SFI SYSTEM(w/ Canister Pump Module) ECM Power Source Circuit

DTC Code DTC Name
ECM Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A378115E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (IG2 RELAY VOLTAGE)

    A375543C01

    *1

    Engine Room Relay Block and Junction Block Assembly

    *2

    IG2 Relay

    1. Remove the IG2 relay from the engine room relay block and junction block assembly.

    2. Turn the power switch on (IG).

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      1 (IG2 relay) - Body ground

      Power switch on (IG)

      11 to 14 V

      Result

      Proceed to

      OK

      NG
    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 RELAY)Click here

    OK

  2. INSPECT IG2 RELAY

    1. Inspect the IG2 relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE IG2 RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - IG2 RELAY)

    A375543C01

    *1

    Engine Room Relay Block and Junction Block Assembly

    *2

    IG2 Relay

    1. Remove the IG2 relay from the engine room relay block and junction block assembly.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      3 (IG2 relay) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)

    1. Remove the IG2 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (IG2 relay) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (IG2 RELAY - ECM)

    1. Remove the IG2 relay from the engine room relay block and junction block assembly.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      5 (IG2 relay) - A62-37 (IGSW)

      Always

      Below 1 Ω

      5 (IG2 relay) or A62-37 (IGSW) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT EFI-MAIN RELAY

    1. Inspect the EFI-MAIN relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE EFI-MAIN RELAY

    OK

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

    A375544C01

    *1

    Engine Room Relay Block and Junction Block Assembly

    *2

    EFI-MAIN Relay

    1. Remove the EFI-MAIN relay from the engine room relay block and junction block assembly.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      5 (EFI-MAIN relay) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    1. Remove the EFI-MAIN relay from the engine room relay block and junction block assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2 (EFI-MAIN relay) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - ECM)

    1. Remove the EFI-MAIN relay from the engine room relay block and junction block assembly.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 (EFI-MAIN relay) - A62-2 (+B)

      Always

      Below 1 Ω

      3 (EFI-MAIN relay) - A62-3 (+B2)

      Always

      Below 1 Ω

      1 (EFI-MAIN relay) - A62-46 (MREL)

      Always

      Below 1 Ω

      3 (EFI-MAIN relay) or A62-2 (+B) - Body ground and other terminals

      Always

      10 kΩ or higher

      3 (EFI-MAIN relay) or A62-3 (+B2) - Body ground and other terminals

      Always

      10 kΩ or higher

      1 (EFI-MAIN relay) or A62-46 (MREL) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. 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

      Tester Connection

      Condition

      Specified Condition

      B75-16 (E1) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 RELAY)

    1. Disconnect the Certification ECU (smart key ECU assembly) connector.

    2. Remove the IG2 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G82-9 (IG2D) - 1 (IG2 relay)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR