ACIS Control Circuit

4GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Control Circuit
- ACIS Control Circuit

DESCRIPTION

When the Intake Air Control Valve (IACV) opens and closes, the Acoustic Control Induction System (ACIS) control circuit causes the engine load intake efficiency to increase. When the engine is running at 2450 to 4100 rpm and the throttle valve opening angle is 30° or more, current flows through the ACIS control circuit and the IACV closes. For all other situations, current does not flow through the ECM and the IACV is open.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR INTAKE CONTROL)

(a) Connect Techstream to the DLC3.

(b) Start the engine and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Intake Control.

(d) Check if operating noise can be heard when operating the intake control valve using Techstream.

OK:

Operating noise can be heard.

NG -- CHECK AIR INTAKE CONTROL VALVE ASSEMBLY (OPERATION)

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

2. CHECK AIR INTAKE CONTROL VALVE ASSEMBLY (OPERATION)

(a) Inspect the air intake control valve assembly Intake System.

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

3. CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE ASSEMBLY VOLTAGE)

(a) Disconnect the E50 intake air control valve assembly connector.

(b) Turn the engine 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 assembly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - INTAKE AIR CONTROL VALVE ASSEMBLY)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (VSV ACIS - ECM, VSV ACIS - EFI NO. 2 FUSE)

(a) Disconnect the E50 intake air control valve assembly connector.

(b) Disconnect the E5 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the intake air control valve assembly connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal