SFI SYSTEM(w/o EGR System) 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

B002KMNE04

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-MAIN RELAY VOLTAGE)

    B002JWRC02
    *1 No. 1 Engine Room Relay Block and Junction Block Assembly
    *2 IG2-MAIN Relay

    1. Remove the IG2-MAIN relay from the No. 1 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-MAIN relay) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. INSPECT IG2-MAIN RELAY


    1. Inspect the IG2-MAIN relay.

      Click here

      Result
      Proceed to
      OK
      NG

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

    B002JWRC02
    *1 No. 1 Engine Room Relay Block and Junction Block Assembly
    *2 IG2-MAIN Relay

    1. Remove the IG2-MAIN relay from the No. 1 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-MAIN relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

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


    1. Remove the IG2-MAIN relay from the No. 1 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-MAIN relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

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


    1. Remove the IG2-MAIN relay from the No. 1 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-MAIN relay) - A35-37 (IGSW) Always Below 1 Ω
      5 (IG2-MAIN relay) or A35-37 (IGSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. INSPECT EFI-MAIN RELAY


    1. Inspect the EFI-MAIN relay.

      Click here

      Result
      Proceed to
      OK
      NG

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

    B002K39C01
    *1 No. 1 Engine Room Relay Block and Junction Block Assembly
    *2 EFI-MAIN Relay

    1. Remove the EFI-MAIN relay from the No. 1 engine room relay 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
    OK
  8. CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - BODY GROUND)


    1. Remove the EFI-MAIN relay from the No. 1 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
    OK
  9. CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - ECM)


    1. Remove the EFI-MAIN relay from the No. 1 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) - A35-2 (+B) Always Below 1 Ω
      3 (EFI-MAIN relay) - A35-3 (+B2) Always Below 1 Ω
      1 (EFI-MAIN relay) - A35-46 (MREL) Always Below 1 Ω
      3 (EFI-MAIN relay) or A35-2 (+B) - Body ground Always 10 kΩ or higher
      3 (EFI-MAIN relay) or A35-3 (+B2) - Body ground Always 10 kΩ or higher
      1 (EFI-MAIN relay) or A35-46 (MREL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    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
      C48-16 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

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


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

    2. Remove the IG2-MAIN relay from the No. 1 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
      I51-3 (IG1D) - 1 (IG2-MAIN relay) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG