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SFI SYSTEM Starter Signal Circuit

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DTC Code DTC Name
  Starter Signal Circuit
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DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch*1 or terminal STAR of the power management control ECU*2 to the clutch pedal switch and also flows to terminal STA of the ECM (STA Signal).


A01IQ94E05
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

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).

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PROCEDURE


  1. Click here

    CHECK IF VEHICLE IS EQUIPPED WITH ENTRY AND START SYSTEM


    1. Confirm the entry and start system.

      Table 1. Result
      Result Proceed to
      w/o Entry and Start System A
      w/ Entry and Start System B

  2. Click here

    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 Close (OFF)
      START Open (ON)

  3. Click here

    CHECK ST RELAY (POWER SOURCE)


    1. A01IN0NE01

      Remove the ST relay from the No. 3 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - Body ground Engine cranking 11 to 14 V
      Tip:

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

      Table 2. Text in Illustration
      *1 No. 3 Relay Block
      *2 ST Relay

    3. Reinstall the ST relay.

      Table 3. Result
      Result Proceed to
      OK A
      NG B

  4. Click here

    INSPECT ST RELAY


    1. A01IOTM

      Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST relay.


  5. Click here

    CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


    1. A01IN0NE01

      Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *1 No. 3 Relay Block
      *2 ST Relay

    3. Reinstall the ST relay.

      Table 5. Result
      Result Proceed to
      OK A
      NG B

  6. Click here

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


    1. A01IU01E02

      Remove the ST relay from the No. 3 relay block.

    2. Disconnect the clutch start switch 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
      ST relay terminal 1 - A4-1 Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      ST relay terminal 1 or A4-1 - Body ground Always 10 kΩ or higher
      Table 6. Text in Illustration
      *1

      Front view of wire harness connector

      (to Clutch Start Switch Assembly)
      *2 No. 3 Relay Block
      *3 ST Relay

    4. Reinstall the ST relay.

    5. Reconnect the clutch start switch assembly connector.


  7. Click here

    INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly (Click here).


  8. Click here

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


    1. A01IRE9E03

      Disconnect the clutch start switch assembly connector.

    2. Disconnect the ignition switch 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
      A4-2 - H6-1 (ST1) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      A4-2 or H6-1 (ST1) - Body ground Always 10 kΩ or higher
      Table 7. Text in Illustration
      *1

      Front view of wire harness connector

      (to Clutch Start Switch Assembly)
      *2

      Front view of wire harness connector

      (to Ignition Switch Assembly)

    4. Reconnect the clutch start switch assembly connector.

    5. Reconnect the ignition switch assembly connector.


  9. Click here

    INSPECT IGNITION SWITCH ASSEMBLY


    1. A01IT63E06

      Disconnect the ignition switch assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      All terminals Off 10 kΩ or higher
      2 (AM1) - 1 (ST1) START Below 1 Ω
      Table 8. Text in Illustration
      *1

      Component without harness connected

      (Ignition Switch Assembly)

    3. Reconnect the ignition switch assembly connector.


  10. Click here

    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 Close (OFF)
      START Open (ON)

  11. Click here

    CHECK ST RELAY (POWER SOURCE)


    1. A01IN0NE01

      Remove the ST relay from the No. 3 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST relay terminal 1 - Body ground Engine cranking 11 to 14 V
      Tip:

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

      Table 9. Text in Illustration
      *1 No. 3 Relay Block
      *2 ST Relay

    3. Reinstall the ST relay.

      Table 10. Result
      Result Proceed to
      OK A
      NG B

  12. Click here

    INSPECT ST RELAY


    1. A01IOTM

      Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST relay.


  13. Click here

    CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


    1. A01IN0NE01

      Remove the ST relay from the No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - Body ground Always Below 1 Ω
      Table 11. Text in Illustration
      *1 No. 3 Relay Block
      *2 ST Relay

    3. Reinstall the ST relay.

      Table 12. Result
      Result Proceed to
      OK A
      NG B

  14. Click here

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


    1. A01IU01E02

      Remove the ST relay from the No. 3 relay block.

    2. Disconnect the clutch start switch 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
      ST relay terminal 1 - A4-1 Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      ST relay terminal 1 or A4-1 - Body ground Always 10 kΩ or higher
      Table 13. Text in Illustration
      *1

      Front view of wire harness connector

      (to Clutch Start Switch Assembly)
      *2 No. 3 Relay Block
      *3 ST Relay

    4. Reinstall the ST relay.

    5. Reconnect the clutch start switch assembly connector.


  15. Click here

    INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspection the clutch start switch assembly (Click here).


  16. Click here

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


    1. A01IPBKE04

      Disconnect the clutch start switch assembly 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
      A4-2 - H70-3 (STAR) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      A4-2 or H70-3 (STAR) - Body ground Always 10 kΩ or higher
      Table 14. Text in Illustration
      *1

      Front view of wire harness connector

      (to Clutch Start Switch Assembly)
      *2

      Rear view of wire harness connector

      (to Power Management Control ECU)

    4. Reconnect the clutch start switch assembly connector.

    5. Reconnect the power management control ECU connector.


  17. Click here

    REPLACE ST RELAY

  18. Click here

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

  19. Click here

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

  20. Click here

    REPLACE CLUTCH START SWITCH ASSEMBLYClick here

  21. Click here

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

  22. Click here

    REPLACE IGNITION SWITCH ASSEMBLYClick here

  23. Click here

    REPLACE ST RELAY

  24. Click here

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

  25. Click here

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

  26. Click here

    REPLACE CLUTCH START SWITCH ASSEMBLYClick here

  27. Click here

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

  28. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  29. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY)

  30. Click here

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

  31. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  32. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY)

  33. Click here

    GO TO ENTRY AND START SYSTEMClick here