Toyota Tundra Service Manual: 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).

WIRING DIAGRAM

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:

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

NG

GO TO STEP 4

OK

2.

CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)

NG

REPAIR OR REPLACE VACUUM HOSES

OK

3.

INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

(a) Inspect the intake air control valve (See page ).

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE INTAKE MANIFOLD

4.

INSPECT VACUUM SWITCHING VALVE (FOR ACIS)

(a) Inspect the vacuum switching valve (for ACIS) (See page ).

NG

REPLACE VACUUM SWITCHING VALVE (FOR ACIS)

OK

5.

CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM AND INTEGRATION RELAY)

(a) Remove the EFI NO. 2 fuse from the engine room relay block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

EFI NO. 2 fuse

Always

Below 1 Ω

(c) Reinstall the EFI NO. 2 fuse.

(d) Disconnect the intake air control valve connector.

(e) Disconnect the ECM connector.

(f) Remove the integration relay from the engine room relay block.

(g) Disconnect the integration relay connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D62-2 - D74-62 (ACIS)

Always

Below 1 Ω

D62-1 - 2B-4

Always

Below 1 Ω

D62-2 or D74-62 (ACIS) - Body ground

Always

10 kΩ or higher

D62-1 or 2B-4 - Body ground

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Sfi System

    Basic Inspection

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