Inspection Procedure

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

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS)

Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
Connect the Techstream to the DLC3.
Start the engine.
Enter the following menus: Powertrain / Engine / Active Test / Active the VSV for Intake Control.
Operate the VSV for ACIS.

Check the VSV air flow when switching the VSV on and off.

SPECIFIED CONDITION CHART

Test Condition	Specified Condition
VSV Is ON	Air from port E flows out through port F
VSV Is OFF	Air from port E flows out through air filter

Fig 1: Identifying VSV ON And OFF Position

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4

OK: Go to Next Step

CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)
1. Check the vacuum hoses (See ON-VEHICLE INSPECTION ).
  NG: REPAIR OR REPLACE VACUUM HOSES
  
  OK: Go to Next Step
INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)
1. Inspect the intake air control valve (See INSPECTION ).
  NG: REPLACE INTAKE MANIFOLD (See REMOVAL )
  
  OK: PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
INSPECT VACUUM SWITCHING VALVE (VSV FOR ACIS)
1. Inspect the vacuum switching valve (See INSPECTION ).
  NG: REPLACE VACUUM SWITCHING VALVE (See REMOVAL )
  
  OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS VOLTAGE)

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Switch Condition	Specified Condition
B52-2 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

ILLUSTRATION LEGEND

*1	Front view of wire harness connector (to VSV for ACIS)

Fig 2: Identifying B52 ACIS Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reconnect the VSV for ACIS connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACIS)

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM)

Disconnect the VSV for ACIS connector.

Fig 3: Checking Harness And Connector (VSV For ACIS - ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the ECM connector.

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

Standard Resistance (Check for Open)

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
B52-1 - B58-27 (ACIS)	Always	Below 1 Ω

Standard Resistance (Check for Short)

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
B52-1 or B58-27 (ACIS) - Body ground	Always	10 kΩ or higher

Text in Illustration

ILLUSTRATION LEGEND

Front view of wire harness connector (to VSV for ACIS)

Front view of wire harness connector (to ECM)

Reconnect the VSV for ACIS connector.
Reconnect the ECM connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE ECM (See REMOVAL )