SFI SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch (w/o entry and start system) or terminal STAR of the power management control ECU (w/ entry and start system) 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.

INSPECTION PROCEDURE

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 INTELLIGENT TESTER (STARTER SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Read the value.

      OK
      Ignition Switch Position Starter Signal
      ON OFF
      START ON

    NG

    CHECK STARTER RELAY (ST) (POWER SOURCE) Click here

    OK

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

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


    1. A00O4ENE01
      Text in Illustration
      *1 Engine Room Relay Block
      *2 Starter relay (ST)

      Remove the starter relay (ST) from the engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Starter relay (ST) 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 (w/ Entry and start system) for Manual transmission B
      for Automatic transmission C
      NG (w/o Entry and start system) for Manual transmission D
      for Automatic transmission E

    3. Reinstall the starter relay (ST).


    B

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

    C

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

    D

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

    E

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

    A

  3. INSPECT STARTER RELAY (ST)


    1. Inspect the starter relay (ST) Click here.


    NG

    REPLACE STARTER RELAY (ST)

    OK

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


    1. Remove the ST relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 2 - Body ground Always Below 1 Ω

    3. Reinstall the starter relay (ST).


    NG

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

    OK

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

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


    1. Remove the starter relay (ST) from the engine room relay block.

    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)
      for LHD
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - A40-1 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - r1-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or A40-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or r1-1 - Body ground Always 10 kΩ or higher

    4. Reinstall the starter relay (ST).

    5. Reconnect the clutch start switch connector.


    NG

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

    OK

  6. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the clutch start switch connector.

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Condition Specified Condition
      A40-2 - G50-3 (STAR) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      r1-2 - G50-3 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      A40-2 or G50-3 (STAR) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      r1-2 or G50-3 (STAR) - Body ground Always 10 kΩ or higher

    4. Reconnect the clutch start switch connector.

    5. Reconnect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CLUTCH START SWITCH - POWER MANAGEMENT CONTROL ECU)

    OK

  7. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly Click here.


    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    OK

    GO TO ENTRY AND START SYSTEM Click here

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


    1. Remove the starter relay (ST) from the engine room relay block.

    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
      Starter relay (ST) terminal 1 - C40-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or C40-5 - Body ground Always 10 kΩ or higher

    4. Reinstall the starter relay (ST).

    5. Reconnect the park/neutral position switch connector.


    NG

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

    OK

  9. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the park/neutral position switch connector.

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C40-4 - G50-3 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C40-4 or G50-3 (STAR) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch connector.

    5. Reconnect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - POWER MANAGEMENT CONTROL ECU)

    OK

  10. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


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


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

    GO TO ENTRY AND START SYSTEM Click here

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


    1. Remove the starter relay (ST) from the engine room relay block.

    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)
      for LHD
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - A40-1 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - r1-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or A40-1 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or r1-1 - Body ground Always 10 kΩ or higher

    4. Reinstall the starter relay (ST).

    5. Reconnect the clutch start switch connector.


    NG

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

    OK

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


    1. Disconnect the clutch start switch connector.

    2. Disconnect the ignition switch connector.

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

      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Condition Specified Condition
      A40-2 - G2-1 (ST1) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      r1-2 - G2-1 (ST1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      A40-2 or G2-1 (ST1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      r1-2 or G2-1 (ST1) - Body ground Always 10 kΩ or higher

    4. Reconnect the clutch start switch connector.

    5. Reconnect the ignition switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CLUTCH START SWITCH - IGNITION SWITCH)

    OK

  13. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly Click here.


    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    OK

    REPLACE IGNITION SWITCH ASSEMBLY Click here

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


    1. Remove the starter relay (ST) from the engine room relay block.

    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
      Starter relay (ST) terminal 1 - C40-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Starter relay (ST) terminal 1 or C40-5 - Body ground Always 10 kΩ or higher

    4. Reinstall the starter relay (ST).

    5. Reconnect the park/neutral position switch connector.


    NG

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

    OK

  15. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - IGNITION SWITCH)


    1. Disconnect the park/neutral position switch connector.

    2. Disconnect the ignition 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
      C40-4 - G2-1 (ST1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C40-4 or G2-1 (ST1) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch connector.

    5. Reconnect the ignition switch connector.


    NG

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

    OK

  16. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


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


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

    REPLACE IGNITION SWITCH ASSEMBLY Click here