LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2013 >> IS 250 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P062F - U0101) & Circuit Tests)) >> SFI System >> Circuit Tests >> Cranking Holding Function Circuit >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Cranking Holding Function Circuit: Procedure

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

      Result

      Result Proceed to
      NG A
      OK B

    B → See step   17 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (STA SIGNAL) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine / Data List / All Data / 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
      Close (Starter signal off) On (IG)
      Open (Starter signal on) Engine start

      Result

      Result Proceed to
      NG A
      OK B

    B → See step   10 

    A: Go to next step 

  3. INSPECT ECM (STAR AND STSW VOLTAGE) 
    1. Measure the voltage according to the value(s) in the table below while cranking the engine.
      GTY131166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      E4-4 (STAR) - Body ground Cranking 5.5 V or more
      A5-19 (STSW) - Body ground Cranking 8 to 14 V

      Result

      Terminal STAR Terminal STSW Proceed to
      5.5 V or more 8 to 14 V A
      0 V 8 to 14 V B
      0 V 0 V C

    B → See step   18 

    C → See step   16 

    A: Go to next step 

  4. INSPECT ST CUT RELAY 
    1. Inspect the ST CUT relay. Refer to ON-VEHICLE INSPECTION [08/2012 - ] .

    NG → REPLACE ST CUT RELAY 

    OK: Go to next step 

  5. INSPECT PARK/NEUTRAL POSITION SWITCH 
    1. Inspect the park/neutral position switch. Refer to INSPECTION [08/2012 - ] for A760H. Refer to INSPECTION [08/2012 - ] for A960E).

      Result

      Result Proceed to
      OK A
      NG (for A760H) B
      NG (for A960E) C

    B → See step   21 

    C → See step   22 

    A: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (ST CUT RELAY POWER SOURCE) 
    1. Remove the ST CUT relay from the engine room R/B No. 2.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      ST CUT relay terminal 2 - Body ground Engine switch on (IG) 11 to 14 V
    4. Reinstall the ST CUT relay.

    NG → See step   10 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - BODY GROUND) 
    1. Remove the ST CUT relay from the engine room R/B No. 2.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      ST CUT relay terminal 1 - Body ground Always Below 1 Ω
    3. Reinstall the ST CUT relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (ECM - ST CUT RELAY - POWER SOURCE CONTROL ECU) 
    1. Disconnect the E4 ECM connector.
    2. Remove the ST CUT relay from the engine room R/B No. 2.
    3. Disconnect the J55 power source control ECU connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      E4-4 (STAR) - ST CUT relay terminal 3 Always Below 1 Ω
      E4-4 (STAR) - J55-15 (STR2) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      E4-4 (STAR) or ST CUT relay terminal 3 or J55-15 (STR2) - Body ground Always 10 kΩ or higher
    5. Reinstall the ST CUT relay.
    6. Reconnect the ECM connector.
    7. Reconnect the power source control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ST CUT RELAY - POWER SOURCE CONTROL ECU) 
    1. Disconnect the E45 park/neutral position switch connector.
    2. Remove the ST CUT relay from the engine room R/B No. 2.
    3. Disconnect the J55 power source control ECU connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      E45-4 - ST CUT relay terminal 5 Always Below 1 Ω
      E45-4 - J55-17 (STR1) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      E45-4 or ST CUT relay terminal 5 or J55-17 (STR1) - Body ground Always 10 kΩ or higher
    5. Reconnect the park/neutral position switch connector.
    6. Reinstall the ST CUT relay.
    7. Reconnect the power source control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM) 

  10. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - POWER SOURCE CONTROL ECU) 
    1. Remove the ST CUT relay from the engine room R/B No. 2.
    2. Disconnect the J55 power source control ECU 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 relay terminal 2 - J55-35 (IG2D) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      ST CUT relay terminal 2 or J55-35 (IG2D) - Body ground Always 10 kΩ or higher
    4. Reinstall the ST CUT relay.
    5. Reconnect the power source control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START 

  11. INSPECT STARTER RELAY 
    1. Inspect the STARTER relay. Refer to ON-VEHICLE INSPECTION [08/2012 - ] .

    NG → REPLACE STARTER RELAY 

    OK: Go to next step 

  12. CHECK HARNESS AND CONNECTOR (STARTER RELAY - BODY GROUND) 
    1. Remove the STARTER relay from the engine room R/B No. 1.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      STARTER relay terminal 2 - Body ground Always Below 1 Ω
    3. Reinstall the STARTER relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY) 
    1. Disconnect the E45 park/neutral position switch connector.
    2. Remove the STARTER relay from the engine room R/B No. 1.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      E45-5 - STARTER relay terminal 1 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      E45-5 or STARTER relay terminal 1 - Body ground Always 10 kΩ or higher
    4. Reconnect the park/neutral position switch connector.
    5. Reinstall the STARTER relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  14. INSPECT ENGINE ROOM RELAY BLOCK NO. 1 (STARTER RELAY VOLTAGE) 
    1. Remove the STARTER relay from the engine room R/B No. 1.
      GTY141798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      STARTER relay terminal 5 - Body ground Always 11 to 14 V
    3. Reinstall the STARTER relay.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - BATTERY) 

    OK: Go to next step 

  15. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly. Refer to INSPECTION [08/2012 - ] .

    NG → See step   19 

    OK → REPAIR OR REPLACE HARNESS AND CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY) 

  16. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM) 
    1. Disconnect the J55 power source control ECU connector.
    2. Disconnect the A5 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
      J55-39 (STSW) - A5-19 (STSW) Always Below 1 Ω

      Standard resistance (Check for Short)

      Tester Connection Condition Specified Condition
      J55-39 (STSW) or A5-19 (STSW) - Body ground Always 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the power source control ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  17. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2012 - ] 
  18. REPLACE ECM. Refer to  REMOVAL [08/2012 - ] 
  19. REPAIR OR REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [08/2012 - ] 
  20. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2012 - ] 
  21. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to  REMOVAL [08/2012 - ] 
  22. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to  REMOVAL [08/2012 - ] 
scientia non olet · About LEMON Manuals