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Home >> Lexus >> 2008 >> ES 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System & Component Testing, Removal, Inspection & Installation >> Cranking Holding Function Circuit >> Inspection Procedure
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Inspection Procedure

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

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step. 

  2. READ VALUE OF TECHSTREAM (STA SIGNAL) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Powertrain / Engine / Data List / Starter Signal. Read the values.
    5. Check the result when the engine switch is turned on (IG) and when the engine is started.

      Standard 

      STARTER SIG REFERENCE

      Display (STARTER SIG) Condition
      OFF Engine switch on (IG)
      ON Engine start

    OK:  Go to step  7

    NG: Go to next step. 

  3. INSPECT ECM (STSW VOLTAGE) 
    1. Disconnect the A10 ECM Connector.
    2. Measure the voltage between the specified terminal of the ECM connector and body ground while cranking the engine.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (A10-14) - Body ground 9 to 14 V
      Fig 1: Identifying Terminals Of A10 ECM Connector
      G05247869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reconnect the ECM connector. NG

    NG:  Go to step  11

    OK: Go to next step. 

  4. INSPECT ECM (STAR VOLTAGE) 
    1. Remove the ST CUT relay from the engine room R/B.
    2. Measure the voltage between the specified terminal of the engine room R/B and body ground while cranking the engine.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      ST CUT relay (3) - Body ground 9 to 14 V
      Fig 2: Identifying Terminals Of A10 ECM Connector
      G04973819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the ST CUT relay. NG

    NG:  Go to step  8

    OK: Go to next step. 

  5. INSPECT ST CUT RELAY 
    1. Remove the ST CUT relay from the engine room R/B.
    2. Measure the resistance between the terminals.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
      Fig 3: Identifying ST CUT Relay
      G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the ST CUT relay.

    NG: REPLACE ST CUT RELAY 

    OK: Go to next step. 

  6. INSPECT PARK/NEUTRAL SWITCH ASSEMBLY 
    1. Inspect the Park/Neutral Position (PNP) switch.
      1. Disconnect the B36 switch connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Gear Selector Lever Position Tester Connection Specified Condition
        P 4 - 5 Below 1 Ω
        N 4 - 5 Below 1 Ω
        Fig 4: Identifying Terminals Of B36 Park/Neutral Position Switch Connector
        G05247754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Reconnect the PNP switch connector.

    NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY  (See REMOVAL )

    OK: CHECK HARNESS AND CONNECTOR 

  7. INSPECT STARTER RELAY 
    1. Remove the ST relay from the engine room R/B.
    2. Measure the resistance between the terminals.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
      Fig 5: Identifying ST Relay Terminals
      G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Reinstall the ST relay.

    NG: REPLACE STARTER RELAY 

    OK: Go to next step. 

  8. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY) 
    1. Disconnect the B36 park/neutral position switch connector.
    2. Remove the ST relay from the engine room R/B.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      B36-9 - ST relay terminal (1) Below 1 Ω

      Standard Resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      B36-9 or ST relay terminal (1) - Body ground 10 kΩ or higher
      Fig 6: Identifying Terminals Of B36 Park/Neutral Position Switch Connector
      G05835587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reinstall the ST relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  9. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE) 
    1. Remove the ST relay from the engine room R/B.
    2. Measure the voltage between the specified terminal of the engine room R/B and body ground.

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      ST relay (5) - Body ground 9 to 14 V
      Fig 7: Identifying ST (Starter) Relay
      G04973652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  10. INSPECT STARTER ASSEMBLY 

    NG: REPAIR OR REPLACE STARTER ASSEMBLY 

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

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) 
    1. Disconnect the E58 main body ECU connector.
    2. Disconnect the A10 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (E58-4) - STSW (A10-14) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (E58-4) or STSW (A10-14) - Body ground 10 kΩ or higher
      Fig 8: Identifying Terminals Of E58 Main Body ECU Connector
      G05247876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the main body ECU connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK:  GO TO "SMART ACCESS SYSTEM WITH PUSH-BUTTON START ".

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