Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000YSRI
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: Active Control Engine Mount System; 2017 - 2020 MY Sienna [08/2016 -        ]

Active Control Engine Mount System

DESCRIPTION

LOCATION

*1

Duty Vacuum Switching Valve

*2

Front Engine Mounting Insulator Assembly

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

CHECK VACUUM HOSES

(a) Check the air and vacuum hoses for looseness, disconnection and blockage.

OK:

No looseness, disconnection or blockage.

*1

Engine

*2

Duty Vacuum Switching Valve

*3

Front Engine Mounting Insulator Assembly

*4

ECM

*5

Air Cleaner Filter Element Sub-assembly

*6

Vacuum Tank

*a

to Intake Air Control Valve
NG

REPAIR OR REPLACE VACUUM HOSES
OK

2.

CHECK VACUUM

(a) Disconnect the vacuum hose from the intake air surge tank assembly.

(b) Start the engine.

(c) Check that the disconnected port located on the intake air surge tank assembly applies suction to your finger.

OK:

Vacuum exists.

NG

CHECK AND REPLACE VACUUM SOURCE AND HOSES
OK

3.

INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION)

(a) Inspect the duty vacuum switching valve operation.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): VACUUM SWITCHING VALVE(for Engine Mounting): INSPECTION

NG

REPLACE DUTY VACUUM SWITCHING VALVE

OK

4.

INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)

(a) Inspect the duty vacuum switching valve resistance.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): VACUUM SWITCHING VALVE(for Engine Mounting): INSPECTION

NG

REPLACE DUTY VACUUM SWITCHING VALVE

OK

5.

INSPECT FRONT ENGINE MOUNTING INSULATOR ASSEMBLY (VACUUM LEAK)

(a) Inspect the front engine mounting insulator.

Click here 2017 - 2020 MY Sienna [08/2016 -        ]; 2GR-FKS (ENGINE CONTROL): ACTIVE CONTROL ENGINE MOUNT: ON-VEHICLE INSPECTION

NG

REPLACE FRONT ENGINE MOUNTING INSULATOR ASSEMBLY

OK

6.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF DUTY VACUUM SWITCHING VALVE)

*a

Front view of wire harness connector

(to Duty Vacuum Switching Valve)

(a) Disconnect the duty vacuum switching valve connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A64-1 - Body ground

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN NO. 2 FUSE - DUTY VACUUM SWITCHING VALVE)
OK

7.

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

(a) Disconnect the A64 duty vacuum switching valve connector.

(b) Disconnect the B67 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A64-2 - B67-39 (ACM)

Always

Below 1 Ω

A64-2 or B67-39 (ACM) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR