SFI SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly)*1 or terminal ST2 of the ignition or starter switch assembly*2 to the park/neutral position switch 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 SW) Click here

    A

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to 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 ON and the engine is started.

      OK
      Condition GTS Display (Starter Signal)
      Ignition switch ON OFF
      Cranking position ON
      Result
      Result Proceed to
      OK A
      NG B

    B

    INSPECT PARK/NEUTRAL POSITION SWITCH Click here

    A

  3. INSPECT ST RELAY


    1. Inspect the ST relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST RELAY

    OK

  4. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - ECM)


    1. Remove the ST relay from the No. 1 engine room relay block.

    2. Disconnect the A38 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ST relay holder) - A38-29 (STA) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)

    OK

  6. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)


    1. Remove the ST relay from the No. 1 engine room relay block.

    2. Disconnect the C35 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 relay holder) - C35-1 Always Below 1 Ω
      3 (ST relay holder) or C35-1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - STARTER ASSEMBLY)

    OK

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


    1. B008KY2C01
      *1 No.1 Engine Room Relay Block
      *2 ST Relay Holder

      Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (ST relay holder) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  8. CHECK HARNESS AND CONNECTOR (BATTERY - ST RELAY)


    1. B008KY2C01
      *1 No.1 Engine Room Relay Block
      *2 ST Relay Holder

      Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (ST relay holder) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY)

  9. INSPECT PARK/NEUTRAL POSITION SWITCH


    1. Inspect the park/neutral position switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH VOLTAGE)


    1. B008K50C30
      *a

      Front view of wire harness connector

      (to Park/Neutral Position Switch)

      Disconnect the C36 park/neutral position switch connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C36-4 (B) - Body ground Engine cranking position 11 to 14 V
      Result
      Result Proceed to
      OK (w/ Entry and Start System) A
      OK (w/o Entry and Start System) B
      NG (w/ Entry and Start System) C
      NG (w/o Entry and Start System) D

    B

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

    C

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM - PARK/NEUTRAL POSITION SWITCH) Click here

    D

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLY Click here

    A

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


    1. Disconnect the M66 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the C36 park/neutral position switch connector.

    3. Remove the ST relay from the No. 1 engine room relay block.

    4. Disconnect the A38 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M66-20 (STA) - C36-9 (L) Always Below 1 Ω
      2 (ST relay holder) - A38-29 (STA) Always Below 1 Ω
      A38-29 (STA), M66-20 (STA), 2 (ST relay holder) or C36-9 (L) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK ENTRY AND START SYSTEM (FOR START FUNCTION) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)

  12. CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH - ECM)


    1. Disconnect the C36 park/neutral position switch connector.

    2. Remove the ST relay from the No. 1 engine room relay block.

    3. Disconnect the A38 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ST relay holder) - C36-9 (L) Always Below 1 Ω
      2 (ST relay holder) - A38-29 (STA) Always Below 1 Ω
      A38-29 (STA), 2 (ST relay holder) or C36-9 (L) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 14 Click here

    NG

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

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM - PARK/NEUTRAL POSITION SWITCH)


    1. Disconnect the M66 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the C36 park/neutral position switch connector.

    3. Disconnect the A38 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M66-9 (STAR) - C36-4 (B) Always Below 1 Ω
      A38-57 (NSW), M66-9 (STAR) or C36-4 (B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK ENTRY AND START SYSTEM (FOR START FUNCTION) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM - PARK/NEUTRAL POSITION SWITCH)

  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. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY VOLTAGE)


    1. Disconnect the F12 ignition or starter switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F12-6 (ST1) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

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

  16. READ VALUE USING GTS (STARTER SW)


    1. Connect the GTS to 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 SW.


      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 ON and the engine is started.

      OK
      Condition GTS Display (Starter Signal)
      Ignition switch ON OFF
      Cranking position ON
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)