SFI SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to the park/neutral position switch (for automatic transmission) or clutch start switch (for manual transmission) and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM

Refer to DTC P0617 Click here.

CAUTION / NOTICE / HINT

Note

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

Tech Tips

This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to the problem symptoms table Click here.

PROCEDURE


  1. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the value.

      OK
      Engine Switch Position Starter Signal
      ON OFF
      START ON

    OK

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

    NG

  2. CHECK STARTER RELAY (ST RELAY) (POWER SOURCE)


    1. B001I67E01
      Text in Illustration
      *1 Engine Room Relay Block and junction block assembly
      *2 ST relay

      Remove the ST 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
      ST relay terminal 5 - Body ground Engine cranking 11 to 14 V

      Tech Tips

      The engine does not crank because the relay is not installed.

      Result
      Result Proceed to
      OK A
      NG for Manual transmission B
      for Automatic transmission C

    3. Reinstall the ST relay.


    B

    CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH) Click here

    C

    CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH) Click here

    A

  3. INSPECT ST RELAY


    1. Inspect the ST relay Click here.


    NG

    REPLACE ST RELAY

    OK

  4. 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

    3. Reinstall the ST relay.


    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH PEDAL SWITCH OR PARK/NEUTRAL POSITION SWITCH)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND)

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH)


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

    2. Disconnect the clutch start switch connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - A40-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 or A40-1 - Body ground Always 10 kΩ or higher

    4. Reinstall the ST relay.

    5. Reconnect the clutch start switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - CLUTCH START SWITCH)

    OK

  6. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the clutch start switch connector.

    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 (Check for Open)
      Tester Connection Condition Specified Condition
      A40-2 - G213-10 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A40-2 or G213-10 (STAR) - Body ground Always 10 kΩ or higher

    4. Reconnect the clutch start switch connector.

    5. Reconnect the certification ECU (smart key ECU assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CLUTCH START SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

    OK

  7. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly Click here.


    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

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


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

    2. Disconnect the park/neutral position switch connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - C159-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 or C159-5 - Body ground Always 10 kΩ or higher

    4. Reinstall the ST relay.

    5. Reconnect the park/neutral position switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH)

    OK

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


    1. Disconnect the park/neutral position switch connector.

    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 (Check for Open)
      Tester Connection Condition Specified Condition
      C159-4 - G213-10 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C159-4 or G213-10 (STAR) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch connector.

    5. Reconnect the certification ECU (smart key ECU assembly) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

    OK

  10. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


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


    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here