SFI SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST2 of the ignition 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

Refer to DTC P0617 Click here.

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 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
      NG (w/ stop and start system) A
      NG (w/o stop and start system) B
      OK (w/ stop and start system) C
      OK (w/o stop and start system) D

    B

    INSPECT CLUTCH START SWITCH ASSEMBLY Click here

    C

    GO TO STOP AND START SYSTEM (STARTER SIGNAL CIRCUIT) Click here

    D

    INSPECT ST NO.1 RELAY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (ECM - ENGINE STOP AND START ECU - ST NO. 2 RELAY)


    1. Disconnect the ECM connector.

    2. Disconnect the engine stop and start ECM connector.

    3. Remove the ST NO. 2 relay from the No. 2 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
      A62-29 (STA) - A66-23 (STA2) Always Below 1 Ω
      A62-29 (STA), A66-23 (STA2) or 2 (ST NO. 2 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ECM - ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)


    1. Disconnect the ECM connector.

    2. Disconnect the engine stop and start ECM connector.

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

    4. Disconnect the certification ECU (smart key ECU assembly) connector (w/ Entry and Start System).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A62-23 (NSW) - A66-28 (CLL) Always Below 1 Ω
      A62-23 (NSW), A66-28 (CLL) or B36-4 (B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STOP AND START SYSTEM (STARTER SIGNAL CIRCUIT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly Click here.

      Result
      Result Proceed to
      OK (w/ Entry and Start System) A
      OK (w/o Entry and Start System) B
      NG C

    B

    INSPECT IGNITION SWITCH ASSEMBLY Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    A

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


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

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G82-5 (STAR) - A4-2 Always Below 1 Ω
      G82-5 (STAR) or A4-2 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G82-5 (STAR) - F2-2 Always Below 1 Ω
      G82-5 (STAR) or F2-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the clutch start switch assembly connector.

    2. Remove the ST NO.1 relay from the No. 2 engine room relay block and junction block assembly.

    3. Disconnect the ECM connector.

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

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A4-1 - A62-29 (STA) Always Below 1 Ω
      A4-1, 2 (ST NO.1 relay), A62-29 (STA) or G82-7 (STA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      F2-1 - A62-29 (STA) Always Below 1 Ω
      F2-1, 2 (ST NO.1 relay), A62-29 (STA) or G82-7 (STA) - 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

  8. INSPECT IGNITION SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly Click here.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IGNITION SWITCH ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY)


    1. Disconnect the ignition switch assembly connector.

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G4-2 (ST2) - A4-2 Always Below 1 Ω
      G4-2 (ST2) or A4-2 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G4-2 (ST2) - F2-2 Always Below 1 Ω
      G4-2 (ST2) or F2-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the clutch start switch assembly connector.

    2. Remove the ST NO.1 relay from the No. 2 engine room relay block and junction block assembly.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A4-1 - A62-29 (STA) Always Below 1 Ω
      A4-1, 2 (ST NO.1 relay) or A62-29 (STA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      F2-1 - A62-29 (STA) Always Below 1 Ω
      F2-1, 2 (ST NO.1 relay) or A62-29 (STA) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. 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

  12. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

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


    1. Remove the ST NO.1 relay from the No. 2 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) - B6-1 Always Below 1 Ω
      3 (ST NO.1 relay) or B6-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER ASSEMBLY)


    1. Disconnect the starter assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      C6-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01KBUQC02
      *1 No. 2 Engine Room Relay Block and Junction Block Assembly
      *2 ST NO.1 Relay

      Remove the ST NO.1 relay from the No. 2 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

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


    1. Remove the ST NO.1 relay from the No. 2 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

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


    1. Remove the ST NO.1 relay from the No. 2 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
      for LHD
      Tester Connection Condition Specified Condition
      2 (ST NO.1 relay) - A4-1 Always Below 1 Ω
      2 (ST NO.1 relay) or A4-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      2 (ST NO.1 relay) - F2-1 Always Below 1 Ω
      2 (ST NO.1 relay) or F2-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. 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/ Stop and Start system) B
      NG (w/o Stop and Start system) C

    A

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

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO.2 RELAY - ECM)

    C

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