Sfi System Ecm Power Source Circuit

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ENGINE ROOM J/B (EFI RELAY VOLTAGE)

INSPECT FUSE (EFI MAIN FUSE)

INSPECT ENGINE ROOM J/B (EFI RELAY)

INSPECT FUSE (EFI NO. 2 FUSE)

CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM)

INSPECT ECM (IGSW VOLTAGE)

INSPECT FUSE (IGN FUSE)

INSPECT IGNITION RELAY NO. 2

CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)

INSPECT IGNITION SWITCH ASSEMBLY

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

SFI SYSTEM - ECM Power Source Circuit


DESCRIPTION

When the ignition switch is turned to the ON position, the battery voltage is applied to IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the engine room J/B (EFI relay) and supplying power to either terminal +B or +B2 of the ECM.

WIRING DIAGRAM


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit


INSPECTION PROCEDURE

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


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the C24 ECM connector.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E1 (C24-104) - Body ground
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK


2.INSPECT ENGINE ROOM J/B (EFI RELAY VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the engine room J/B from the engine room R/B.

  1. Disconnect the 1E engine room J/B connector.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the terminals.

    Standard voltage:
    Tester Connection
    		Specified Condition
    1E-12 - Body ground
    		9 to 14 V

  1. Reconnect the engine room J/B connector.

  1. Reinstall the engine room J/B.



OK
Go to step 4
NG


3.INSPECT FUSE (EFI MAIN FUSE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Inspect the EFI MAIN fuse.

    1. Remove the EFI MAIN fuse from the engine room R/B.

    2. Measure the EFI MAIN fuse resistance.

      Standard resistance:
      Below 1 Ω

    3. Reinstall the EFI MAIN fuse.



NG
REPLACE FUSE (EFI MAIN FUSE)
OK

CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - EFI RELAY)

4.INSPECT ENGINE ROOM J/B (EFI RELAY)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the engine room J/B from the engine room R/B.

  1. Inspect the EFI relay.

    1. Measure the EFI relay resistance.

      Standard resistance:
      Tester Connection
      		Specified Condition
      1E-6 - 1E-12
      		10 kΩ or higher
      Below 1 Ω
      (Apply battery voltage between terminals 1E-9 and 1E-11)

  1. Reinstall the engine room J/B.



NG
REPLACE ENGINE ROOM J/B
OK


5.INSPECT FUSE (EFI NO. 2 FUSE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Inspect the EFI No. 2 fuse.

    1. Remove the EFI No. 2 fuse from the engine room R/B.

    2. Measure the EFI No. 2 fuse resistance.

      Standard resistance:
      Below 1 Ω

    3. Reinstall the EFI No. 2 fuse.



NG
REPLACE FUSE (EFI NO. 2 FUSE)
OK


6.CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the A24 ECM connector.



    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the engine room J/B from the engine room R/B.

  1. Disconnect the 1E engine room J/B connector.

  1. Measure the resistance between the terminals.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    +B (A24-2) - 1E-6
    		Below 1 Ω
    +B2 (A24-1) - 1E-6
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    +B (A24-2) or 1E-6 - Body ground
    		10 kΩ or higher
    +B2 (A24-1) or 1E-6 - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the engine room J/B connector.

  1. Reinstall the engine room J/B.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT ECM (IGSW VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the A24 and C24 ECM connectors.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the terminals of the A24 and C24 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    IGSW (A24-28) - E1 (C24-104)
    		9 to 14 V

  1. Reconnect the ECM connectors.



OK
Go to step 12
NG


8.INSPECT FUSE (IGN FUSE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the IGN fuse from the instrument panel J/B.

  1. Measure the fuse resistance.

    Standard resistance:
    Below 1 Ω
    Result:
    Result
    		Proceed to
    OK (RHD)
    		A
    OK (LHD)
    		B
    NG
    		C

  1. Reinstall the fuse.



B
Go to step 11

C
REPLACE FUSE (IGN FUSE)
A


9.INSPECT IGNITION RELAY NO. 2


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the IG2 relay from the engine room R/B.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    Below 1 Ω
    (Apply battery voltage between terminals 1 and 2)

  1. Reinstall the IG2 relay.



NG
REPLACE IGNITION RELAY NO. 2
OK


10.CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the IG2 relay from the engine room R/B.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Specified Condition
    IG2 relay terminal 2 - Body ground
    		Below 1 Ω

  1. Reinstall the IG2 relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.INSPECT IGNITION SWITCH ASSEMBLY


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the E23 ignition switch connector.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Ignition Switch Position
    		Specified Condition
    All Terminals
    		LOCK
    		10 kΩ or higher
    2 - 4
    		ACC
    		Below 1 Ω
    1 - 2 - 4, 5 - 6
    		ON
    1 - 3 - 4, 5 - 6 - 7
    		START

  1. Reconnect the ignition switch connector.



NG
REPLACE IGNITION SWITCH ASSEMBLY
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the A24 ECM connector.



    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the engine room J/B from the engine room R/B.

  1. Disconnect the 1E engine room J/B connector.

  1. Measure the resistance between the terminals.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    MREL (A24-44) - 1E-9
    		Below 1 Ω
    1E-11 - Body ground
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    MREL (A24-44) or 1E-9 - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the engine room J/B connector.

  1. Reinstall the engine room J/B.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM