СИСТЕМА ECD Air Conditioning Signal Circuit

DESCRIPTION

When the A/C compressor is on, the A/C amplifier sends the A/C signal to the ECM and the ECM increases the fuel injection volume to improve driveability during engine idling.

WIRING DIAGRAM

A01SDLME05

PROCEDURE


  1. READ VALUE USING ECM


    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 / Control 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


    1. B0024F5C88
      *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 Switch Condition Specified Condition
      G120-34 (AC1) - Body ground Engine idling 11 to 14 V
      G120-34 (AC1) - 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
      G34-2 (AC1) - G120-34 (AC1) Always Below 1 Ω
      G34-2 (AC1) or G120-34 (AC1) - 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
      G77-12 (AC1) - G120-34 (AC1) Always Below 1 Ω
      G77-12 (AC1) or G120-34 (AC1) - 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