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 performs a firing judgment, the system cuts current to the starter. When the ECM receives the STSW signal, it turns on the ST CUT relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR output signal travels through the park/neutral position (PNP) switch to the STARTER relay, causing the starter to activate.

When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

A015ZM0E48

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. Check the result when the engine switch is turned on (IG) and the engine is started.

      Standard
      Starter Signal Engine Switch Position
      OFF on (IG)
      ON ENGINE START

    NG

    INSPECT ECM (STAR AND STSW VOLTAGE) Click here

    OK

  2. INSPECT STARTER RELAY


    1. A0161LXE02

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the STARTER relay.


    NG

    REPLACE STARTER RELAY

    OK

  3. INSPECT FUSIBLE LINK BLOCK ASSEMBLY (STARTER FUSE)


    1. A015ZLLE02

      Remove the fusible link block assembly from the engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-1 - 1G-4 Always Below 1 Ω

    3. Reinstall the fusible link block assembly.


    NG

    REPLACE FUSIBLE LINK BLOCK ASSEMBLY (STARTER FUSE)

    OK

  4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY)


    1. A0163G5E05

      Disconnect the park/neutral position switch connector.

    2. Remove the STARTER relay from the engine room No. 1 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
      Park/Neutral position switch (E45-5) - Starter relay (1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Park/Neutral position switch (E45-5) or Starter relay (1) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch connector.

    5. Reinstall the STARTER relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (STARTER RELAY - BODY GROUND)


    1. A015ZOSE04

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Starter relay (2) - Body ground Always Below 1 Ω

    3. Reinstall the STARTER relay.


    NG

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

    OK

  6. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)


    1. A015ZOSE05

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Starter relay (5) - Body ground Always 11 to 14 V

    3. Reinstall the STARTER relay.


    NG

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

    OK

  7. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPAIR OR REPLACE STARTER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (STARTER RELAY - STARTER ASSEMBLY)


    1. A0162AHE02

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

    2. Disconnect the starter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      STARTER relay (3) - E10-1 Always Below 1 Ω

    4. Reinstall the STARTER relay.

    5. Reconnect the starter connector.


    NG

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

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - BATTERY)

  9. INSPECT ECM (STAR AND STSW VOLTAGE)


    1. A015Z7TE94

      Measure the voltage according to the value(s) in the table below while cranking the engine.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A5-2 (STAR) - E6-1 (E1) Cranking 11 to 14 V
      A5-27 (STSW) - E6-1 (E1) Cranking 11 to 14 V
      Result
      Terminal STAR Terminal STSW Proceed to
      11 to 14 V 11 to 14 V A
      0 V 11 to 14 V B
      0 V 0 V C

    B

    REPLACE ECM Click here

    C

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM) Click here

    A

  10. INSPECT ST CUT RELAY


    1. A0161LX

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    3. Reinstall the ST CUT relay.


    NG

    REPLACE ST CUT RELAY

    OK

  11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A015Z3JE40

      Disconnect the park/neutral position switch connector.

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

      Standard Resistance
      Tester Connection Shift Lever Specified Condition
      4 (B) - 5 (L) P Below 1 Ω
      4 (B) - 5 (L) N Below 1 Ω

    3. Reconnect the park/neutral position switch connector.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. A0160GYE02

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

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST CUT relay (1) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reinstall the ST CUT relay.


    NG

    CHECK HARNESS AND CONNECTOR (ST CUT RELAY - POWER SOURCE CONTROL ECU) Click here

    OK

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


    1. A0163K7E01

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST CUT relay (2) - Body ground Always Below 1 Ω

    3. Reinstall the ST CUT relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0161QGE01

      Disconnect the ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-2 (STAR) - ST CUT relay (3) Always Below 1 Ω

    4. Reinstall the ST CUT relay.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A015YQWE01

      Disconnect the park/neutral position switch connector.

    2. Remove the ST CUT relay from the engine room No. 1 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
      Park/Neutral position switch (E45-4) - ST CUT relay (5) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Park/Neutral position switch (E45-4) or ST CUT relay (5) - Body ground Always 10 kΩ or higher

    4. Reconnect the park/neutral position switch connector.

    5. Reinstall the ST CUT relay.


    NG

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

    OK

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

  16. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - POWER SOURCE CONTROL ECU)


    1. A015Z3GE01

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

    2. Disconnect the power source control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST CUT relay (2) - J55-35 (IG2D) Always Below 1 Ω

    4. Reinstall the ST CUT relay.

    5. Reconnect the power source control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO ENTRY AND START SYSTEM Click here

  17. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM)


    1. A0160JSE07

      Check the harness and the connectors between the power source control ECU and ECM.


      1. Disconnect the power source control ECU connector.

      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
        J55-39 (STSW) - A5-27 (STSW) Always Below 1 Ω
        Standard Resistance (Check for Short)
        Tester Connection Condition Specified Condition
        J55-39 (STSW) or A5-27 (STSW) - Body ground Always 10 kΩ or higher

      4. Reconnect the ECM connector and power source control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO ENTRY AND START SYSTEM Click here