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.

B002E1BE08
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 cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) circuit

  • Air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV))

  • NO. 1 integration relay

  • ECM

 Comes on DTC stored

WIRING DIAGRAM

B002DO3E05

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)

    B002EGQC01
    *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 vaccum hope (port F) from the air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)).

    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 AICS.


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

    6. Check the operation of the air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) when the air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) 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 AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))


    1. Inspect the air cleaner case sub-assembly (vacuum switching valve assembly (for AICV))

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR CLEANER CASE SUB-ASSEMBLY (VACCUM SWITHING VALVE ASSEMBLY (FOR AICV))

    B002CL3C51
    *a

    Front view of wire harness connector

    (to Air Cleaner Case Sub-assembly (Vaccum Swithing Valve Assembly (For AICV))

    1. Disconnect the air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) 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
      A27-2 - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AIR CLEANER CASE SUB-ASSEMBLY (VACCUM SWITHING VALVE ASSEMBLY (FOR AICV)) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CLEANER CASE SUB-ASSEMBLY (VACCUM SWITHING VALVE ASSEMBLY (FOR AICV)) - ECM)


    1. Disconnect the A27 air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) connector.

    2. Disconnect the E1 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-1 - E1-7 (AICV) Always Below 1 Ω
      A27-1 or E1-7 (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 (NO. 1 INTEGRATION RELAY - AIR CLEANER CASE SUB-ASSEMBLY (VACCUM SWITHING VALVE ASSEMBLY (FOR AICV))


    1. Remove the No. 1 integration relay the No. 2 engine room relay block.

    2. Disconnect the A27 air cleaner case sub-assembly (vaccum swithing valve assembly (for AICV)) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2E-14 - A27-2 Always Below 1 Ω
      2E-14 or A27-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO.1 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR