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).

A01EJ8TE03
DTC No. DTC Detection Condition Trouble Area
P0660

The following conditions are met simultaneously for 0.5 seconds or more (2 trip detection logic):


  • The voltage of terminal acoustic control induction system of the ECM is low when the vacuum switching valve assembly (for acoustic control induction system) is off.

  • The engine has been started.

  • Open or short in vacuum switching valve assembly (for acoustic control induction system) circuit

  • Vacuum switching valve assembly (for acoustic control induction system)

  • ECM

WIRING DIAGRAM

A01EMGGE02

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 (ACTIVATE THE VSV FOR INTAKE CONTROL)


    1. A01EMD4E04
      Text in Illustration
      *1 Port F
      *2 Port E
      *3 Air Filter
      *a Vacuum Switching Valve Assembly is ON
      *b Vacuum Switching Valve Assembly is OFF
      *c Air

      Disconnect the vacuum hose from port F of the vacuum switching valve assembly (for acoustic control induction system).

    2. Connect the GTS to the DLC3.

    3. Start the engine.

    4. Turn the GTS on.

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

    6. Operate the vacuum switching valve assembly (for acoustic control induction system).

    7. Check the vacuum switching valve assembly (for acoustic control induction system) air flow when switching the vacuum switching valve assembly (for acoustic control induction system).

      Standard
      Activate the VSV for Intake Control Specified Condition
      ON Air from port E flows out through port F
      OFF Air from port E flows out through air filter
      Result
      Result Proceed to
      Abnormal A
      Normal B

      Tech Tips

      Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR ACOUSTIC CONTROL INDUCTION SYSTEM)


    1. Inspect the vacuum switching valve assembly (for acoustic control induction system) Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR ACOUSTIC CONTROL INDUCTION SYSTEM) Click here

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE ASSEMBLY (FOR ACOUSTIC CONTROL INDUCTION SYSTEM))


    1. A01EJKEE98
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Vacuum Switching Valve Assembly (for Acoustic Control Induction System))

      Disconnect the vacuum switching valve assembly (for acoustic control induction system) 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 Condition Specified Condition
      B52-2 - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - VACUUM SWITCHING VALVE ASSEMBLY (FOR ACOUSTIC CONTROL INDUCTION SYSTEM))

    OK

  4. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY (FOR ACOUSTIC CONTROL INDUCTION SYSTEM) - ECM)


    1. Disconnect the vacuum switching valve assembly (for acoustic control induction system) 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
      B52-1 - B58-27 (ACIS) Always Below 1 Ω
      B52-1 or B58-27 (ACIS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here