OBD II scan tool (excluding hand-held tester):

INSPECT VSV FOR ACIS (OPRATION)
1. Disconnect the VSV for ACIS connector.
2. Check operation of the VSV for ACIS when positive battery voltage is applied to the terminals of the VSV for ACIS connector.
  Standard:
  
  Positive battery voltage is not applied:
  
  Air from port E flows out through the air filter.
  
  Positive battery voltage is applied:
  
  Air from port E flows out through port F.
  
  Fig 1: Checking Air Flow From Port E To Air Filter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Applying Positive Battery Voltage To Terminals Of VSV For ACIS Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE VSV FOR ACIS

OK: GO TO NEXT STEP.
INSPECT ECM (ACIS VOLTAGE)
1. Start the engine.
2. Measure the voltage between the specified terminals of the E8 and E10 ECM connectors.
  Standard:
  
  Fig 3: ECM Connector Terminals Specified Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to step 4

NG: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS -EFI RELAY)
1. Check the wire harness between the VSV for ACIS connector and the ECM connector.
  1. Disconnect the V1 VSV for ACIS connector.
  2. Disconnect the E10 ECM connector.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 5: VSV For ACIS And ECM Connector Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard (Check for short):
    
    Fig 6: VSV For ACIS And ECM Connector Terminals Specified Condition Chart (Check For Short)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reconnect the VSV for ACIS connector.
  5. Reconnect the ECM connector.
    
    Fig 7: Identifying VSV For ACIS Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 8: Disconnecting E10 ECM Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the wire harness between the VSV for ACIS and the EFI relay.
  1. Disconnect the V1 VSV for ACIS connector.
  2. Remove the EFI relay from the engine room J/B.
  3. Check the resistance between the wire harness side connectors.
    Standard (Check for open):
    
    Fig 9: VSV For ACIS And EFI Relay Terminals Specified Condition Chart (Check For Open)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 10: Identifying EFI Relay
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Reconnect the VSV for ACIS connector.
  5. Reinstall the EFI relay.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.
CHECK VACUUM HOSES (INTAKE MANIFOLD - INTAKE AIR CONTROL VALVE, INTAKE AIR CONTROL VALVE - VSV FOR ACIS)
1. Check that the vacuum hoses are connected correctly.
2. Check that the vacuum hoses are not loose or disconnected.
3. Check the vacuum hoses for cracks, holes or damage.
NG: REPAIR OR REPLACE VACUUM HOSE

OK: GO TO NEXT STEP.
INSPECT INTAKE AIR CONTROL VALVE (See INSPECTION )
NG: REPLACE INTAKE AIR CONTROL VALVE

OK: REPLACE ECM (See ECM (3MZ-FE) )