СИСТЕМА ECD > Air Conditioning Signal Circuit

для подготовки Нажмите здесь


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


A0095ZXE03


INSPECTION PROCEDURE


When using intelligent tester:

1.READ VALUE USING INTELLIGENT TESTER (AIR CONDITIONING SIGNAL)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the A/C switch on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / A/C SIG.

    Result:
    Switch Condition
    		A/C SIG
    A/C switch off
    		OFF
    A/C switch on
    		ON



NG
Перейдите к шагу 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Нажмите здесь)  

2.CHECK ECM (AC1 VOLTAGE)


    A009AF3E99

  1. Start the engine.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G62-2 (AC1) - Body ground
    		A/C switch on
    		Below 1.5 V
    G62-2 (AC1) - Body ground
    		A/C switch off
    		7.5 to 14 V

    Text in Illustration 
    *a
    		Component with harness connected
    (ECM)



NG
Перейдите к шагу 3
OK

REPLACE ECM (Нажмите здесь)  

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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G25-17 (AC1) - G62-2 (AC1)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G25-17 (AC1) or G62-2 (AC1) - 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 (Нажмите здесь)  


When not using intelligent tester:

1.CHECK ECM (AC1 VOLTAGE)


    A009AF3E99

  1. Start the engine.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G62-2 (AC1) - Body ground
    		A/C switch on
    		Below 1.5 V
    G62-2 (AC1) - Body ground
    		A/C switch off
    		7.5 to 14 V

    Text in Illustration 
    *a
    		Component with harness connected
    (ECM)



NG
Перейдите к шагу 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Нажмите здесь)  

2.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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G25-17 (AC1) - G62-2 (AC1)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G25-17 (AC1) or G62-2 (AC1) - 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 (Нажмите здесь)