Sfi System - Ecm Power Source Circuit

Brand:

Toyota

Model Name:

Camry ACV40 GSV40

Manual:

Repair Manual

Section:

2Az-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Check harness and connector (ecm - body ground)

  5. Inspect engine room j/b (efi relay voltage)

  6. Inspect fuse (efi main fuse)

  7. Inspect engine room j/b (efi relay)

  8. Inspect fuse (efi no. 2 fuse)

  9. Check harness and connector (efi relay - ecm)

  10. Inspect ecm (igsw voltage)

  11. Inspect fuse (ign fuse)

  12. Inspect ignition relay no. 2

  13. Check harness and connector (ig2 relay - body ground)

  14. Inspect ignition switch assembly

  15. Check harness and connector (efi relay - ecm, efi relay - body ground)

SFI SYSTEM > ECM Power Source Circuit


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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


Sfi System - P0340(2007/12 - 2009/01) Camry


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
  1. Disconnect the C24 ECM connector. Camry

  2. 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.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK
next down

2.INSPECT ENGINE ROOM J/B (EFI RELAY VOLTAGE)
  1. Remove the engine room J/B from the engine room R/B. Camry

  2. 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.



OKnext
Go to step 4
NG
next down

3.INSPECT FUSE (EFI MAIN FUSE)
  1. Inspect the EFI MAIN fuse.Remove the EFI MAIN fuse from the engine room R/B.Measure the EFI MAIN fuse resistance.Standard resistance:Below 1 ΩReinstall the EFI MAIN fuse. Camry

  2. 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.



NGnext
REPLACE FUSE (EFI MAIN FUSE)
OK
next down
CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - EFI RELAY)

4.INSPECT ENGINE ROOM J/B (EFI RELAY)
  1. Remove the engine room J/B from the engine room R/B. Camry

  2. 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.



NGnext
REPLACE ENGINE ROOM J/B
OK
next down

5.INSPECT FUSE (EFI NO. 2 FUSE)
  1. Inspect the EFI No. 2 fuse.Remove the EFI No. 2 fuse from the engine room R/B.Measure the EFI No. 2 fuse resistance.Standard resistance:Below 1 ΩReinstall the EFI No. 2 fuse. Camry

  2. 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.



NGnext
REPLACE FUSE (EFI NO. 2 FUSE)
OK
next down

6.CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM)
  1. Disconnect the A24 ECM connector. Camry

  2. Disconnect the A24 ECM connector.

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

  2. 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.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

7.INSPECT ECM (IGSW VOLTAGE)
  1. Disconnect the A24 and C24 ECM connectors. Camry

  2. 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.



OKnext
Go to step 12
NG
next down

8.INSPECT FUSE (IGN FUSE)
  1. Remove the IGN fuse from the instrument panel J/B. Camry

  2. 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.



Bnext
Go to step 11

Cnext
REPLACE FUSE (IGN FUSE)
A
next down

9.INSPECT IGNITION RELAY NO. 2
  1. Remove the IG2 relay from the engine room R/B. Camry

  2. 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.



NGnext
REPLACE IGNITION RELAY NO. 2
OK
next down

10.CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)
  1. Remove the IG2 relay from the engine room R/B. Camry

  2. 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.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

11.INSPECT IGNITION SWITCH ASSEMBLY
  1. Disconnect the E23 ignition switch connector. Camry

  2. 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.



NGnext
REPLACE IGNITION SWITCH ASSEMBLY
OK
next down
REPAIR OR REPLACE HARNESS OR CONNECTOR

12.CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND)
  1. Disconnect the A24 ECM connector. Camry

  2. Disconnect the A24 ECM connector.

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

  2. 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.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE ECM