СИСТЕМА SFI > Цепь питания ECM

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DESCRIPTION

When the engine switch is turned on (IG), the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI MAIN2 relay and supplying power to terminal +B and +B1 of the ECM.
If the engine switch is turned off, the ECM holds the EFI MAIN2 relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
When the engine switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the integration relay (EFI MAIN2 relay). This causes the contacts of the integration relay (EFI MAIN2 relay) to close, which supplies power to terminal +B and +B1 of the ECM.

WIRING DIAGRAM


A147872E02


INSPECTION PROCEDURE

1.INSPECT ECM (+B, +B2 VOLTAGE)


    A124678E28

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A13-2 (+B) - E3-1 (E1)
    		Engine switch on (IG)
    		11 to 14 V
    A13-1 (+B1) - E3-1 (E1)
    		Engine switch on (IG)
    		11 to 14 V



OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Нажмите здесь)
NG


2.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)


    A150157E05

  1. Disconnect the E3 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
    E3-1 (E1) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT ECM (IGSW VOLTAGE)


    A124678E29

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A14-8 (IGSW) - E3-1 (E1)
    		Engine switch on (IG)
    		11 to 14 V



OK
Перейдите к шагу 6
NG


4.CHECK FUSE (ECU-IG)


    A152205E01

  1. Remove the ECU-IG fuse from the engine room No. 2 junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ECU-IG fuse
    		Always
    		Below 1 Ω



NG
CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK


5.INSPECT IGNITION RELAY NO. 2


    A035654E01

  1. Remove the IG2 relay from the engine room No. 2 junction block.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		When no battery voltage applied to terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		When battery voltage applied to terminals 1 and 2
    		Below 1 Ω



NG
REPLACE IGNITION RELAY NO. 2
OK

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (Нажмите здесь)  

6.INSPECT ECM (MREL VOLTAGE)


    A124678E30

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A14-3 (MREL) - E3-1 (E1)
    		Engine switch on (IG)
    		11 to 14 V



NG
REPLACE ECM (Нажмите здесь)
OK


7.CHECK FUSE (EFI MAIN NO. 2)


    A152206E02

  1. Remove the EFI MAIN2 fuse from the engine room No. 2 relay block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    EFI MAIN2 fuse
    		Always
    		Below 1 Ω



NG
CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK


8.INSPECT EFI MAIN2 RELAY


    B016200E02

  1. Remove the integration relay from the engine room No. 2 relay block.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		When no battery voltage applied to terminals 1 and 2
    		10 kΩ or higher
    When battery voltage applied to terminals 1 and 2
    		Below 1 Ω



NG
REPLACE EFI MAIN2 RELAY
OK


9.CHECK HARNESS AND CONNECTOR (EFI MAIN2 RELAY- ECM, EFI MAIN2 RELAY - BODY GROUND)


    A152207E01

  1. Check the harness and the connectors between the integration relay and the ECM.

    1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.

    2. Disconnect the A14 ECM connector.

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

      Standard resistance (Check for open):
      Tester Connection
      		Condition
      		Specified Condition
      EFI MAIN2 (1) - A14-3 (MREL)
      		Always
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connection
      		Condition
      		Specified Condition
      EFI MAIN2 (1) or A14-3 (MREL) - Body ground
      		Always
      		10 kΩ or higher

  1. Check the harness and the connectors between the EFI MAIN2 relay and body ground.

    1. Remove the EFI MAIN2 relay from the engine room No. 2 relay block.

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

      Standard resistance (Check for open):
      Tester Connection
      		Condition
      		Specified condition
      EFI MAIN2 (2) - Body ground
      		Always
      		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK AND REPAIR HARNESS OR CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)