ACIS Control Circuit

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Control Circuit

ACIS Control Circuit

DESCRIPTION

This circuit opens and closes the Intake Air Control Valve (IACV) in response to changes in the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is between 0 and 4,450 rpm and the throttle valve opening angle is 60° or more, the ECM supplies current to the VSV (ON status), to close the IACV. Under other conditions, the VSV is usually OFF and the IACV is open.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS)
(a) Connect Techstream to the DLC3.
(b) Start the engine and turn the tester on.
(c) Select the following menu items: Powertrain / Engine / Active Test / Activate the VSV for ACIS. Operate the VSV for ACIS.
OK:
Operational noise can be heard.
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG -- Continue to next step.

2. CHECK INTAKE AIR CONTROL VALVE (OPERATION)





(a) Disconnect the VSV for ACIS connector.
(b) Apply battery voltage between the terminals of the air intake valve connector.
(c) Check the air intake valve operation.
OK:
Operational noise can be heard.

NG -- REPLACE INTAKE AIR SURGE TANK
OK -- Continue to next step.

3. INSPECT TERMINAL VOLTAGE (INTAKE AIR CONTROL VALVE)





(a) Disconnect the VSV for ACIS connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) on the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 2 FUSE - INTAKE AIR CONTROL VALVE)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY)





(a) Check the wire harness and connectors between the VSV for ACIS and ECM.
(1) Disconnect the VSV for ACIS connector.
(2) Disconnect the ECM connector.
(3) Measure the resistance between the terminals of the VSV for ACIS connector and ECM connector.
Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the VSV for ACIS connector.
(5) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM