ECD SYSTEM 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

B003O3JE08
*1 A/C ECU

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 and ECT > 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. B003KN0C83
      *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
      G160-34 (AC1) - Body ground Engine idling 11 to 14 V
      G160-34 (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
      Tester Connection Condition Specified Condition
      G37-17 (AC1) - G160-34 (AC1) Always Below 1 Ω
      G37-17 (AC1) or G160-34 (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