SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the engine switch start signal (STSW). When the ECM judges that the engine has started, the system cuts current to the starter. When the ECM receives the STSW signal, the ACC (Accessory) relay is turned off to prevent flickering of the combination meter, clock and audio system. Also, the STAR output signal travels through the ST cut relay and the park/neutral position switch assembly to the ST relay, causing the starter to activate.

When the engine is cranking, the starter operation signal is received by the STA terminal of the ECM.

A01CG95E02

WIRING DIAGRAM

Refer to DTC P0617 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

    4. Read the value displayed on the tester when the engine switch is on (IG) and the engine is started.

      OK
      Condition Tester Display
      Engine switch on (IG)

      OFF*1

      Close*2
      Engine started

      ON*1

      Open*2

      • *1: for models w/ CVT (w/o Euro-OBD)

      • *2: for other models


    NG

    INSPECT RELAY (ST CUT RELAY) Click here

    OK

  2. INSPECT RELAY (ST RELAY)


    1. A01CC90E03

      Remove the ST relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 No battery voltage applied across terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied across terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST relay.


    NG

    REPLACE RELAY (ST RELAY)

    OK

  3. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY)


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

    2. Remove the ST relay from the engine room relay block.

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

      Standard Resistance (Check for Open)
      for RHD
      Tester Connection Condition Specified Condition
      D3-9 - 1 (ST relay terminal) Always Below 1 Ω
      for LHD
      Tester Connection Condition Specified Condition
      D3-5 - 1 (ST relay terminal) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for RHD
      Tester Connection Condition Specified Condition
      D3-9 or 1 (ST relay terminal) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      D3-5 or 1 (ST relay terminal) - Body ground Always Below 1 Ω

    4. Reconnect the park/neutral position switch assembly connector.

    5. Reinstall the ST relay.


    NG

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

    OK

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


    1. Remove the ST relay from the engine room 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
      2 (ST relay terminal) - Body ground Always Below 1 Ω

    3. Reinstall the ST relay.


    NG

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

    OK

  5. CHECK HARNESS AND CONNECTOR (ST RELAY VOLTAGE)


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

    3. Reinstall the ST relay.


    NG

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

    OK

  6. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here for 1.6 kW type, Click here for 1.7 kW type).

      Result
      Result Proceed to
      OK A
      NG (for 1.6 kW Type) B
      NG (for 1.7 kW Type) C

    B

    REPLACE STARTER ASSEMBLY Click here

    C

    REPLACE STARTER ASSEMBLY Click here

    A

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


    1. Remove the ST relay from the engine room relay block.

    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 terminal) - D5-1 Always Below 1 Ω

    4. Reinstall the ST relay.

    5. Reconnect the starter assembly connector.


    NG

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

    OK

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

  8. INSPECT RELAY (ST CUT RELAY)


    1. A01CC90E03

      Remove the ST CUT relay from the fusible link block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 No battery voltage applied across terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied across terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST CUT relay.


    NG

    REPLACE RELAY (ST CUT RELAY)

    OK

  9. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly for A/T models Click here or CVT models Click here.

      Result
      Result Proceed to
      OK A
      NG (for A/T models) B
      NG (for CVT models) C

    B

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    C

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    A

  10. CHECK HARNESS AND CONNECTOR (STSW VOLTAGE)


    1. Disconnect the ECM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A8-14 (STSW) - Body ground Cranking 9 to 13 V

    NG

    CHECK SMART ENTRY AND START SYSTEM Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


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

    2. Disconnect the ECM connector.

    3. Remove the ST CUT relay from the fusible link block assembly.

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

      Standard Resistance (Check for Open)
      for RHD
      Tester Connection Condition Specified Condition
      D3-9 - A8-48 (STA) Always Below 1 Ω
      for LHD
      Tester Connection Condition Specified Condition
      D3-5 - A8-48 (STA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for RHD
      Tester Connection Condition Specified Condition
      D3-9 or A8-48 (STA) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      D3-5 or A8-48 (STA) - Body ground Always 10 kΩ or higher

    5. Reinstall the ST CUT relay.

    6. Reconnect the ECM connector.

    7. Reconnect the park/neutral position switch assembly connector.


    NG

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

    OK

  12. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ST CUT RELAY)


    1. Remove the ST CUT relay from the fusible link block assembly.

    2. Disconnect the main body ECU connector.

    3. Disconnect the park/neutral position switch assembly.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      G48-8 (STR) - 5 (ST CUT relay terminal) Always Below 1 Ω
      G51-6 (STR2) - 3 (ST CUT relay terminal) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G48-8 (STR) or 5 (ST CUT relay terminal) - Body ground Always 10 kΩ or higher
      G51-6 (STR2) or 3 (ST CUT relay terminal) - Body ground Always 10 kΩ or higher

    5. Reconnect the park/neutral position switch assembly.

    6. Reconnect the main body ECU connector.

    7. Reinstall the ST CUT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - ST CUT RELAY)

    OK

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


    1. Remove the ST CUT relay from the fusible link block assembly.

    2. Disconnect the park/neutral position 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
      D3-4 - 5 (ST CUT relay terminal) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D3-4 or 5 (ST CUT relay terminal) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch assembly connector.

    5. Reinstall the ST CUT relay.


    NG

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

    OK

  14. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - ECM)


    1. Remove the ST CUT relay from the fusible link block assembly.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      3 (ST CUT relay terminal) - D41-52 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3 (ST CUT relay terminal) or D41-52 (STAR) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the ST CUT relay.


    NG

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

    OK

  15. CHECK HARNESS AND CONNECTOR (ST CUT RELAY POWER SOURCE)


    1. Remove the ST CUT relay from the fusible link block assembly.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2 (ST CUT relay terminal) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reinstall the ST CUT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - IG2 RELAY)

    OK

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


    1. Remove the ST CUT relay from the fusible link block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (ST CUT relay terminal) - Body ground Always Below 1 Ω

    3. Reinstall the ST CUT relay.


    NG

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

    OK

    REPLACE ECM Click here