SFI SYSTEM, Diagnostic DTC:P0660

DTC Code DTC Name
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 changes in the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).

A172378E05
Table 1. Text in Illustration

*a

Intake Air Control Valve Open

*b

Intake Air Control Valve Closed

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. The voltage of terminal ACIS of the ECM is low when the VSV is off.

  2. The engine has been started.

  • Open or short in VSV for ACIS circuit

  • Intake manifold (intake air control valve)

  • ECM

WIRING DIAGRAM

A342931E02

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

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

    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

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

    4. Check if an operating noise can be heard when operating the air intake control valve using the GTS.

      OK

      Operating noise can be heard.

    CHECK FOR INTERMITTENT PROBLEMS

    (Click here)

  2. INSPECT VSV FOR ACIS

    1. Check the VSV for ACIS (Click here).

    REPLACE VSV FOR ACIS

    (Click here)

  3. CHECK VSV FOR ACIS (POWER SOURCE)

    1. U122290E02

      Disconnect the VSV for ACIS connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      C106-2 - Body ground

      Ignition switch ON

      11 to 14 V
      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to VSV for ACIS)

    4. Reconnect the VSV for ACIS connector.

    CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - INTEGRATION RELAY)Click here

  4. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - 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 (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      C106-1 - C111-62 (ACIS)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      C106-1 or C111-62 (ACIS) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the VSV for ACIS connector.

    REPLACE ECM

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACIS - ECM)

  5. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - INTEGRATION RELAY)

    1. Disconnect the VSV for ACIS connector.

    2. Remove the integration relay (EFI MAIN relay) from the engine room No. 1 relay block and disconnect the integration relay connector.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      C106-2 - 1B-4

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      C106-2 or 1B-4 - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the integration relay connector.

    5. Reinstall the integration relay.

    6. Reconnect the VSV for ACIS connector.

    GO TO ECM POWER SOURCE CIRCUIT

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACIS - INTEGRATION RELAY)