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

A015630E01
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 acoustic control induction system terminal of the ECM is low when the actuator is off.

  2. The engine has been started.

  • Open or short in intake air control valve circuit

  • Intake air surge tank assembly (intake air control valve assembly)

  • ECM

WIRING DIAGRAM

A015CJAE01

INSPECTION PROCEDURE

Note

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

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE


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

    A015CTTE01
    Text in Illustration
    *a VSV is ON
    *b VSV is OFF
    *c Air

    1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).

    2. Connect the GTS to the DLC3.

    3. Start the engine.

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

    5. Operate the VSV for ACIS.

    6. 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

    INSPECT VACUUM SWITCHING VALVE (FOR ACIS) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT VACUUM SWITCHING VALVE (FOR ACIS)


    1. Inspect the vacuum switching valve (for ACIS) Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE (FOR ACIS) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE VOLTAGE)


    1. A0156OFE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Intake Air Control Valve Assembly)

      Disconnect the intake air control valve assembly connector.

    2. Turn the engine switch on (IG).

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

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

    4. Reconnect the intake air control valve assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - VACUUM SWITCHING VALVE)

    OK

  4. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM)


    1. Disconnect the intake air control valve assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      C129-2 - C46-62 (ACIS) Always Below 1 Ω
      C129-2 or C46-62 (ACIS) - Body ground Always 10 kΩ or higher
      for LHD
      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

    4. Reconnect the intake air control valve assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VACUUM SWITCHING VALVE - ECM)

    OK

    REPLACE ECM Click here