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

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

Text in Illustration





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:





Text in Illustration





NG -- INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)
OK -- Continue to next step.

4. INSPECT DUTY VACUUM SWITCHING VALVE (FOR ACM)

(a) Inspect the VSV for ACM Testing and Inspection.

NG -- REPLACE DUTY VACUUM SWITCHING VALVE Components
OK -- Continue to next step.

5. INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT

(a) Inspect the front engine mount insulator Inspection.

NG -- REPLACE ENGINE MOUNTING INSULATOR ASSEMBLY FRONT Components

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

6. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE)

(a) Inspect the VSV for ACM Testing and Inspection.

NG -- REPLACE DUTY VACUUM SWITCHING VALVE Components
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 -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - VSV FOR ACM)