SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

w/ Entry and Start System

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

• When the smart key ECU assembly detects the STSW signal, the smart key ECU assembly 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 smart key ECU assembly receives a stable engine speed signal (NE signal), more specifically, when the NE signal reaches a predetermined value, the smart key ECU assembly stops outputting the STAR signal.

• Also, the smart key ECU assembly monitors the starter relay operating conditions based on the STA terminal voltage status.

WIRING DIAGRAM

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

   
   

   1. Connect the 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	A
      Within standard range (for Manual Transaxle)	B
      Within standard range (for CVT)	C

   
   

   B

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

   C

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

   A

2. INSPECT INTELLIGENT TESTER (STARTER SIGNAL)

   
   

   1. Disconnect the engine stop and start ECU or power management control ECU connector.

   2. Connect the 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 (for Manual Transaxle)	A
      NG (for CVT)	B
      OK (w/ Stop and Start System)	C
      OK (w/o Stop and Start System)	D

   7. Reconnect the engine stop and start ECU connector.

   
   

   B

   INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

   C

   REPLACE ENGINE STOP AND START ECU Click here

   D

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

   A

3. INSPECT CLUTCH START SWITCH ASSEMBLY

   
   

   1. Inspect the clutch start switch assembly Click here.

   
   

   NG

   REPLACE CLUTCH START SWITCH ASSEMBLY Click here

   OK

4. CHECK HARNESS AND CONNECTOR (SMART KEY ECU ASSEMBLY - CLUTCH START SWITCH)

   
   

   1. Disconnect the smart key ECU assembly 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 F65-5 (STAR) - A39-2 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition F65-5 (STAR) or A39-2 - Body ground Always 10 kΩ or higher

   4. Reconnect the smart key ECU assembly 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 - A58-22 (STA) Always Below 1 Ω ST relay terminal 2 - A39-1 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A58-22 (STA) or A39-1 - 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.

   
   

   OK

   CHECK ENTRY AND START SYSTEM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

   

   Text in Illustration

   *a	Component without harness connected (Park/Neutral Position Switch Assembly)

   
   

   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 (B) - 9 (L) Shift position P, N Below 1 Ω 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 AND REPLACE HARNESS AND CONNECTOR (SMART KEY ECU ASSEMBLY - PARK/NEUTRAL POSITION SWITCH)

   
   

   1. Disconnect the smart key ECU assembly 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 F65-5 (STAR) - B69-4 (B) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition F65-5 (STAR) or B69-4 (B) - Body ground Always 10 kΩ or higher

   4. Reconnect the smart key ECU assembly 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 - A58-22 (STA) Always Below 1 Ω ST relay terminal 2 - B69-9 (L) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A58-22 (STA) or B69-9 (L) - 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.

   
   

   OK

   CHECK ENTRY AND START SYSTEM Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

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 - A58-22 (STA) Always Below 1 Ω ST relay terminal 2 - A39-1 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A58-22 (STA) or A39-1 - 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.

   
   

   A

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   B

   INSPECT BATTERY Click here

10. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - 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 - A58-22 (STA) Always Below 1 Ω ST relay terminal 2 - B69-9 (L) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A58-22 (STA) or B69-9 (L) - 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.

    
    

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

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.

    
    

    OK

    REPAIR OR REPLACE STARTER CIRCUIT (STARTER - ST RELAY)

    NG

    REPAIR OR REPLACE BATTERY TERMINAL