Toyota RAV4 manuals

Toyota Sienna Service Manual: Active Control Engine Mount System

DESCRIPTION

LOCATION

DESCRIPTION

The Active Control Engine Mount (ACM) system decreases engine vibration at engine idling using the ACM VSV. The VSV is controlled by a pulse signal transmitted to the VSV from the ECM. The frequency of this pulse signal is matched to the engine speed to decrease engine vibration.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK VACUUM HOSES

CHECK VACUUM HOSES

(a) If the hose is damaged, replace the vacuum hose assembly.

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

2 CHECK VACUUM

CHECK VACUUM

(a) Start the engine.

(b) Disconnect the vacuum hose from the air cleaner cap.

(c) Check that the disconnected port located on the vacuum tank applies suction to your finger.

OK: Vacuum pressure exists.

(d) Reconnect the vacuum hose.

3 INSPECT ECM

 INSPECT ECM

(a) Connect the oscilloscope between terminals ACM and E1 of the E9 and E11 ECM connectors.

(b) Warm up the engine to normal operating temperature.

(c) Turn the A/C switch on.

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

Standard voltage

4 INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)

INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)

(a) Disconnect the V3 VSV for ACM connector.

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

Standard resistance: 19 to 21 Ω at 20°C (68°F)

(c) Reconnect the VSV for ACM connector.

5 CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM)

CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM)

(a) Check the wire harness between the VSV for ACM connector and the ECM connector.

(1) Disconnect the V3 VSV for ACM connector.

(2) Disconnect the E9 ECM connector.

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

Standard resistance: 

(4) Reconnect the ECM connector.

6 INSPECT FUSE (EFI NO. 2 FUSE)

INSPECT FUSE (EFI NO. 2 FUSE)

(a) Remove the EFI No. 2 fuse from the engine room junction block.

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

Standard resistance: Below 1 Ω

(c) Reinstall the EFI No. 2 fuse.

7 INSPECT RELAY (EFI RELAY)

INSPECT RELAY (EFI RELAY)

(a) Remove the EFI relay from the engine room junction block.

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

Standard resistance

(c) Reinstall the EFI relay.

8 CHECK HARNESS AND CONNECTOR (VSV FOR ACM - EFI RELAY)

CHECK HARNESS AND CONNECTOR (VSV FOR ACM - EFI RELAY)

(a) Check the wire harness between the VSV for ACM and the EFI relay.

(1) Remove the EFI relay from the engine room junction block.

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

Standard resistance:

(3) Reconnect the VSV for ACM connector.

(4) Reinstall the EFI relay.

CHECK ECM POWER SOURCE CIRCUIT

9 INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION)

INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION)

(a) Remove the VSV for ACM.

(b) 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.

(c) Reinstall the VSV for ACM.

10 INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT

INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT

(a) Disconnect the vacuum hose from the front engine mount insulator.

(b) Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute.

(c) Check that there is no change in the needle movement of the vacuum pump gauge.

(d) Check that there is no fluid leakage caused by a break in the diaphragm.

OK: Vacuum pressure exists.

(e) Reconnect the vacuum hose.

SYSTEM OK

A/F Sensor Circuit Slow Response
HINT: DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor. DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor. Bank 1 refers to the bank that includes cylinder ...

EVAP System
RELATED DTCS If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below. NOTICE: If the 0.02 inch reference pressure difference between the ...

Other materials:

How to proceed with troubleshooting
Hint: The ecm of this system is connected to the can and multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the can and multiplex communication systems The intelligent tester can be used at steps 3, 4, 6, and 9. ...

System Voltage
DTC P0560 System Voltage MONITOR DESCRIPTION The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, these memori ...

On-vehicle inspection
1. INSPECT SPEEDOMETER  Check the operation.  Using a speedometer tester, check the speedometer indication according to the table below. Reference: mph (U.S.A.) Reference: km/h (Canada) NOTICE: Tire wear as well as over or under inflation will cause errors. ...

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