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 clutch start switch assembly and to terminal STA of the ECM (STA signal).


WIRING DIAGRAM

Refer to DTC P0617.

Click here

CAUTION / NOTICE / HINT

Note


  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Starter Signal

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

      OK
      Switch Position Starter Signal
      ON OFF
      START ON
      Result
      Result Proceed to
      OK A
      NG (w/ entry and start system) B
      NG (w/o entry and start system) C

    B

    INSPECT CLUTCH START SWITCH ASSEMBLY Click here

    C

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLY Click here

    A

  3. INSPECT ST NO. 1 RELAY


    1. Inspect the ST NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST NO. 1 RELAY

    OK

  4. 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 - B15-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST NO. 1 RELAY)


    1. A012KUTC06
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 ST NO. 1 Relay

      Remove the ST NO. 1 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 (ST NO. 1 relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST NO. 1 RELAY)

    OK

  6. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - CLUTCH START SWITCH ASSEMBLY)


    1. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ST NO. 1 relay) - A5-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND)


    1. Remove the ST NO. 1 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
      1 (ST NO. 1 relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY)


    1. Remove the ST NO. 1 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
      3 (ST NO. 1 relay) - B8-1 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

  9. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly.

      Click here

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

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY - ECM) Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    A

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU)


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

    2. Disconnect the clutch start switch assembly connector.

    3. Disconnect the ECM connector.

    4. Disconnect the engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E33-5 (STAR) - B31-63 (NSW) Always Below 1 Ω
      E33-5 (STAR) - A5-2 Always Below 1 Ω
      E33-5 (STAR) - A9-28 (CLL) Always Below 1 Ω
      E33-5 (STAR) or A5-2 or B31-63 (NSW) or A9-28 (CLL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU - ST NO. 1 RELAY)


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

    2. Disconnect the clutch start switch assembly connector.

    3. Disconnect the ECM connector.

    4. Disconnect the engine stop and start ECU connector.

    5. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-1 - A50-22 (STA) Always Below 1 Ω
      E33-7 (STA) or A5-1 or A50-22 (STA) or A9-21 (STA) or 2 (ST NO. 1 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


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

    2. Disconnect the clutch start 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
      E33-5 (STAR) - B31-63 (NSW) Always Below 1 Ω
      E33-5 (STAR) - A5-2 Always Below 1 Ω
      E33-5 (STAR) or A5-2 or B31-63 (NSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY - ECM - ST NO. 1 RELAY)


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

    2. Disconnect the clutch start switch assembly connector.

    3. Disconnect the ECM connector.

    4. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-1 - A50-22 (STA) Always Below 1 Ω
      E33-7 (STA) or A5-1 or A50-22 (STA) or 2 (ST NO. 1 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Inspect the ignition or starter switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY Click here

    OK

  15. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly.

      Click here

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

    B

    CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY - ECM) Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    A

  16. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU)


    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the clutch start switch assembly connector.

    3. Disconnect the ECM connector.

    4. Disconnect the engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-2 (ST2) - B31-63 (NSW) Always Below 1 Ω
      E4-2 (ST2) - A5-2 Always Below 1 Ω
      E4-2 (ST2) - A9-28 (CLL) Always Below 1 Ω
      E4-2 (ST2) or A5-2 or B31-63 (NSW) or A9-28 (CLL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM - ENGINE STOP AND START ECU - ST NO. 1 RELAY)


    1. Disconnect the clutch start switch assembly connector.

    2. Disconnect the ECM connector.

    3. Disconnect the engine stop and start ECU connector.

    4. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-1 - A50-22 (STA) Always Below 1 Ω
      A5-1 or A50-22 (STA) or A9-21 (STA) or 2 (ST NO. 1 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY - ECM)


    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the clutch start 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
      E4-2 (ST2) - B31-63 (NSW) Always Below 1 Ω
      E4-2 (ST2) - A5-2 Always Below 1 Ω
      E4-2 (ST2) or A5-2 or B31-63 (NSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM - ST NO. 1 RELAY)


    1. Disconnect the clutch start switch assembly connector.

    2. Disconnect the ECM connector.

    3. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-1 - A50-22 (STA) Always Below 1 Ω
      A5-1 or A50-22 (STA) or 2 (ST NO. 1 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the 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.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Starter Signal

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

      OK
      Switch Position Starter Signal
      ON OFF
      START ON
      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 (ST NO. 1 RELAY - ECM)