Toyota Tundra (2015 year). Manual — part 1694

OK

REPLACE ECM

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Ho...

Last Modified: 9-16-2014

6.6 J

Doc ID: RM00000222508FX

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Control Circuit; 2015 MY Tundra [08/2014 -

]

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

INSPECTION PROCEDURE

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Contro...

OK

OK

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

2.

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

NG

REPAIR OR REPLACE VACUUM HOSES

3.

INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

(a) Inspect the intake air control valve

.

NG

REPLACE INTAKE MANIFOLD

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Contro...

OK

IN PROBLEM SYMPTOMS TABLE

4.

INSPECT VACUUM SWITCHING VALVE (FOR ACIS)

(a) Inspect the vacuum switching valve (for ACIS)

.

NG

REPLACE VACUUM SWITCHING VALVE (FOR

ACIS)

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) Check the EFI NO. 2 fuse.

(c) 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

(d) Reinstall the EFI NO. 2 fuse.

(e) Disconnect the D62 intake air control valve connector.

(f) Disconnect the D74 ECM connector.

(g) Remove the integration relay from the engine room relay block

.

(h) Disconnect the 1B integration relay connector.

(i) 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 - 1B-4

Always

Below 1 Ω

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

Always

10 kΩ or higher

D62-1 or 1B-4 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE ECM

3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: ACIS Contro...