SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the engine switch's 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/IGCT2 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.

A001AFZE87

WIRING DIAGRAM

Refer to DTC P0617 Click here.

PROCEDURE


  1. CHECK OPERATION OF CRANKING


    1. When starting the engine, check whether the starter motor starts.

      Result
      Starter Condition Proceed to
      Not operating A
      Operating B

    B

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

    A

  2. CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (ENGINE DOES NOT START)


    1. Refer to Smart Access System With Push-button Start [Engine does not start] Click here.


    NG

    REPAIR SMART ACCESS SYSTEM WITH PUSH-BUTTON START

    OK

  3. READ VALUE USING INTELLIGENT TESTER (STARTER 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 / 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

    OK

    INSPECT STARTER RELAY (ST/IGCT) Click here

    NG

  4. INSPECT ECM (STAR AND STSW VOLTAGE)


    1. A001F3AE02
      *1 STAR

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A14-2 (STAR) - E3-1 (E1) Engine cranking 11 to 14 V
      A14-27 (STSW) - E3-1 (E1) Engine 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

    GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START Click here

    A

  5. INSPECT STARTER CUT RELAY (ST CUT/IGCT2)


    1. A001BUF

      Remove the ST CUT/IGCT2 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

    NG

    REPLACE STARTER CUT RELAY (ST CUT/IGCT2)

    OK

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A001BFXE04
      *1 Component without harness connected: (Park / Neutral Position Switch)

      Disconnect the park/neutral position (PNP) switch connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      4 - 5 Shift position P Below 1 Ω
      4 - 5 Shift position N Below 1 Ω

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY (ST CUT/IGCT2) - PARK/NEUTRAL POSITION SWITCH)


    1. A001954E02
      *1 Engine Room No. 2 Relay Block
      *2 Front view of wire harness connector: (to Park / Neutral Position Switch)

      Remove the ST CUT/IGCT2 relay from the engine room No. 2 relay block.

    2. Disconnect the E60 switch connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified condition
      ST CUT/IGCT2 (3) - E60-4 Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified condition
      ST CUT/IGCT2 (3) or E60-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY (ST CUT/IGCT2) - ECM)


    1. A001A1SE01
      *1 Engine Room No. 2 Relay Block
      *2 ECM Connector
      *3 STAR

      Remove the ST CUT/IGCT2 relay from the engine room No. 2 relay block.

    2. Disconnect the A14 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
      ST CUT/IGCT2 (5) - A14-2 (STAR) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified condition
      ST CUT/IGCT2 (5) or A14-2 (STAR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK ENGINE ROOM NO. 2 RELAY BLOCK (STARTER CUT RELAY (ST CUT/IGCT2) - IGNITION RELAY NO. 2 (IG2), BODY GROUND)


    1. A001BQIE02
      *1 Engine Room No. 2 Relay Block

      Remove the IG2 relay from the engine room No. 2 relay block.

    2. Remove the ST CUT/IGCT2 relay from the engine room No. 2 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
      ST CUT/IGCT2 (2) - IG2 (3) Always Below 1 Ω
      ST CUT/IGCT2 (1) - Body ground Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified condition
      ST CUT/IGCT2 (2) or IG2 (3) - Body ground Always 10 kΩ or higher

    OK

    REPLACE HARNESS OR CONNECTOR (IGNITION RELAY NO. 2 (IG2) - BATTERY)

    NG

    REPLACE ENGINE ROOM NO. 2 RELAY BLOCK, JUNCTION BLOCK

  10. INSPECT STARTER RELAY (ST/IGCT)


    1. A001BUF

      Remove the ST/IGCT 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

    NG

    REPLACE STARTER RELAY (ST/IGCT)

    OK

  11. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST/IGCT) - PARK/NEUTRAL POSITION SWITCH, BODY GROUND)


    1. A001CTJE02
      *1 Engine Room No. 2 Relay Block
      *2 Front view of wire harness connector: (Park / Neutral Position Switch)

      Remove the ST/IGCT relay from the engine room No. 2 relay block.

    2. Disconnect the E60 switch connector.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      ST/IGCT relay (1) - E60-5 Always Below 1 Ω
      ST/IGCT relay (2) - Body ground Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      ST/IGCT relay (1) or E60-5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPAIR OR REPLACE STARTER ASSEMBLY Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - STARTER RELAY (ST/IGCT), BATTERY)


    1. Remove the ST/IGCT relay from the engine room No. 2 relay block.

      A001EDFE02
      *1 Engine Room No. 2 Relay Block
      *2 Front view of wire harness connector: (to Starter)

    2. Disconnect the E25 and F1 starter connectors.

    3. Disconnect the cable from the positive battery terminal.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      ST/IGCT relay (3) - E25-1 Always Below 1 Ω
      F1-1 - Battery cable (+) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      ST/IGCT relay (3) or E25-1 - Body ground Always 10 kΩ or higher
      F1-1 or Battery cable (+) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR