SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P1660

DTC Code DTC Name
P1660 Air Bleed Control Circuit

DESCRIPTION

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range. When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm, the ECM activates VSV and opens the AICV.

B006843E08
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P1660 Air Bleed Control Circuit

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


  1. Voltage of terminal air intake control valve of the ECM is low when the VSV is off

  2. The engine has been started

  • Open or short in air intake control valve circuit

  • Air intake control valve

  • Semiconductor pwr integration ECU

  • ECM

 Comes on DTC stored

WIRING DIAGRAM

B0067PTE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following 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 AICS)

    B00679PC01
    *1 Air
    *2 Port E
    *3 Port F
    *4 Air Filter
    *a Vacuum Switching Valve is On
    *b Vacuum Switching Valve is Off

    1. Disconnect the vacuum hose (Port F) from the vacuum switching valve (for air intake control valve).

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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


      Powertrain > Engine > Active Test
      Tester Display
      Activate the VSV for AICS

    6. Check the operation of the vacuum switching valve (for air intake control valve) when the vacuum switching valve (for air intake control valve) is operated using the GTS.

      Standard
      GTS Connection Specified Condition
      ON Air from port E flows out through port F
      OFF Air from port E flows out through the air filter
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)


    1. Inspect the vacuum switching valve (for air intake control valve).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE))

    B0066XNC93
    *a

    Front view of wire harness connector

    (to Vacuum Switching Valve (for Air Intake Control Valve))

    1. Disconnect the vacuum switching valve (for air intake control valve) 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 Condition Specified Condition
      A4-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE)) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE) - ECM)


    1. Disconnect the vacuum switching valve (for air intake control valve) 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
      A4-1 (AIRV) - F1-7 (AICV) Always Below 1 Ω
      A4-1 (AIRV) or F1-7 (AICV) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - VACUUM SWITCHING VALVE (FOR AIR INTAKE CONTROL VALVE))


    1. Disconnect the semiconductor pwr integration ECU connector.

    2. Disconnect the vacuum switching valve (for air intake control valve) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2G-1 - A4-2 (+B) Always Below 1 Ω
      2G-1 or A4-2 (+B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR