ACIS Control Circuit
2UZ-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 the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 4200 rpm or more and the throttle valve opening angle is 60° or more, the IACV is open (VSV: OFF). At all other times, the IACV is closed (VSV: ON).
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS)
(a) Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.
(e) Operate the VSV for ACIS.
(f) Check the VSV air flow when switching the VSV.
OK:
NG -- INSPECT VACUUM SWITCHING VALVE
OK -- Continue to next step.
2. CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)
NG -- REPAIR OR REPLACE VACUUM HOSES
OK -- Continue to next step.
3. INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)
(a) Inspect the intake air control valve Testing and Inspection.
NG -- REPLACE INTAKE MANIFOLD
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. INSPECT VACUUM SWITCHING VALVE
(a) Inspect the vacuum switching valve Testing and Inspection.
NG -- REPLACE VACUUM SWITCHING VALVE
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM, INTEGRATION RELAY)
(a) Remove the EFI NO. 2 fuse from the engine room relay block.
(b) Check the EFI NO. 2 fuse.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(d) Reinstall the EFI NO. 2 fuse.
(e) Disconnect the D61 intake air control valve connector.
(f) Disconnect the D74 ECM connector.
(g) Remove the integration relay from the engine room relay block.
(h) Disconnect the 1B integration relay connector.
(i) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM