PERFORM ACTIVE TEST (ACIS VSV)

Disconnect the vacuum hose from the port F on the ACIS VSV.
Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Start the engine.
Enter the following menus: ACTIVE TEST / INTAKE CTL VSV1. Operate the AICS VSV.
Check the VSV's air flow when switching the VSV.

Fig 1: Checking VSV Air Flow

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

ACIS VSV OPERATION TABLE

Tester 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 the air filter

OK: Go to step 4

NG: Go to next step

CHECK VACUUM HOSES (INTAKE MANIFOLD - ACIS VSV - IACV)
1. Check the condition of the vacuum hoses between the intake manifold, ACIS VSV and IACV.
  1. The vacuum hoses are connected securely.
  2. Vacuum hoses are not cracked or damaged.
OK:

The vacuum hoses are connected securely and not cracked or damaged.

NG: REPAIR OR REPLACE VACUUM HOSES

OK: Go to next step
INSPECT INTAKE AIR CONTROL VALVE (See INSPECTION )
NG: REPLACE INTAKE AIR CONTROL VALVE

OK: REPLACE ECM (See REPLACEMENT )
INSPECT ACIS VSV (OPERATION)
1. Check that air flows from port E to the air filter.
  
  Fig 2: Checking Air Flow From Port E To Air Filter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage across the terminals.
3. Check that air flows from port E to port F.
Fig 3: Checking Air Flow From Port E To F
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ACIS VSV

OK: Go to next step

CHECK WIRE HARNESS (ECM - ACIS VSV - EFI MAIN RELAY)

Check the wire harness between the ACIS VSV and ECM.

Fig 4: Disconnecting E4 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

ECM - ACIS VSV - EFI MAIN RELAY - RESISTANCE TABLE

Tester Connection	Specified Condition
V2-2 - E4-3 (ACIS)	Below 1 Ω
V2-2 or E4-3 (ACIS) - Body ground	10 kΩ or higher

Check the wire harness between the ACIS VSV and EFI MAIN relay.
1. Disconnect the V2 ACIS VSV connector.
2. Remove the EFI MAIN relay from the engine room No. 2 R/B.
3. Measure the resistance of the wire harness side connectors.

Standard:

ACIS VSV - EFI MAIN RELAY - RESISTANCE TABLE

Tester Connection	Specified Condition
V2-1 - R/B EFI MAIN relay terminal 3	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE ECM (See REPLACEMENT )

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Inspection Procedure