Sfi System Ecm Power Source Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ECM (IGSW VOLTAGE)

INSPECT FUSE (EFI MAIN FUSE)

INSPECT FUSE (EFI NO. 1 FUSE)

INSPECT INTEGRATION RELAY (EFI MAIN RELAY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN RELAY) - ECM)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN RELAY) - BATTERY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN RELAY) - BODY GROUND)

INSPECT FUSE (IGN FUSE)

INSPECT FUSE (IG2 FUSE)

INSPECT INTEGRATION RELAY (IG2 RELAY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - ECM)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - BATTERY)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - BODY GROUND)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - IGNITION SWITCH ASSEMBLY)

INSPECT IGNITION SWITCH ASSEMBLY

INSPECT FUSE (AM2 NO. 2 FUSE)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY))

INSPECT FUSE (AM2 NO. 2 FUSE)

CHECK HARNESS AND CONNECTOR (AM2 VOLTAGE)

SFI SYSTEM - ECM Power Source Circuit


DESCRIPTION

When the ignition switch is turned to the ON, 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 integration relay (EFI MAIN relay) and supplying power to either terminals +B and +B2 of the ECM.

WIRING DIAGRAM


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


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


INSPECTION PROCEDURE

1.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:

    Tester Connection
    		Condition
    		Specified Condition
    B31-105 (E1) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.



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


2.INSPECT ECM (IGSW VOLTAGE)


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

  1. Disconnect the ECM connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A50-27 (IGSW) - Body ground
    		Ignition switch ON
    		11 to 14 V

  1. Reconnect the ECM connector.



NG
Go to step 9
OK


3.INSPECT FUSE (EFI MAIN FUSE)


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

  1. Remove the EFI MAIN 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

  1. Reinstall the EFI MAIN fuse.



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


4.INSPECT FUSE (EFI NO. 1 FUSE)


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

  1. Remove the 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 No. 1 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the EFI No. 1 fuse.



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


5.INSPECT INTEGRATION RELAY (EFI MAIN RELAY)

  1. Inspect the integration relay (EFI MAIN relay) (COROLLA_ZRE142 RM000001CMR04AX.html).



NG
REPLACE INTEGRATION RELAY (EFI MAIN RELAY) (COROLLA_ZRE142 RM000001CMT05PX.html)
OK


6.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN 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
    1B-4 - A50-1 (+B2)
    		Always
    		Below 1 Ω
    1B-4 - A50-2 (+B)
    		Always
    		Below 1 Ω
    1B-2 - A50-44 (MREL)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    1B-4 or A50-1 (+B2) - Body ground
    		Always
    		10 kΩ or higher
    1B-4 or A50-2 (+B) - Body ground
    		Always
    		10 kΩ or higher
    1B-2 or A50-44 (MREL) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



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


7.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN RELAY) - BATTERY)

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

  1. Disconnect the integration relay connector.

  1. Disconnect the negative battery terminal.

  1. Disconnect the positive battery terminal.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    1E-1 - Battery positive terminal
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    1E-1 or Battery positive terminal - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the positive battery terminal.

  1. Reconnect the negative battery terminal.



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


8.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI MAIN 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:

    Tester Connection
    		Condition
    		Specified Condition
    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 (EFI MAIN RELAY) - BODY GROUND)
OK

PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000000PDG0P3X.html)

9.INSPECT FUSE (IGN FUSE)


    Corolla. Zre142 Aze141.2Zr-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
CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK


10.INSPECT FUSE (IG2 FUSE)


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

  1. Remove the IG2 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 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the IG2 fuse.



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


11.INSPECT INTEGRATION RELAY (IG2 RELAY)

  1. Inspect the integration relay (IG2 relay) (COROLLA_ZRE142 RM000001CMR04AX.html).



NG
REPLACE INTEGRATION RELAY (IG2 RELAY) (COROLLA_ZRE142 RM000001CMT05PX.html)
OK


12.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - ECM)

  1. Disconnect the ECM connector.

  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 Connection
    		Condition
    		Specified Condition
    1A-4 - A50-27 (IGSW)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    1A-4 or A50-27 (IGSW) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - ECM)
OK


13.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - BATTERY)

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

  1. Disconnect the integration relay connector.

  1. Disconnect the negative battery terminal.

  1. Disconnect the positive battery terminal.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    1E-1 - Battery positive terminal
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    1E-1 or Battery positive terminal - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the positive battery terminal.

  1. Reconnect the negative battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - BATTERY)
OK


14.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 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:

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

    Result:

    Result
    		Proceed to
    OK (w/o smart key system)
    		A
    OK (w/ smart key system)
    		B
    NG
    		C

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



B
Go to step 18

C
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - BODY GROUND)
A


15.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - IGNITION SWITCH ASSEMBLY)

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

  1. Disconnect the integration relay connector.

  1. Disconnect the ignition switch assembly 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

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    1A-2 or E4-6 (IG2) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the ignition switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - IGNITION SWITCH ASSEMBLY)
OK


16.INSPECT IGNITION SWITCH ASSEMBLY

  1. Inspect the ignition switch assembly (COROLLA_ZRE142 RM0000026VF01KX.html).



NG
REPLACE IGNITION SWITCH ASSEMBLY (COROLLA_ZRE142 RM0000034SX011X.html)
OK


17.INSPECT FUSE (AM2 NO. 2 FUSE)


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

  1. Remove the AM2 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
    AM2 No. 2 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the AM2 No. 2 fuse.



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

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

18.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY))

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

  1. Disconnect the integration relay connector.

  1. Disconnect the main body ECU connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    E51-5 (IG2D) - 1A-2
    		Always
    		Below 1 Ω

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the main body ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY))
OK


19.INSPECT FUSE (AM2 NO. 2 FUSE)


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

  1. Remove the AM2 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
    AM2 No. 2 fuse
    		Always
    		Below 1 Ω

  1. Reinstall the AM2 No. 2 fuse.



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


20.CHECK HARNESS AND CONNECTOR (AM2 VOLTAGE)


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

  1. Disconnect the main body ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E50-6 (AM2) - Body ground
    		Always
    		11 to 14 V

  1. Reconnect the main body ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - BATTERY)
OK

GO TO SMART KEY SYSTEM (COROLLA_ZRE142 RM000000YEF0FXX.html)