SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

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

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

• Also, the certification ECU monitors the ST relay operating conditions based on the STA terminal voltage status.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK WHETHER ENGINE CAN BE CRANKED

   
   

   1. Check if the engine can be cranked.

      Result

      Result	Proceed to
      Engine cannot be cranked	A
      Engine can be cranked	B

   
   

   B

   READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL) Click here

   A

2. 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. Read the value displayed on the tester when the ignition switch is turned to the ON and START positions.

      OK
      Switch Position Starter Signal ON OFF START ON

      Result

      Result	Proceed to
      NG (for CVT)	A
      NG (for Manual Transaxle)	B
      OK	C

   
   

   B

   CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - ECM) Click here

   C

   CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) Click here

   A

3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - PARK/NEUTRAL POSITION SWITCH - ECM)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the B100 park/neutral position switch connector.

   3. Disconnect the B22 ECM connector (for LHD).

   4. Disconnect the B23 ECM connector (for RHD).

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition F65-5 (STAR) - B100-4 (B) Always Below 1 Ω F65-5 (STAR) - B22-63 (NSW) Always Below 1 Ω F65-5 (STAR), B100-4 (B) or B22-63 (NSW) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition F65-5 (STAR) - B100-4 (B) Always Below 1 Ω F65-5 (STAR) - B23-63 (NSW) Always Below 1 Ω F65-5 (STAR), B100-4 (B) or B23-63 (NSW) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - PARK/NEUTRAL POSITION SWITCH - POWER MANAGEMENT CONTROL ECU - ECM - ST RELAY)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the B100 park/neutral position switch connector.

   3. Disconnect the A52 power management control ECU connector.

   4. Disconnect the A58 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition F65-7 (STA) - B100-9 (L) Always Below 1 Ω F65-7 (STA) - A58-22 (STA) Always Below 1 Ω F65-7 (STA) - A52-5 (STA) Always Below 1 Ω F65-7 (STA) - Relay holder 2 Always Below 1 Ω F65-7 (STA), B100-9 (L), A58-22 (STA), A52-5 (STA) or Relay holder 2 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK POWER MANAGEMENT CONTROL ECU

   

   Text in Illustration

   *a	Front view of wire harness connector (to ECM)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the B100 park/neutral position switch connector.

   3. Disconnect the A58 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition A58-22 (STA) - Body ground Always 10 kΩ or higher

   
   

   OK

   GO TO ENTRY AND START SYSTEM (for Start Function) Click here

   NG

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - ECM)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the A39 clutch start switch assembly connector.

   3. Disconnect the B22 ECM connector (for LHD).

   4. Disconnect the B23 ECM connector (for RHD).

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition F65-5 (STAR) - A39-2 Always Below 1 Ω F65-5 (STAR) - B22-63 (NSW) Always Below 1 Ω F65-5 (STAR), A39-2 or B22-63 (NSW) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition F65-5 (STAR) - A39-2 Always Below 1 Ω F65-5 (STAR) - B23-63 (NSW) Always Below 1 Ω F65-5 (STAR), A39-2 or B23-63 (NSW) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ECM - ST RELAY)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the A39 clutch start switch assembly connector.

   3. Disconnect the A52 power management control ECU connector.

   4. Disconnect the A58 ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition F65-7 (STA) - A39-1 Always Below 1 Ω F65-7 (STA) - A58-22 (STA) Always Below 1 Ω F65-7 (STA) - A52-5 (STA) Always Below 1 Ω F65-7 (STA) - Relay holder 2 Always Below 1 Ω F65-7 (STA), A39-1, A58-22 (STA), A52-5 (STA) or Relay holder 2 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

8. CHECK POWER MANAGEMENT CONTROL ECU

   

   Text in Illustration

   *a	Front view of wire harness connector (to ECM)

   
   

   1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

   2. Disconnect the A39 clutch start switch assembly connector.

   3. Disconnect the ECM connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition A58-22 (STA) - Body ground Always 10 kΩ or higher

   
   

   OK

   GO TO ENTRY AND START SYSTEM (for Start Function) Click here

   NG

   REPLACE POWER MANAGEMENT CONTROL ECU Click here

9. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)

   

   Text in Illustration

   *1	Engine room relay Block
   *2	Relay holder (ST relay)

   
   

   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 Relay holder 5 - Body ground Always 11 to 14 V

   
   

   NG

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

   OK

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

    
    

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

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 1 - Body ground Always Below 1 Ω

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

11. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)

    
    

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

    2. Disconnect the B1 starter assembly connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 3 - B1-1 Always Below 1 Ω Relay holder 3 or B1-1 - Body ground Always 10 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

12. CHECK HARNESS AND CONNECTOR (BATTERY - STARTER ASSEMBLY)

    
    

    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the cable from the positive (+) battery terminal.

    3. Disconnect the B53 starter assembly connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Positive (+) battery terminal - B53-1 Always Below 1 Ω

       Result

       Result	Proceed to
       OK (for CVT)	A
       OK (for Manual Transaxle)	B
       NG	C

    
    

    B

    CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

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

    
    

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

    2. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

    3. Disconnect the B100 park/neutral position switch connector.

    4. Disconnect the A52 power management control ECU connector.

    5. Disconnect the A58 ECM connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 2 - B100-9 (L) Always Below 1 Ω

    
    

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

14. CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY)

    
    

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

    2. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

    3. Disconnect the A39 clutch start switch assembly connector.

    4. Disconnect the A52 power management control ECU connector.

    5. Disconnect the A58 ECM connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 2 - A39-1 Always Below 1 Ω

    
    

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

15. 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. Read the value displayed on the tester when the ignition switch is turned to the ON and START positions.

       OK
       Switch Position Starter Signal ON OFF START ON

       Result

       Result	Proceed to
       OK	A
       NG (for CVT)	B
       NG (for Manual Transaxle)	C

    
    

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    CHECK HARNESS AND CONNECTOR (ST RELAY - ECM) Click here

    B

16. CHECK HARNESS AND CONNECTOR (ST RELAY - ECM)

    
    

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

    2. Disconnect the A58 ECM connector.

    3. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

    4. Disconnect the B100 park/neutral position switch connector.

    5. Disconnect the A52 power management control ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 2 - A58-22 (STA) Always 10 kΩ or higher

    
    

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

17. CHECK HARNESS AND CONNECTOR (ST RELAY - ECM)

    
    

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

    2. Disconnect the A58 ECM connector.

    3. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

    4. Disconnect the A39 clutch start switch assembly connector.

    5. Disconnect the A52 power management control ECU connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition Relay holder 2 - A58-22 (STA) Always 10 kΩ or higher

    
    

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR