Ecd System Air Conditioning Cut Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

INSPECT ECM (ACT VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - AIR CONDITIONING AMPLIFIER)

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


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Air Conditioning Cut Control Circuit


INSPECTION PROCEDURE

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

  1. Connect the GTS to the DLC3.

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

    HINT:
    The A/C magnetic clutch is turned on.

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

  1. 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.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000VQC00UX.html)

2.INSPECT ECM (ACT VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Air Conditioning Cut Control Circuit

  1. Start the engine.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G183-9 (ACT) - Body ground
    		Engine idling
    		11 to 14 V
    G183-9 (ACT) - Body ground
    		Ignition switch ON, engine stopped
    		0 to 3 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 3
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)

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

  1. Disconnect the A/C amplifier connector.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G25-27 (ACT) - G183-9 (ACT)
    		Always
    		Below 1 Ω
    G25-27 (ACT) or G183-9 (ACT) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the A/C amplifier connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER (LandCruiser RM0000039R5028X.html)