Active Control Engine Mount System: Procedure

1. If the hose is damaged, replace the vacuum hose assembly.
   Fig 1: Identifying Air & Vacuum Hose System Components

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2. Check the air and vacuum hoses for looseness, disconnection and blockage.
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   *1	Engine
   *2	VSV
   *3	Engine Mounting Insulator FR
   *4	ECM
   *5	Air Cleaner
   *6	Vacuum Tank
   *7	Intake Air Control Valve Actuator

NG → REPAIR OR REPLACE VACUUM HOSES 

OK: Go to next step 

1. Check the vacuum tank, refer to ON-VEHICLE INSPECTION .

NG → REPLACE AIR CLEANER CAP 

OK: Go to next step 

1. Connect the oscilloscope between terminals ACM and E1 of the ECM connectors.
   Fig 2: Identifying ECM Connector & Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Warm up the engine to normal operating temperature.
3. Turn the A/C switch on.
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   B48-9 (ACM) - B49-12 (E1)	Shift position is D, and engine speed is 850 RPM or less	Pulse generation
   	Shift position is D, and engine speed is 950 RPM or more	9 to 14 V
   	Shift position is P	9 to 14 V

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   *a	Component with harness connector (ECM)

NG → See step   6 

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 → See step   9 

OK: Go to next step 

1. Disconnect the vacuum hose from the front engine mount insulator.
   Fig 4: 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 pressure exists.

5. Reconnect the vacuum hose.

NG → See step   10 

OK → SYSTEM OK 

1. Disconnect the VSV for ACM connector.
   Fig 5: Identifying VSV & ACM 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 (VSV for ACM Connector)

3. Reconnect the VSV for ACM connector.

NG → See step   9 

OK: Go to next step 

1. Disconnect the VSV for ACM connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Check for open 

   Check for open 

   Tester Connection	Condition	Specified Condition
   B8-2 - B48-9 (ACM)	Always	Below 1 Ω

   Tester Connection	Condition	Specified Condition
   B8-2 or B48-9 (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 (VSV FOR ACM - ECM) 

OK: Go to next step 

1. Remove the EFI No. 3 fuse from the engine room relay block.
   Fig 6: Identifying Efi No. 3 Fuse From The Engine Room Relay Block

   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
   EFI No. 3 fuse	Always	Below 1 Ω

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   *1	Engine Room Relay Block

3. Reinstall the EFI No. 3 fuse.

NG → REPLACE FUSE (EFI NO. 3 FUSE) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACM)