Active Control Engine Mount System [12/2019 - 10/2022]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Engine
   *2	Intake Air Surge Tank Assembly
   *3	Front Engine Mounting Insulator
   *4	ECM
   *5	Vacuum Switching Valve (for Active Control Engine Mount)

   OK

   No looseness, disconnection or blockage.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE VACUUM HOSES 

Result: 

OK 

See step  2

1. Disconnect the vacuum hose from the intake air surge tank assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Start the engine.
3. Check that the disconnected port located on the intake air surge tank assembly applies suction to your finger.

   OK

   Vacuum exists.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CHECK AND REPLACE VACUUM SOURCE AND HOSES 

Result: 

OK 

See step  3

Refer to INSPECTION [12/2019 - 10/2022]

Result

Result: 

NG 

REPLACE VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT). Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

Result: 

OK 

See step  4

Refer to INSPECTION [12/2019 - 10/2022]

Result

Result: 

NG 

REPLACE VACUUM SWITCHING VALVE (FOR ACTIVE CONTROL ENGINE MOUNT). Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

Result: 

OK 

See step  5

Refer to ON-VEHICLE INSPECTION [12/2019 - 09/2020] , or refer to ON-VEHICLE INSPECTION [09/2020 - 10/2022]

Result

Result: 

NG 

REPLACE FRONT ENGINE MOUNTING INSULATOR. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the vacuum switching valve (for active control engine mount) connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   C12-1(+B) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit [12/2019 - 10/2022]  

Result: 

OK 

See step  7

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

   Tester Connection	Condition	Specified Condition
   C12-2 (ACM) - C54-39 (ACM)	Always	Below 1 Ω
   C12-2 (ACM) or C54-39 (ACM) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR