SFI SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST2 of the ignition or starter switch assembly*1 or terminal STAR of the certification ECU (smart key ECU assembly)*2 to the park/neutral position switch assembly and to terminal STA of the ECM (STA signal).


WIRING DIAGRAM

A005IGGE04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK WHETHER ENGINE CAN BE CRANKED


    1. Check if the engine can be cranked.

      Result
      Result Proceed to
      Engine cannot be cranked A
      Engine can be cranked B

    B

    READ VALUE USING GTS (STARTER SIGNAL) Click here

    A

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

    5. Read the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK
      Switch Position Starter Signal
      ON Close (OFF)
      START Open (ON)

    NG

    INSPECT PARK / NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  3. INSPECT RELAY (ST RELAY)


    1. Inspect the ST relay Click here.


    NG

    REPLACE RELAY (ST RELAY)

    OK

  4. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)


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

    2. Disconnect the starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 3 - B1-1 Always Below 1 Ω
      ST relay terminal 3 or B1-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BATTERY - STARTER ASSEMBLY)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the cable from the positive (+) battery terminal.

    3. Disconnect the starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Positive (+) battery terminal - B53-1 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


    1. Remove the ST 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
      ST relay terminal 1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ST RELAY - PARK / NEUTRAL POSITION SWITCH ASSEMBLY)


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

    2. Disconnect the park / neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - B69-9 (L) Always Below 1 Ω
      ST relay terminal 2 or B69-9 (L) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

    5. Read the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK
      Switch Position Starter Signal
      ON Close (OFF)
      START Open (ON)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)

  10. INSPECT PARK / NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park / neutral position switch assembly Click here.

      Result
      Result Proceed to
      OK (w/o smart entry and start system) A
      OK (w/ smart entry and start system) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ECM) Click here

    C

    REPLACE PARK / NEUTRAL POSITION SWITCH ASSEMBLY Click here

    A

  11. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Inspect the ignition or starter switch assembly Click here.


    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the park / neutral position switch assembly connector.

    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
      F13-7 (ST2) - B69-4 (B) Always Below 1 Ω
      F13-7 (ST2) - E23-63 (NSW) Always Below 1 Ω
      F13-7 (ST2) or B69-4 (B) or E23-63 (NSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY - ECM)


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

    2. Disconnect the park / neutral position switch assembly connector.

    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
      B69-9 (L) - ST relay terminal 2 Always Below 1 Ω
      B69-9 (L) or ST relay terminal 2 or A58-22 (STA) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


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

    2. Disconnect the park / neutral position switch assembly connector.

    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
      F65-5 (STAR) - B69-4 (B) Always Below 1 Ω
      F65-5 (STAR) - B23-63 (NSW) Always Below 1 Ω
      F65-5 (STAR) or B69-4 (B) or B23-63 (NSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY - ECM - CERTIFICATION ECU)


    1. Disconnect the park / neutral position switch assembly connector.

    2. Disconnect the ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - B69-9 (L) Always Below 1 Ω
      ST relay terminal 2 or B69-9 (L) or A58-22 (STA) or F65-7 (STA) - Body ground Always 10 kΩ or higher

    OK

    GO TO SMART ENTRY AND START SYSTEM (for Start Function)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR