Active Control Engine Mount System

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Active Control Engine Mount System

Active Control Engine Mount System

DESCRIPTION

LOCATION





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





INSPECTION PROCEDURE

PROCEDURE

1. 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.
NG -- REPAIR OR REPLACE VACUUM HOSES
OK -- Continue to next step.
2. CHECK VACUUM TANK
(a) Check the vacuum tank Testing and Inspection.
NG -- REPLACE AIR CLEANER CAP
OK -- Continue to next step.
3. INSPECT ECM





(a) Connect the oscilloscope between terminals ACM and E1 of the 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:






NG -- INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)
OK -- Continue to next step.
4. 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.
NG -- REPLACE DUTY VACUUM SWITCHING VALVE
OK -- Continue to next step.
5. 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.
NG -- REPLACE ENGINE MOUNTING INSULATOR ASSEMBLY FRONT
OK -- SYSTEM OK
6. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)





(a) Disconnect the VSV for ACM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reconnect the VSV for ACM connector.
NG -- REPLACE DUTY VACUUM SWITCHING VALVE
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM)





(a) Disconnect the VSV for ACM connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Check for open





Check for open





(d) Reconnect the ECM connector.
(e) Reconnect the VSV connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACM - ECM)
OK -- Continue to next step.
8. INSPECT FUSE (EFI NO. 3 FUSE)





(a) Remove the EFI No. 3 fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) 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)