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 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 by the ECM outputting the engine coolant temperature to the air conditioning amplifier asembly.

WIRING DIAGRAM

A003D6EE06

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING GTS (CHECK OPERATION AIR CONDITIONER CUT CONTROL)


    1. Connect the GTS to the DLC3.

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

      Tech Tips

      A/C magnetic clutch is turned on.

    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the A/C cut signal and read its value displayed on the GTS.

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

      OK
      A/C magnet clutch is turned OFF.

    NG

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

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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


    1. Disconnect the air conditioning amplifier 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
      H19-10 (ACT) - B74-15 (ACT) Always Below 1 Ω
      H19-10 (ACT) or B74-15 (ACT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY (CHECK VOLTAGE)


    1. A003ECCE02
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Start the engine.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H19-10 (ACT) - Body ground A/C compressor ON 10 to 14 V
      H19-10 (ACT) - Body ground A/C compressor OFF Below 1.0 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE ECM Click here