Diagnostic trouble code P0660 3UR-FE Land Cruiser

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK VACUUM HOSE

INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

INSPECT VSV FOR ACIS (OPERATION)

CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI NO. 2 FUSE)

DTC P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)

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).

DTC Code	DTC Detection Condition	Trouble Area
P0660	Conditions (a) and (b) are met for 0.5 sec. or more (2 trip detection logic): (a) The voltage of terminal ACIS of the ECM is low when the VSV is OFF. (b) The engine has started.	Open or short in VSV for ACIS circuit VSV for ACIS ECM

Wiring diagram

Inspection procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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

1. Disconnect the vacuum hose.

2. Connect the intelligent tester to the DLC3.

3. Turn the engine switch on (IG) and turn the tester on.

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control. Operate the VSV for ACIS.

5. Check the VSV operation when it is operated using the tester.

   Standard:

   Tester Operation	Specified Condition
   VSV ON	Air from port E flows out through port F
   VSV OFF	Air from port E flows out through air filter

NG	Go to step 4

OK

2.CHECK VACUUM HOSE

1. Check that the vacuum hose is connected correctly, and that there are no cracks, holes, damage, or looseness.

   OK:

   Vacuum hose is normal.

NG	REPAIR OR REPLACE VACUUM HOSE

OK

3.INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

1. Inspect the intake air control valve .

NG	REPLACE INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4.INSPECT VSV FOR ACIS (OPERATION)

1. Inspect the VSV for ACIS .

NG	REPLACE VSV FOR ACIS

OK

5.CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI NO. 2 FUSE)

1. Check the wire harness and connectors between the VSV for ACIS and ECM.

   1. Disconnect the VSV for ACIS connector.

   2. Disconnect the ECM connector.

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      C129-2 - C45-62 (ACIS)	Always	Below 1 ?
      C129-2 or C45-62 (ACIS) - Body ground	Always	10 k? or higher

2. Check the wire harness between the VSV for ACIS and EFI NO. 2 fuse.

   1. Disconnect the VSV for ACIS connector.

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

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      C129-1 - EFI NO. 2 fuse	Always	Below 1 ?

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE ECM