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 4450 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 (ACTIVE THE VSV FOR INTAKE CONTROL)
(a) Connect Techstream to the DLC3.
(b) Start the engine and turn the tester on.
(c) Select the following menu items: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.
(d) Check the operation of the VSV when the intake air control is operated by the tester.
OK:
Operational noise can be heard.
NG -- CHECK INTAKE AIR CONTROL VALVE (OPERATION)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK INTAKE AIR CONTROL VALVE (OPERATION)





(a) Disconnect the intake air control valve 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.
(d) Reconnect the intake air control valve connector.
NG -- REPLACE INTAKE AIR SURGE TANK
OK -- Continue to next step.
3. INSPECT TERMINAL VOLTAGE (INTAKE AIR CONTROL VALVE CONNECTOR)





(a) Disconnect the intake air control valve connection.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(d) Reconnect the intake air control valve connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 - INTAKE AIR CONTROL VALVE)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM)





(a) Disconnect the intake air control valve 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 short





(d) Reconnect the intake air control valve connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACIS - ECM)
OK -- REPLACE ECM