SFI SYSTEM Starter Signal Circuit

DTC Code DTC Name
Starter Signal Circuit

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).

  • *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:

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).

PROCEDURE

  1. 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

    READ VALUE USING GTS (STARTER SIGNAL)Click here

  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 / Starter Signal.

    5. Read the value.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

  3. CHECK ST RELAY (POWER SOURCE)

    1. A202099E01

      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 2 - 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

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

  4. INSPECT ST RELAY

    1. Inspect the ST relay (Click here).

    REPLACE ST RELAY

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

    1. 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 (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 1 - Body ground

      Always

      Below 1 Ω

    3. Reinstall the ST relay.

      Table 4. Result

      Result

      Proceed to

      OK

      A

      NG

      B

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

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

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

    1. 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 2 - A4-1

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 or A4-1 - Body ground

      Always

      10 kΩ or higher

    4. Reinstall the ST relay.

    5. Reconnect the clutch start switch assembly connector.

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

  7. INSPECT CLUTCH START SWITCH ASSEMBLY

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

    REPLACE CLUTCH START SWITCH ASSEMBLY

    (Click here)

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

    1. 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

    4. Reconnect the clutch start switch assembly connector.

    5. Reconnect the ignition switch assembly connector.

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

  9. INSPECT IGNITION SWITCH ASSEMBLY

    1. B119736E33

      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 5. Text in Illustration

      *a

      Component without harness connected

      (Ignition Switch Assembly)

    3. Reconnect the ignition switch assembly connector.

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

    REPLACE IGNITION SWITCH ASSEMBLY

    (Click here)

  10. 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 / Starter Signal.

    5. Read the value.

      OK

      Ignition Switch Position

      Starter Signal

      ON

      OFF

      START

      ON

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

  11. CHECK ST RELAY (POWER SOURCE)

    1. A202099E01

      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 2 - Body ground

      Engine cranking

      11 to 14 V
      Tip:

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

      Table 6. Text in Illustration

      *1

      No. 3 Relay Block

      *2

      ST Relay

    3. Reinstall the ST relay.

      Table 7. Result

      Result

      Proceed to

      OK

      A

      NG

      B

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

  12. INSPECT ST RELAY

    1. Inspect the ST relay (Click here).

    REPLACE ST RELAY

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

    1. 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 1 - Body ground

      Always

      Below 1 Ω

    3. Reinstall the ST relay.

      Table 8. Result

      Result

      Proceed to

      OK

      A

      NG

      B

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

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

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

    1. 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 2 - A4-1

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      ST relay terminal 2 or A4-1 - Body ground

      Always

      10 kΩ or higher

    4. Reinstall the ST relay.

    5. Reconnect the clutch start switch assembly connector.

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

  15. INSPECT CLUTCH START SWITCH ASSEMBLY

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

    REPLACE CLUTCH START SWITCH ASSEMBLY

    (Click here)

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

    1. 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

    4. Reconnect the clutch start switch assembly connector.

    5. Reconnect the power management control ECU connector.

    GO TO ENTRY AND START SYSTEM

    (Click here)

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