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SFI SYSTEM, Diagnostic DTC:P0660

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DTC Code DTC Name
P0660 Intake Manifold Tuning Valve Control Circuit / Open (Bank 1)
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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
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

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.

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PROCEDURE


  1. Click here

    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 / Activate 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

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    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.

  3. Click here

    INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)


    1. Inspect the intake air control valve (Click here).


  4. Click here

    INSPECT VSV FOR ACIS (OPERATION)


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


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    INSPECT VSV FOR ACIS (POWER SOURCE VOLTAGE)


    1. Disconnect the VSV for ACIS connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C129-1 - Body ground Engine switch on (IG) 11 to 14 V

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    CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM)


    1. Disconnect the VSV for ACIS connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C129-2 - C45-62 (ACIS) Always Below 1 Ω
      C129-2 or C45-62 (ACIS) - Body ground Always 10 kΩ or higher

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    REPAIR OR REPLACE VACUUM HOSE

  8. Click here

    REPLACE INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)Click here

  9. Click here

    REPLACE VSV FOR ACISClick here

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

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE ECMClick here

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    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here