SFI SYSTEM, Diagnostic DTC:P1660

DTC Code DTC Name
P1660 VSV for AICVS Circuit

DESCRIPTION

The air cleaner is equipped with 2 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 and the opening angle of the throttle valve is more than 60°, the ECM turns on the VSV to open the AICV.

A019JO4E01
DTC No. Detection Condition Trouble Area
P1660

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


  1. Voltage of terminal AICV 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

  • ECM

WIRING DIAGRAM

A019MB2E23

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


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


    NG

    REPLACE AIR CLEANER CASE

    OK

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VSV FOR AIR INTAKE CONTROL VALVE)


    1. A019PF0E26
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Vacuum Switching Valve for Air Intake Control Valve)

      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
      A14-1 - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the vacuum switching valve for air intake control valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - VSV FOR AIR INTAKE CONTROL VALVE)

    OK

  3. CHECK HARNESS AND CONNECTOR (VSV 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 (Check for Open)
      Tester Connection Condition Specified Condition
      A14-2 - D44-2 (AICV) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A14-2 or D44-2 (AICV) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the vacuum switching valve for air intake control valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM)

    OK

    REPLACE ECM Click here