SFI SYSTEM Starter Signal Circuit

DTC Code DTC Name
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).

  • *1: w/o entry and start system.

  • *2: w/ entry and start system.

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 hereClick 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 ASSEMBLYClick here

    C

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLYClick 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. A290378C06

      *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 hereClick 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 hereClick 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 hereClick 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 hereClick here

    NG

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