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

DTC Code DTC Name
ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, 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 NO. 1 relay, closing the contacts and supplying power to terminals +B and +B2 of the ECM.

WIRING DIAGRAM

A299783E01

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)

    1. A298898C03

      *1

      Engine Room Relay Block and Junction Block Assembly

      *2

      IG2 Relay

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

    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

      IG2 relay terminal 1 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Result

    Proceed to

    OK

    A

    NG (w/o Entry and Start System)

    B

    NG (w/ Entry and Start System)

    C
    B

    CHECK HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY)Click here

    C

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

    A

  2. CHECK HARNESS AND CONNECTOR (BATTERY - IG2 RELAY, EFI-MAIN NO. 1 RELAY)

    1. A298898C03

      *1

      Engine Room Relay Block and Junction Block Assembly

      *2

      IG2 Relay

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

    2. A296485C01

      *1

      Engine Room Relay Block and Junction Block Assembly

      *2

      EFI-MAIN NO. 1 Relay

      Remove the EFI-MAIN NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      IG2 relay terminal 3 - Body ground

      Always

      11 to 14 V

      EFI-MAIN NO. 1 relay terminal 5 - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT IG2 RELAY, EFI-MAIN NO. 1

    1. Inspect the IG2 relay.

      Click here

    2. Inspect the EFI-MAIN NO. 1 relay.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE IG2 RELAY OR EFI-MAIN NO. 1 RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (IG2 RELAY, EFI-MAIN NO. 1 RELAY - BODY GROUND)

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

    2. Remove the EFI-MAIN NO. 1 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

      IG2 relay terminal 2 - Body ground

      Always

      Below 1 Ω

      EFI-MAIN NO. 1 relay terminal 2 - 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, EFI-MAIN NO. 1 RELAY - ECM)

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

    2. Remove the EFI-MAIN NO. 1 relay from the engine room relay block and junction block assembly.

    3. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      IG2 relay terminal 5 - A62-37 (IGSW)

      Always

      Below 1 Ω

      EFI-MAIN NO. 1 relay terminal 3 - A62-2 (+B)

      Always

      Below 1 Ω

      EFI-MAIN NO. 1 relay terminal 3 - A62-3 (+B2)

      Always

      Below 1 Ω

      EFI-MAIN NO. 1 relay terminal 1 - A62-46 (MREL)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. 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

      B77-16 (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

  7. CHECK HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY)

    1. Disconnect the ignition switch assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G4-4 (AM2) - Body ground

      Always

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT IGNITION SWITCH ASSEMBLY

    1. Inspect the ignition switch assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

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

    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    Click here

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - IG2 RELAY)

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

    2. Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G82-9 (IG2D) - IG2 relay terminal 1

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ENTRY AND START SYSTEM

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR