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

A01SDLME07

PROCEDURE


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


    1. Connect the GTS 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 / Comtrol the A/C Cut Signal


      Powertrain > Engine > Active Test
      Tester Display
      Control the A/C Cut Signal

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

      OK
      A/C magnetic clutch is turned off.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT ECM (ACT VOLTAGE)


    1. B0024F5C89
      *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
      G121-9 (ACT) - Body ground Engine idling 11 to 14 V
      G121-9 (ACT) - Body ground Ignition switch ON,engine stopped 0 to 3 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

  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
      for w/ Air Conditioner w/o PTC Heater, w/ Cooler
      Tester Connection Condition Specified Condition
      G34-4 (ACT) - G121-9 (ACT) Always Below 1 Ω
      G34-4 (ACT) or G121-9 (ACT) - Body ground and other terminals Always 10 kΩ or higher
      for w/ Air Conditioner w/ PTC Heater, w/o Air Conditioner w/ PTC Heater
      Tester Connection Condition Specified Condition
      G77-18 (ACT) - G121-9 (ACT) Always Below 1 Ω
      G77-18 (ACT) or G121-9 (ACT) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR