Sfi System Ecm Power Source Circuit

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT INTEGRATION RELAY (POWER SOURCE)

INSPECT FUSES (EFI MAIN, IG2, AND EFI NO. 1 FUSES)

INSPECT INTEGRATION RELAY (EFI MAIN RELAY AND IG2 RELAY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ECM (IGSW TERMINAL VOLTAGE)

INSPECT FUSE (IGN FUSE)

CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY)

INSPECT FUSE (IG2 NO. 2 FUSE)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH)

INSPECT IGNITION SWITCH

SFI SYSTEM - ECM Power Source Circuit


DESCRIPTION

When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the EFI MAIN relay coil, closing the EFI MAIN relay contacts and supplying power to terminals +B and +B2 of the ECM.

WIRING DIAGRAM


Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit


INSPECTION PROCEDURE

1.INSPECT INTEGRATION RELAY (POWER SOURCE)
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1E-1 - Body ground
    		Always
    		11 to 14 V

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - BATTERY)
OK


2.INSPECT FUSES (EFI MAIN, IG2, AND EFI NO. 1 FUSES)
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the EFI MAIN fuse, IG2 fuse and EFI No. 1 fuse from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    EFI MAIN fuse
    		Always
    		Below 1 Ω
    IG2 fuse
    EFI No. 1 fuse

  1. Reinstall the fuses.



NG
REPLACE FUSE (EFI MAIN, IG2 OR EFI NO. 1 FUSE)
OK


3.INSPECT INTEGRATION RELAY (EFI MAIN RELAY AND IG2 RELAY)

  1. Inspect the integration relay (COROLLA_ZRE142 RM0000033DY011X.html).



NG
REPLACE INTEGRATION RELAY (COROLLA_ZRE142 RM0000033DZ010X.html)
OK


4.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay 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
    A50-44 (MREL) - 1B-2
    		Always
    		Below 1 Ω
    A50-2 (+B) - 1B-4
    		Always
    		Below 1 Ω
    A50-1 (+B2) - 1B-4
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    A50-44 (MREL) or 1B-2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - ECM)
OK


5.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay connector.

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


Standard Resistance (Check for Open):

Tester Condition
Condition
Specified Condition
1A-3 - Body ground
Always
Below 1 Ω
1B-3 - Body ground
Always
Below 1 Ω

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



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


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

  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
    B31-104 (E1) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.



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


7.INSPECT ECM (IGSW TERMINAL VOLTAGE)
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. Disconnect the ECM connectors.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A50-28 (IGSW) - B31-104 (E1)
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the ECM connectors.



NG
Go to step 8
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)

8.INSPECT FUSE (IGN FUSE)
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the IGN fuse from the instrument panel junction block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    IGN fuse
    		Always
    		Below 1 Ω

  1. Reinstall the IGN fuse.



NG
REPLACE FUSE (IGN FUSE)
OK


9.CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY)

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay 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
    A50-28 (IGSW) - 1A-4
    		Always
    		Below 1 Ω

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - INTEGRATION RELAY)
OK


10.INSPECT FUSE (IG2 NO. 2 FUSE)
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

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

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    IG2 No. 2 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the fuse.



NG
REPLACE FUSE (IG2 NO. 2 FUSE)
OK


11.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH)

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay connector.

  1. Disconnect the ignition switch connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    1A-2 - E4-6 (IG2)
    		Always
    		Below 1 Ω

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the ignition switch connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH)
OK


12.INSPECT IGNITION SWITCH

  1. Inspect the ignition switch (COROLLA_ZRE142 RM0000026VF01LX.html).



NG
REPLACE IGNITION SWITCH (COROLLA_ZRE142 RM0000034SW00YX.html)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)