Sfi System Ecm Power Source Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

CHECK ENGINE ROOM JUNCTION BLOCK (EFI RELAY VOLTAGE)

INSPECT EFI MAIN FUSE

CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - BATTERY)

INSPECT ENGINE ROOM JUNCTION BLOCK (EFI RELAY)

INSPECT EFI NO. 2 FUSE

CHECK HARNESS AND CONNECTOR (ECM - ENGINE ROOM JUNCTION BLOCK)

INSPECT ECM (IGSW VOLTAGE)

INSPECT IGNITION RELAY NO. 2

CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)

INSPECT IGNITION SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - 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 terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.
If the ignition switch is turned off, the ECM holds the EFI relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
When the ignition switch is turned to the ON position, voltage from the ECM's MREL terminal is applied to the engine room junction block (EFI relay). This causes the contacts of the engine room junction block (EFI relay) to close, which supplies power to terminal +B or +B2 of the ECM.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

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


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

  1. Disconnect the C58 (RHD) or C55 (LHD) ECM connector.

  1. Measure the resistance between the terminals.

    Standard resistance:
    RHD:
    Tester Connection
    		Specified Condition
    E1 (C58-81) - Body ground
    		Below 1 Ω
    LHD:
    Tester Connection
    		Specified Condition
    E1 (C55-81) - Body ground
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK ENGINE ROOM JUNCTION BLOCK (EFI RELAY VOLTAGE)


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

  1. Remove the engine room junction block from the engine room R/B.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the terminals.

    Standard voltage:
    Tester Connection
    		Specified Condition
    1E-6 - Body ground
    		9 to 14 V


OK
Go to step 5
NG


3.INSPECT EFI MAIN FUSE


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

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

  1. Measure the EFI MAIN fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the EFI MAIN fuse.



NG
REPLACE EFI MAIN FUSE
OK


Go to step 6

4.CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - BATTERY)


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

  1. Disconnect the negative battery terminal.

  1. Disconnect the positive battery terminal.

  1. Remove the engine room junction block from the engine room R/B.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Check for open:
    Tester Connection
    		Specified Condition
    1G-1 - Positive battery terminal
    		Below 1 Ω
    Check for short:
    Tester Connection
    		Specified Condition
    1G-1 or Positive battery terminal - Body ground
    		10 kΩ or higher

  1. Reinstall the engine room junction block.

  1. Reconnect the positive battery terminal.

  1. Reconnect the negative battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (CAMRY_ACV40 RM000000PDG07IX.html)

5.INSPECT ENGINE ROOM JUNCTION BLOCK (EFI RELAY)


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

  1. Remove the engine room junction block from the engine room R/B.

  1. Measure the resistance between the terminals.

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

  1. Reinstall the engine room junction block.



NG
REPLACE ENGINE ROOM JUNCTION BLOCK
OK


6.INSPECT EFI NO. 2 FUSE


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

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

  1. Measure the EFI No. 2 fuse resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the EFI No. 2 fuse.



NG
REPLACE EFI NO. 2 FUSE
OK


7.CHECK HARNESS AND CONNECTOR (ECM - ENGINE ROOM JUNCTION BLOCK)


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

  1. Disconnect the A24 (RHD) or A55 (LHD) ECM connector.

  1. Remove the engine room junction block from the engine room R/B.

  1. Measure the resistance between the terminals.

    Standard resistance (Check for open):
    RHD:
    Tester Connection
    		Specified Condition
    1E-6 - +B (A24-2)
    		Below 1 Ω
    1E-6 - +B2 (A24-1)
    		Below 1 Ω
    LHD:
    Tester Connection
    		Specified Condition
    1E-6 - +B (A55-2)
    		Below 1 Ω
    1E-6 - +B2 (A55-1)
    		Below 1 Ω

    Standard resistance (Check for open):
    RHD:
    Tester Connection
    		Specified Condition
    1E-6 or +B (A24-2) - Body ground
    		10 kΩ or higher
    1E-6 or +B2 (A24-1) - Body ground
    		10 kΩ or higher
    LHD:
    Tester Connection
    		Specified Condition
    1E-6 or +B (A55-2) - Body ground
    		10 kΩ or higher
    1E-6 or +B2 (A55-1) - Body ground
    		10 kΩ or higher

  1. Reinstall the engine room junction block.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT ECM (IGSW VOLTAGE)


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

  1. Disconnect the A24 (RHD) or A55 (LHD) ECM connector.

  1. Measure the voltage between the terminals.

    Standard voltage:
    RHD:
    Tester Connection
    		Specified Condition
    IGSW (A24-28) - Body ground
    		9 to 14 V
    LHD:
    Tester Connection
    		Specified Condition
    IGSW (A55-28) - Body ground
    		9 to 14 V

  1. Reconnect the ECM connector.



OK
Go to step 12
NG


9.INSPECT IGNITION RELAY NO. 2


    Camry. Acv40 Gsv40.2Gr-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
    3 - 5
    		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 Gsv40.2Gr-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.

    Result:
    Result
    		Proceed to
    OK
    		A
    NG
    		B


B
REPAIR OR REPLACE HARNESS OR CONNECTOR
A


11.INSPECT IGNITION SWITCH ASSEMBLY


    Camry. Acv40 Gsv40.2Gr-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 (ECM - BATTERY)

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


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

  1. Disconnect the A24 (RHD) or A55 (LHD) ECM connector.

  1. Measure the resistance between the terminals.

    Standard resistance:
    RHD:
    Tester Connection
    		Specified Condition
    MREL (A24-24) - Body ground
    		Below 1 Ω
    LHD:
    Tester Connection
    		Specified Condition
    MREL (A55-24) - Body ground
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (CAMRY_ACV40 RM0000022NT00OX.html)