SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system keeps energizing the starter relay from when the power management control ECU detects the starter signal from the ignition switch until the power management control ECU performs a judgement of "Engine started".

When the power management control ECU detects the STSW signal, the power management control ECU outputs the starter relay drive signal (STAR signal) to the starter relay through the clutch start switch or park/neutral position switch, and then, the engine is cranked. When the power management control ECU receives a stable engine speed signal (NE signal), more specifically, when the NE signal reaches a predetermined value, the power management control ECU stops outputting the STAR signal.

Also, the power management control ECU monitors the starter relay operating conditions based on the STA terminal voltage status.

WIRING DIAGRAM

A011BD3E01

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Check the result when the ignition switch is turned ON and the engine starts.

      OK
      Condition Starter Signal
      Ignition switch ON OFF
      Engine start ON
      Result
      Result Proceed to

      Outside standard range

      (for Manual Transaxle)

      		 A

      Outside standard range

      (for CVT)

      		 B

      Within standard range

      (for Manual Transaxle)

      		 C

      Within standard range

      (for CVT)

      		 D

    B

    INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    C

    CHECK HARNESS OR CONNECTOR (CLUTCH START SWITCH - ECM - ST RELAY) Click here

    D

    CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM - ST RELAY) Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)


    1. Disconnect the engine stop and start ECU connector.

    2. Connect an intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

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

      OK
      Condition Starter Signal
      Ignition switch ON OFF
      Engine start ON
      Result
      Result Proceed to
      NG A
      OK B

    7. Reconnect the engine stop and start ECU connector.


    B

    REPLACE ENGINE STOP AND START ECU Click here

    A

  3. INSPECT CLUTCH START SWITCH ASSEMBLY

    A0118J0E14

    1. Remove the clutch start switch assembly.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 ON (pushed) Below 1 Ω
      1 - 2 OFF (free) 10 kΩ or higher

    3. Reinstall the clutch start switch assembly.


    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - CLUTCH START SWITCH)


    1. Disconnect the power management control ECU connector.

    2. Disconnect the clutch start 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
      D36-3 (STAR) - A29-2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D36-3 (STAR) or A29-2 - Body ground Always 10 kΩ or higher

    4. Reconnect the power management control ECU connector.

    5. Reconnect the clutch start switch assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM - ST RELAY)


    1. Remove the ST relay.

    2. Disconnect the ECM connector.

    3. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - A18-48 (STA) Always Below 1 Ω
      ST relay terminal 2 - A29-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-48 (STA) or A29-1 - Body ground Always 10 kΩ or higher

    5. Reconnect the clutch start switch assembly connector.

    6. Reconnect the ECM connector.

    7. Reinstall the ST relay connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ENTRY AND START SYSTEM Click here

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

    A011857E02
    Text in Illustration
    *1

    Component without harness connected

    (Park/Neutral Position Switch)

    1. Remove the park/neutral position switch assembly.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      4 - 5 Shift position P, N Below 1 Ω
      4 - 5 Shift position not P, N 10 kΩ or higher

    3. Reinstall the park/neutral position switch assembly.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH)


    1. Disconnect the power management control ECU connector.

    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
      D36-3 (STAR) - B13-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D36-3 (STAR) or B13-4 - Body ground Always 10 kΩ or higher

    4. Reconnect the power management control ECU connector.

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


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the ST relay.

    2. Disconnect the ECM connector.

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - A18-48 (STA) Always Below 1 Ω
      ST relay terminal 2 - B13-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-48 (STA) or B13-5 - Body ground Always 10 kΩ or higher

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

    6. Reconnect the ECM connector.

    7. Install the ST relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK ENTRY AND START SYSTEM Click here

  9. CHECK HARNESS OR CONNECTOR (CLUTCH START SWITCH - ECM - ST RELAY)


    1. Remove the ST relay.

    2. Disconnect the clutch start switch assembly connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - A18-48 (STA) Always Below 1 Ω
      ST relay terminal 2 - A29-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-48 (STA) or A29-1 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      Outside standard range A
      Within standard range B

    5. Reconnect the ECM connector.

    6. Reconnect the clutch start switch assembly connector.

    7. Reinstall the ST relay.


    B

    INSPECT BATTERY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM - ST RELAY)


    1. Remove the ST relay.

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

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      ST relay terminal 2 - A18-48 (STA) Always Below 1 Ω
      ST relay terminal 2 - B13-5 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A18-48 (STA) or B13-5 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      Outside standard range A
      Within standard range B

    5. Reconnect the ECM connector.

    6. Reconnect the park/neutral position connector.

    7. Install the ST relay.


    B

    INSPECT BATTERY Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. INSPECT BATTERY


    1. Check that the battery is not depleted.

      OK
      Battery is not depleted.

    NG

    REPLACE BATTERY

    OK

  12. CHECK BATTERY TERMINAL


    1. Check that the battery terminals are not loose or corroded.

      OK
      Battery terminals are not loose or corroded.

    NG

    REPAIR OR REPLACE BATTERY TERMINAL

    OK

    REPAIR OR REPLACE STARTER CIRCUIT (STARTER - ST RELAY)