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) to the park/neutral position switch assembly and to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

A011U7VE05

INSPECTION PROCEDURE

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 TECHSTREAM (STARTER SIGNAL) Click here

    A

  2. READ VALUE USING TECHSTREAM (STARTER SIGNAL)

    1. Connect the Techstream to DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

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

    5. Check the value displayed on the Techstream when the engine switch is turned to the on (IG) and the engine is started.

      OK
      Switch Condition Tester Display (Starter Signal)
      Engine switch on (IG) OFF
      Engine started ON
    NG

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  3. INSPECT RELAY (ST RELAY)

    1. Inspect the ST relay Click here.

    NG

    REPLACE RELAY (ST 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 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) - E9-1 Always Below 1 Ω
      3 (ST relay) or E9-1 - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BATTERY - STARTER ASSEMBLY)

    1. Disconnect the starter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F2-1 - Body ground Always 11 to 14 V
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. 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

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

    1. Remove the ST relay from the engine room relay block and junction block assembly.

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

    3. Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-9 (L) - 2 (ST relay) Always Below 1 Ω
      A43-7 (STA) - 2 (ST relay) Always Below 1 Ω
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO SMART KEY SYSTEM Click here

  10. READ VALUE USING TECHSTREAM (STARTER SIGNAL)

    1. Connect the Techstream to DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the Techstream on.

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

    5. Check the value displayed on the Techstream when the engine switch is turned to the on (IG) and the engine is started.

      OK
      Switch Condition Tester Display (Starter Signal)
      Engine switch on (IG) OFF
      Engine started ON
    NG

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

    OK

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

  11. 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

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

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

    2. Disconnect the certification ECU (smart key ECU assembly) connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-5 (STAR) - E4-4 (B) Always Below 1 Ω
      A43-5 (STAR) - E26-65 (NSW) Always Below 1 Ω
      A43-5 (STAR) or E4-4 (B) or E26-65 (NSW) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

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

    2. Disconnect the ECM connector.

    3. Remove the ST relay from the engine room relay block and junction block assembly.

    4. Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-9 (L) - A25-9 (STA) Always Below 1 Ω
      E4-9 (L) or A25-9 (STA) or 2 (ST relay) or A43-7 (STA) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO SMART KEY SYSTEM Click here