Description

This circuit opens and closes the Intake Air Control Valve (IACV) in response to changes in the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System). When the engine speed is between 2,200 rpm and 4,100 rpm and the throttle valve opening angle is 60° or more, the ECM supplies current to the VSV (ON status), to close the IACV. Under other conditions, the VSV is usually OFF and the IACV is open.

WIRING DIAGRAM

3

1

i

5

2

EFI Relay

EFI No.2

Battery

Engine Room R/B

Engine Room J/B

ACIS VSV

Engine

Room

14 8

MREL

ACIS

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE VSV FOR ACIS)

(a) Disconnect the vacuum hose.

(b) Connect an intelligent tester to the DLC3.

(c) Turn the ignition switch ON and turn the tester ON.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the VSV for ACIS.

(e) Check the VSV operation when it is operated using an intelligent tester.

Tester Operations

Specified Conditions

VSV ON

Air from port E flows out through port F

VSV OFF

Air from port E flows out through air filter

(f) Reconnect the vacuum hose.

Go to step 4

CHECK VSV FOR ACIS (OPERATION)

(a) Check that air flows from port E to the air filter.

(b) Apply positive battery voltage across the terminals.

(c) Check that air flows from port E to port F.

REPLACE VSV FOR ACIS

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY)

Wire Harness Side:

Front View

VSV for ACIS connector

Front View

VSV for ACIS connector

ECM Connector

ECM Connector

Engine Room R/B:

Engine Room R/B:

EFI Relay

(a) Check the wire harness and connectors between the VSV for ACIS and ECM.

(1) Disconnect the V3 VSV for ACIS connector.

(2) Disconnect the E4 ECM connector.

(3) Check the resistance.

Standard Resistance (Check for open)

Tester Connections

Specified Conditions

VSV for ACIS (V3-2) - ACIS (E4-33)

Below 1 Q

Standard Resistance (Check for short)

Tester Connections

Specified Conditions

VSV for ACIS (V3-2) or ACIS (E4-33) - E1 (E6-1)

10 kQ or higher

(4) Reconnect the VSV for ACIS connector.

(5) Reconnect the ECM connector.

(b) Check the wire harness between the VSV for ACIS and EFI relay.

(1) Disconnect the V3 VSV for ACIS connector.

(2) Remove the EFI relay from the engine room R/B.

(3) Check the resistance.

Standard Resistance (Check for open)

Tester Connections

Specified Conditions

VSV for ACIS (V3-1) - EFI relay terminal 3 of R/B

Below 1 Q

(4) Reconnect the VSV for ACIS connector.

(5) Reinstall the EFI relay.

REPAIR OR REPLACE HARNESS OR CONNECTOR

A116305E02

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

(a) Check that the vacuum hose is connected correctly.

(b) Check the vacuum hose for looseness and disconnection.

(c) Check the vacuum hose for cracks, holes and damage.

REPAIR OR REPLACE VACUUM HOSES

INSPECT INTAKE AIR CONTROL VALVE (INTAKE AIR SURGE TANK)

REPLACE INTAKE AIR CONTROL VALVE (INTAKE AIR SURGE TANK)

REPLACE ECM

MIL Circuit

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Responses

  • MATILDA
    What are hoses that go to battery in tacoma truck?
    2 years ago

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