SFI SYSTEM ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned 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 relay coil, closing the EFI relay contacts and supplying power to terminal +B of the ECM.

WIRING DIAGRAM

A0118W7E01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. INSPECT INTEGRATION NO.1 RELAY (POWER SOURCE VOLTAGE)

    A0118KFE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Integration Relay)

    1. Remove the integration relay.

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

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

    3. Reinstall the integration relay.


    NG

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

    OK

  2. INSPECT INTEGRATION NO.1 RELAY (EFI RELAY AND IG2 RELAY)

    A0119FDE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Integration Relay)

    1. Remove the integration relay.

    2. Inspect the relay


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        1A-1 - 1B-4 or 1B-10 Battery voltage not applied 10 kΩ or higher
        Battery voltage applied to terminals 1B-2 and 1C-3 Below 1 Ω
        1A-1 - 1B-7 Battery voltage not applied 10 kΩ or higher
        Battery voltage applied to terminals 1C-3 and 1D-11 Below 1 Ω

    3. Reinstall the integration relay.


    NG

    REPLACE INTEGRATION NO.1 RELAY Click here

    OK

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


    1. Remove the integration relay.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A18-44 (MREL) - 1B-2 Always Below 1 Ω
      A18-2 (+B) - 1B-10 Always Below 1 Ω
      A18-1 (+B2) - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-44 (MREL) or 1B-2 - Body ground Always 10 kΩ or higher
      A18-2 (+B) or 1B-10 - Body ground Always 10 kΩ or higher
      A18-1 (+B2) or 1B-4 - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B8-105 (E1) - Body ground Always Below 1 Ω

    3. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT ECM (IGSW TERMINAL VOLTAGE)

    A011B3FE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to ECM)
    *2

    Front view of wire harness connector

    (to ECM)

    1. Disconnect the ECM connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A18-27 (IGSW) - B8-105 (E1) Ignition switch ON 11 to 14 V

    4. Reconnect the ECM connectors.

      Result
      Result Proceed to
      Outside standard range A
      Within standard range B

    B

    REPLACE ECM Click here

    A

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


    1. Remove the integration relay.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A18-27 (IGSW) - 1B-7 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-27 (IGSW) or 1B-7 - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect the ECM connector.

      Result
      Result Proceed to
      Outside normal range A
      Within normal range (w/ Entry and Start System) B
      Within normal range (w/o Entry and Start System) C

    B

    CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU - BODY GROUND) Click here

    C

    CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH - BODY GROUND) Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. Remove the integration relay.

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1D-11 - D36-8 (IG2D) Always Below 1 Ω
      1C-3 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1D-11 or D36-8 (IG2D) - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ENTRY AND START SYSTEM Click here

  8. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - IGNITION SWITCH - BODY GROUND)


    1. Remove the integration relay.

    2. Disconnect the ignition switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1D-11 - D28-6 (IG2) Always Below 1 Ω
      1C-3 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1D-11 or D28-6 (IG2) - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay.

    5. Reconnect the ignition switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT IGNITION SWITCH ASSEMBLY

    A011B1DE02

    1. Remove the ignition assembly switch.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      - LOCK 10 kΩ or higher
      2 - 3 ACC Below 1 Ω
      2 - 3- 4 ON
      6 - 7
      1 - 2- 4 START
      6 - 7 - 8 (*1)

      *1: for CVT

    3. Reinstall the ignition switch assembly.


    NG

    REPLACE IGNITION SWITCH ASSEMBLY Click here

    OK

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