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Home >> Toyota >> 2008 >> Avalon Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2GR-FE) - System And Circuit Testing, On-Vehicle Inspection, 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  (See 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 ignition switch on (IG).
    3. Turn the tester on.
    4. Select the following menu items: Powertrain / Engine / Data List / All Data / Starter Signal. Read the values.
    5. Check the result when the ignition switch is turned on (IG) and when the engine is started.

    Standard 

    IGNITION SWITCH POSITION CHART

    Display (STARTER SIG) Ignition Switch Position
    OFF ON
    ON START

    OK:  Go to step  7

    NG: Go to next step 

  3. INSPECT ECM (STSW VOLTAGE) 
    1. Disconnect the A55 ECM Connector.
    2. Measure the voltage between the terminal of the ECM connector and body ground while cranking the engine.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (A55-14) - Body ground 9 to 14 V
    3. Reconnect the ECM connector.

    NG:  Go to step  11

    Fig 1: Identifying ECM Connector
    G04973818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 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
    3. Reinstall the ST CUT relay.

    NG:  Go to step  8

    Fig 2: Identifying ST CUT Relay From Engine Room R/B
    G05404762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 (Battery voltage applied to terminals 1 and 2)
    3. Reinstall the ST CUT relay.

    NG: REPLACE ST CUT RELAY 

    Fig 3: Inspecting ST CUT Relay From Engine Room R/B
    G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  6. INSPECT PARK/NEUTRAL SWITCH ASSEMBLY 
    1. Inspect the Park / Neutral Position (PNP) switch.
      1. Disconnect the 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 - 9 Below 1 Ω
        N 4 - 9 Below 1 Ω
      3. Reconnect the PNP switch connector.

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

    Fig 4: Identifying PNP Switch Connector
    G05404764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 (Battery voltage applied to terminals 1 and 2)
    3. Reinstall the ST relay.

    NG: REPLACE STARTER RELAY 

    Fig 5: Inspecting Starter Relay
    G04942976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH - STARTER RELAY) 
    1. Disconnect the park/neutral position switch connector.
    2. Remove the ST relay from the engine room R/B.
    3. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      B13-9 - ST relay terminal (1) Below 1 Ω

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      B13-9 or ST relay terminal (1) - Body ground 10 kΩ or higher
    4. Reinstall the ST relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Identifying Park/Neutral Position Switch Connector
    G05404766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 terminal of the engine room R/B and body ground.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      ST relay (1) - Body ground 9 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 7: Identifying ST Relay From Engine Room R/B
    G05404767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 main body ECU connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance between the terminals.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (D44-39) - STSW (A55-14) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      STSW (D44-39) or STSW (A55-14) - Body ground 10 kΩ or higher
    4. Reconnect the main body ECU connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 8: Identifying Main Body ECU Connector And ECM Connector
    G05404768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to SMART KEY SYSTEM  (See SMART KEY SYSTEM )

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