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Home › Lexus › 2011 › LS 460L AWD › Repair and Diagnosis › Engine Performance › System › Engine Control System (Diagnostic Codes (P1603-U0319) & Circuit Tests) › SFI System › Cranking Holding Function Circuit › Procedure

Cranking Holding Function Circuit: 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 → See step   13 

    A: Go to next step 

  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]. Refer to Engine does not Start .

    NG → See step   20 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (STARTER SIGNAL) 
    1. Connect the 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 SIG Engine Switch Position
      OFF on (IG)
      ON ENGINE START

    OK → See step   9 

    NG: Go to next step 

  4. INSPECT ECM (STAR AND STSW VOLTAGE) 
    1. Measure the voltage according to the value(s) in the table below while cranking the engine.
      Fig 1: Inspecting ECM (STAR And STSW Voltage)
      GTY267339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      Tester Connection Condition Specified Condition
      A14-2 (STAR) - E3-1 (E1) Cranking 11 to 14 V
      A14-27 (STSW) - E3-1 (E1) 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 → See step   14 

    C → See step   19 

    A: Go to next step 

  5. INSPECT STARTER CUT RELAY (ST CUT) 
    1. Remove the ST CUT relay from the engine room No. 2 relay block.
      Fig 2: Identifying Relay Terminals
      GTY102844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 → See step   15 

    OK: Go to next step 

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Disconnect the park/neutral position (PNP) switch connector.
      Fig 3: Inspecting Park/Neutral Position Switch Assembly
      GTY101716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      4 (B) - 5 (L) Shift position P Below 1 Ω
      4 (B) - 5 (L) Shift position N Below 1 Ω

    NG → See step   16 

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY (ST CUT) - PARK/NEUTRAL POSITION SWITCH, ECM) 
    1. Remove the ST CUT relay from the engine room No. 2 relay block.
      Fig 4: Checking Harness And Connector (Starter Cut Relay (ST CUT) - Park/Neutral Position Switch, ECM)
      GTY286120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E49 PNP switch connector.
    3. Disconnect the A14 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 CUT relay (3) - E49-4 (B) Always Below 1 Ω
      ST CUT relay (5) - A14-2 (STAR) Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified condition
      ST CUT relay (3) or E49-4 (B) - Body ground Always 10 kΩ or higher
      ST CUT relay (5) or A14-2 (STAR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY (ST CUT) - IGNITION RELAY NO. 2 (IG2), BODY GROUND) 
    1. Remove the IG2 relay from the engine room No. 2 relay block.
      Fig 5: Identifying ST CUT And IG2 Relays
      GTY281361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the ST CUT 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 relay (2) - IG2 relay (3) Always Below 1 Ω
      ST CUT relay (1) - Body ground Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified condition
      ST CUT relay (2) - Body ground Always 10 kΩ or higher
      IG2 relay (3) - Body ground Always 10 kΩ or higher

    NG → REPLACE ENGINE ROOM NO. 2 RELAY BLOCK, JUNCTION BLOCK 

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

  9. INSPECT STARTER RELAY (ST) 
    1. Remove the ST relay from the engine room No. 2 relay block.
      Fig 6: Identifying Relay Terminals
      GTY102844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 → See step   17 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - PARK/NEUTRAL POSITION SWITCH, BODY GROUND) 
    1. Remove the ST relay from the engine room No. 2 relay block.
      Fig 7: Checking Harness And Connector (Starter Relay (ST) - Park/Neutral Position Switch, Body Ground)
      GTY258411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E49 PNP 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 relay (1) - E49-5 (L) Always Below 1 Ω
      ST relay (2) - Body ground Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      ST relay (1) or E49-5 (L) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. INSPECT STARTER ASSEMBLY 
    1. Inspect the starter assembly. Refer to INSPECTION .

    NG → See step   18 

    OK: Go to next step 

  12. CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - STARTER RELAY (ST), BATTERY) 
    1. Remove the ST relay from the engine room No. 2 relay block.
      Fig 8: Identifying E25 And F1 Starter Connectors
      GTY288299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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 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 relay (3) or E25-1 - Body ground Always 10 kΩ or higher
      F1-1 or Battery cable (+) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  13. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  14. REPLACE ECM. Refer to  REMOVAL 
  15. REPLACE STARTER CUT RELAY (ST CUT). Refer to  ON-VEHICLE INSPECTION - Step 2 
  16. REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  REMOVAL 
  17. REPLACE STARTER RELAY (ST). Refer to  ON-VEHICLE INSPECTION - Step 2 
  18. REPLACE STARTER ASSEMBLY. Refer to  REMOVAL 
  19. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to  Engine does not Start 
  20. REPAIR SMART ACCESS SYSTEM WITH PUSH-BUTTON START (ENGINE DOES NOT START). Refer to  Engine does not Start 
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