SFI SYSTEM(w/ EGR 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).

A233285E02

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P0660

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

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

Comes on

DTC stored

WIRING DIAGRAM

A231452E13

CAUTION / NOTICE / HINT

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. 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 INTELLIGENT TESTER (OPERATE VSV FOR ACIS)

    1. A233358C02

      *a

      VSV is ON

      *b

      VSV is OFF

      *c

      Air

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

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

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

      Powertrain > Engine and ECT > Active Test

      Tester Display

      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

      Result

      Result

      OK

      NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

  2. INSPECT VACUUM SWITCHING VALVE (FOR ACIS)

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

      Click here

      Result

      Result

      OK

      NG
    NG

    REPLACE VACUUM SWITCHING VALVE (FOR ACIS)

    Click hereClick here

    OK

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

    1. A219139C01

      *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

      C9-1 - Body ground

      Engine switch on (IG)

      11 to 14 V

    4. Reconnect the intake air control valve assembly connector.

      Result

      Result

      OK

      NG
    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

      Tester Connection

      Condition

      Specified Condition

      C9-2 - C30-19 (ACIS)

      Always

      Below 1 Ω

      C9-2 or C30-19 (ACIS) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the intake air control valve assembly connector.

    5. Reconnect the ECM connector.

      Result

      Result

      OK

      NG
    OK

    REPLACE ECM

    Click here

    NG

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