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, prevents 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

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 / 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
      Engine started ON

    NG

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  2. INSPECT RELAY (ST RELAY)


    1. A01CC90E02

      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 to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to 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.

      A01CBR0E01

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

    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. A01CC0PE01

      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
      2 (ST relay) - 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. A01CC0PE01

      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) - 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.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

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


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

      A01CDMME01

    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) - 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. A01CDPLE01

      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 to terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied to 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 Click here.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (STSW VOLTAGE)


    1. A01CBGLE05

      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.

      A01CBBEE01

    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
      D3-9 (Park/neutral position switch assembly) - A8-48 (STA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D3-9 (Park/neutral position switch assembly) or A8-48 (STA) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. 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.

      A01CBVFE03

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

    4. Reconnect the main body ECU connector.

    5. 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.

      A01CFHSE01

    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 (Park/neutral position switch assembly) - 5 (ST CUT relay) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D3-4 (Park/neutral position switch assembly) or 5 (ST CUT relay) - 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.

      A01CBMXE01

    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) - D1-63 (STAR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      3 (ST CUT relay) or D1-63 (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. A01CDPLE01

      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) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reinstall the ST CUT relay.


    NG

    CHECK ECM POWER SOURCE CIRCUIT Click here

    OK

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


    1. A01CDPLE01

      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) - 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