SFI SYSTEM Starter Signal Circuit

DESCRIPTION

When the engine switch is pushed (when engine start is permitted), the certification ECU (smart key ECU assembly) outputs voltage from terminal STAR (starter pinion operation signal) to the ST relay, via the park/neutral position switch assembly, to operate the starter pinion gear.

Then the starter delay circuit built into the engine stop and start ECU outputs voltage from terminal STA2 (starter motor operation signal) to the ST NO. 2 relay to operate the starter motor.

When the voltage output from terminal STA2 (starter motor operation signal) of the engine stop and start ECU is input to terminal STA of the ECM, the ECM determines that the engine is cranking, and begins engine control for engine start.

WIRING DIAGRAM

Refer to DTC P061512 Click here.

CAUTION / NOTICE / HINT

Note


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

  • After turning engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • When the starter assembly is replaced, the number of starter operations stored in the engine stop and start ECU must be reset.

  • When the starter assembly is replaced, "ST relay" and "ST NO. 2 relay" must be also replaced.

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 SW)


    1. Connect the GTS to DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Starter SW.

    5. Check the value displayed on the GTS when the engine switch is turned to on (IG) and on (Start) positions.

      OK
      Engine Switch Position Starter SW
      On (IG) OFF
      On (Start) ON

    NG

    CHECK STOP AND START SYSTEM Click here

    OK

  3. INSPECT RELAY (ST NO. 2 RELAY)


    1. Inspect the ST NO. 2 relay Click here.


    NG

    REPLACE RELAY (ST NO. 2 RELAY)

    OK

  4. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - STARTER ASSEMBLY)


    1. Remove the ST NO. 2 relay from the 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. 2 relay) - D83-1 (SL2) Always Below 1 Ω
      3 (ST NO. 2 relay) or D83-1 (SL2) - Body ground and other terminals Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - ECM)


    1. Disconnect the starter assembly connector.

    2. Disconnect the ECM connector.

    3. Disconnect the engine stop and start ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ST NO. 2 relay) - A75-29 (STA) Always Below 1 Ω
      2 (ST NO. 2 relay) or A75-29 (STA) - Body ground and other terminals Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - BODY GROUND)


    1. Remove the ST NO. 2 relay from the 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. 2 relay) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (BATTERY - ST NO. 2 RELAY)


    1. Remove the ST NO. 2 relay from the 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. 2 relay) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT RELAY (ST RELAY)


    1. Inspect the ST Relay Click here.


    NG

    REPLACE RELAY (ST RELAY)

    OK

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


    1. Remove the ST Relay from the 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 relay) - D83-2 (SL1) Always Below 1 Ω
      3 (ST relay) or D83-2 (SL1) - Body ground and other terminals Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the ST Relay from the 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 Relay) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the ST relay from the 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 relay) - Body ground Always 11 to 14 V

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. READ VALUE USING GTS (STARTER SW)


    1. Connect the GTS to DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Starter SW.

    5. Check the value displayed on the GTS when the engine switch is turned to on (IG) and on (Start) positions.

      OK
      Engine Switch Position Starter SW
      On (IG) OFF
      On (Start) ON

    OK

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

    NG

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

  14. CHECK STOP AND START SYSTEM


    1. Check the stop and start system Click here.


    OK

    CHECK SMART ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE STOP AND START SYSTEM Click here