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 an ECM receives the STSW signal, it turns off the ACC relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the STAR terminal of the ECM. Then the STAR output signal travels through the Park/Neutral Position (PNP) switch to the ST relay, causing the starter to activate.

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

A0155K5E40

WIRING DIAGRAM

Refer to DTC P0617 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CRANKING


    1. Check the cranking of the engine.

      Result
      Test Result Proceed to
      Cranking possible and holding control operates A
      Does not crank B
      Cranking possible but holding control does not operate (for automatic transmission) C
      Cranking possible but holding control does not operate (for manual transmission) D

    B

    READ VALUE USING GTS (STARTER SIGNAL) Click here

    C

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) Click here

    D

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) Click here

    A

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read values.

    6. Check the result when the ignition switch is turned to ON and when the engine is started.

      OK
      Condition Display (Starter Signal)
      Ignition switch ON OFF
      Engine is started ON
      Result
      Result Proceed to
      OK A
      NG (for automatic transmission) B
      NG (for manual transmission) C

    B

    INSPECT STARTER CUT RELAY (ST CUT) Click here

    C

    INSPECT STARTER CUT RELAY (ST CUT) Click here

    A

  3. INSPECT STARTER RELAY (ST)


    1. Inspect the starter relay (ST) Click here.


    NG

    REPLACE STARTER RELAY (ST)

    OK

  4. CHECK HARNESS AND CONNECTOR (ST RELAY - PNP SWITCH, CLUTCH START SWITCH)

    A0156YPE01

    1. Disconnect the Park/Neutral Position (PNP) switch (for automatic transmission).

    2. Disconnect the clutch start switch (for manual transmission).

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

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

      Standard Resistance
      for automatic transmission
      Tester Connection Condition Specified Condition
      ST relay (2) - C24-5 Always Below 1 Ω
      ST relay (2) or C24-5 - Body ground Always 10 kΩ or higher
      ST relay (1)* - C24-5 Always Below 1 Ω
      ST relay (1)* or C24-5 - Body ground Always 10 kΩ or higher
      for manual transmission
      Tester Connection Condition Specified Condition
      ST relay (2) - A49-2 Always Below 1 Ω
      ST relay (2) or A49-2 - Body ground Always 10 kΩ or higher

      *: GRJ200L-GNANKC


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A015BWZE01

    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
      ST relay (1) - ST relay (5) Always 11 to 14 V
      ST relay (2)* - ST relay (5) Always 11 to 14 V

      *: GRJ200L-GNANKC


    NG

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

    OK

  6. INSPECT STARTER


    1. Inspect the starter Click here.


    NG

    REPLACE STARTER Click here

    OK

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

  7. INSPECT STARTER CUT RELAY (ST CUT)


    1. Inspect the starter cut relay (ST CUT) Click here.


    NG

    REPLACE STARTER CUT RELAY (ST CUT)

    OK

  8. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)

    A015CZ9E11

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the PNP switch 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
      ST CUT relay (5) - C45-16 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 Always Below 1 Ω
      ST CUT relay (5) or C45-16 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT PARK/NEUTRAL POSITION SWITCH


    1. A0158Z9E06

      Inspect the Park/Neutral Position (PNP) switch.


      1. Disconnect the PNP switch connector.

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

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

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM)

    A015CRWE13

    1. Disconnect the PNP switch connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C24-5 - A38-46 (STA) Always Below 1 Ω
      C24-5 or A38-46 (STA) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE ECM Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

    A0156PKE09

    1. Disconnect the main body ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-4 (STSW) - A38-14 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A38-14 (STSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)

    A015CZ9E11

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the PNP switch 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
      ST CUT relay (5) - C45-16 (STAR) Always Below 1 Ω
      ST CUT relay (3) - C24-4 Always Below 1 Ω
      ST CUT relay (5) or C45-16 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or C24-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  13. INSPECT STARTER CUT RELAY (ST CUT)


    1. Inspect the starter cut relay (ST CUT) Click here.


    NG

    REPLACE STARTER CUT RELAY (ST CUT)

    OK

  14. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - CLUTCH START SWITCH, ECM)

    A0158LEE03

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the clutch start switch 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
      ST CUT relay (5) - C45-16 (STAR) Always Below 1 Ω
      ST CUT relay (3) - A49-1 Always Below 1 Ω
      ST CUT relay (5) or C45-16 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or A49-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch (for LHD) Click here.

    2. Inspect the clutch start switch (for RHD) Click here.

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    A

  16. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM)

    A015A9ZE03

    1. Disconnect the clutch start switch connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-2 - A38-46 (STA) Always Below 1 Ω
      A49-2 or A38-46 (STA) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE ECM Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

    A0156PKE09

    1. Disconnect the main body ECU connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E4-4 (STSW) - A38-14 (STSW) Always Below 1 Ω
      E4-4 (STSW) or A38-14 (STSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - CLUTCH START SWITCH SWITCH, ECM)

    A0158LEE03

    1. Remove the starter cut relay (ST CUT) from the engine room relay block.

    2. Disconnect the clutch start switch 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
      ST CUT relay (5) - C45-16 (STAR) Always Below 1 Ω
      ST CUT relay (3) - A49-1 Always Below 1 Ω
      ST CUT relay (5) or C45-16 (STAR) - Body ground Always 10 kΩ or higher
      ST CUT relay (3) or A49-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  19. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  20. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Check the starter operation.

      OK
      Malfunction has been repaired successfully.

    NG

    GO TO ENTRY AND START SYSTEM (ENGINE DOES NOT START) Click here

    OK

    END