUTY VACUUM SWITCHING VALVE 

OK: Go to next step 

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

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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 pressure exists.

5. Reconnect the vacuum hose.

NG → REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY 

OK: Go to next step 

1. Check the wire harness between the VSV for ACM connector and the ECM connector.
   Fig 6: Identifying C34 And C55 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the VSV for ACM connector.
   2. Disconnect the ECM connector.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open)

      Tester Connections	Condition	Specified Conditions
      C34-2 - C55-42 (ACM)	Always	Below 1 Ω

      Standard resistance (Check for open)

      Tester Connections	Condition	Specified Conditions
      C34-2 or C55-42 (ACM) - Body ground	Always	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the VSV connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the VSV connector.
   Fig 7: Identifying C34 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch to ON.
3. Measure the voltage between the terminals.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   C34-1 - Body ground	Ignition switch ON	11 to 14 V

NG → See step   9 

OK → See step   8 

1. Check the wire harness between the VSV for ACM and the EFI relay.
   1. Disconnect the VSV connector.
      Fig 8: Identifying Engine Room Relay Block And Engine Room Junction Block

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Remove the engine room junction block.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open)

      Tester Connections	Condition	Specified Condition
      C34-1 - 1E-6 (Engine room relay block)	Always	Below 1 Ω

      Standard resistance (Check for short)

      Tester Connections	Condition	Specified Condition
      C34-1 or 1E-6 (Engine room relay block) - Body ground	Always	10 kΩ or higher

   4. Reconnect the VSV for ACM connector.
   5. Reinstall the engine room junction block.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the engine room junction block.
   Fig 9: Identifying Engine Room Junction Block & Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the EFI relay resistance.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1E-12 - 1E-6	Always	10 kΩ or higher
   1E-12 - 1E-6	Always	Bellow 1 Ω (Apply battery voltage between terminals 1E-9 and 1E-10)

3. Reinstall the engine room junction block.

NG → REPLACE ENGINE ROOM JUNCTION BLOCK 

OK → See step   10