ECD SYSTEM Air Conditioning Cut Control Circuit

DESCRIPTION

This circuit cuts air conditioning operation during vehicle acceleration in order to increase acceleration performance. During acceleration with the vehicle speed at 30 km/h (19 mph) or less and the accelerator pedal opening angle at 45° or more, the A/C magnetic switch is turned off for several seconds.

The air conditioning is also controlled using the engine coolant temperature output from the ECM to the A/C amplifier.

WIRING DIAGRAM

A01DLUSE04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (CHECK OPERATION OF AIR CONDITIONING CUT CONTROL)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the air conditioning switch on.

      Tech Tips

      The A/C magnetic clutch is turned on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / A/C Cut SIG.

    4. Check operation of the A/C magnetic clutch cut when air conditioning cut control is operated by the intelligent tester.

      OK
      A/C magnetic clutch is turned off.

    NG

    INSPECT ECM (ACT VOLTAGE) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. INSPECT ECM (ACT VOLTAGE)


    1. A01DQ34E02
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Start the engine.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      G62-8 (ACT) - Body ground Engine idling 11 to 14 V
      G62-8 (ACT) - Body ground Ignition switch ON, engine stopped 0 to 3 V

    NG

    CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER) Click here

    OK

    REPLACE ECM Click here

  3. CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER)


    1. Disconnect the A/C amplifier 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
      G25-27 (ACT) - G62-8 (ACT) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G25-27 (ACT) or G62-8 (ACT) - Body ground Always 10 kΩ or higher

    4. Reconnect the A/C amplifier connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here