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

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fe Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE INTAKE AIR CONTROL VALVE)

CHECK INTAKE AIR CONTROL VALVE ASSEMBLY (OPERATION)

CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM, EFI NO. 2 FUSE)

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


DESCRIPTION

When the Intake Air Control Valve (IACV) opens and closes, the ACIS control circuit causes the engine load intake efficiency to increase. When the engine is running at 2,450 to 4,100 rpm and the throttle valve opening angle is 30°or more, current flows through the ACIS control circuit and the IACV closes. For all other situations, current does not flow through the ECM and the IACV is open.

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)


DTC No.
DTC Detection Condition
Trouble Area
P0660
The following conditions are met simultaneously for 0.5 seconds or more (2 trip detection logic):
  1. Voltage of terminal ACIS of the ECM is low when the VSV is OFF.
  2. The engine has been started.
  1. Open or short in intake control valve circuit
  2. Surge tank (intake air control valve)
  3. ECM

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE INTAKE AIR CONTROL VALVE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester II ON.

  1. Enter the following menus: Power train / Engine / Active Test / Activate the VSV for Intake Control.

  1. Check if operating noise can be heard when operating the intake control valve using the intelligent tester.

    OK:
    Operating noise can be heard.


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.CHECK INTAKE AIR CONTROL VALVE ASSEMBLY (OPERATION)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)

  1. Disconnect the intake air control valve connector.

  1. Apply battery voltage between the terminals of the intake air control valve connector.

  1. Check intake air control valve operation.

    OK:
    Operating noise can be heard.


NG
REPLACE SURGE TANK
OK


3.CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM, EFI NO. 2 FUSE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fe Engine Control System.Sfi System. Dtc P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)

  1. Check the wire harness between the intake air control valve connector and the ECM connector.

    1. Disconnect the intake air control valve connector.

    2. Disconnect the E6 ECM connector.

    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Intake air control valve (E58-1) - ACIS (E6-13)
      		Below 1 Ω
      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Intake air control valve (E58-1) or ACIS (E6-13) - Body ground
      		10 kΩ or higher

  1. Check the wire harness between the intake air control valve connector and the EFI NO. 2 fuse.

    1. Disconnect the intake air control valve connector.

    2. Remove the EFI NO. 2 fuse from the engine room No. 2 junction block.

    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Intake air control valve (E58-2) - EFI No. 2 fuse (2) of Engine room No. 2 relay block
      		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM