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Cranking Holding Function Circuit: Procedure

  1. READ VALUE USING TECHSTREAM (STARTER SIGNAL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Engine and ECT / Data List / All Data / Starter Signal.
    5. Check the result when the ignition switch is turned to ON and START positions.

      OK

      Ignition Switch Condition Starter Signal
      ON Close
      START Open

    NG → See step   2 

    OK → See step   13 

  2. INSPECT ECM (STSW TERMINAL VOLTAGE) 
    Fig 1: Identifying ECM Connector
    GTY162592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM connector.
    2. Perform the cranking operation.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A21-14 (STSW) - Body ground Ignition switch ON Below 1 V
      Ignition switch START 9 to 13 V
    4. Reconnect the ECM connector.

      HINT: 

      DTCs related to the communication with other computers may be set due to this inspection. Clear those DTCs after the inspection.

    NG → See step   7 

    OK: Go to next step 

  3. INSPECT ECM (STAR TERMINAL OUTPUT VOLTAGE) 
    Fig 2: Identifying Junction Connector Terminals
    GTY160775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the All Cylinders Fuel Cut.
    5. Move the shift lever to the P or N position (for automatic transaxle models).
    6. Fully depress the clutch pedal (for manual transaxle models).
    7. Measure the voltage according to the value(s) in the table below.

      Standard Voltage (for automatic transaxle models)

      Tester Connection Switch Condition Specified Condition
      10 (Junction Connector) - Body ground Ignition switch ON (P or N position) Below 1 V
      Cranking operation 9 to 13 V

      Standard Voltage (for manual transaxle models)

      Tester Connection Switch Condition Specified Condition
      A17-2 - Body ground Ignition switch ON (Accelerator pedal Fully depressed) Below 1 V
      Cranking operation 9 to 13 V
      Fig 3: Identifying Clutch Start Switch Connector Terminals
      GTY160776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      • The junction connector is in the engine room relay block and junction block as the illustration above.
      • During this inspection, all connectors and relays should be connected.

    NG → See step   8 

    OK: Go to next step 

  4. INSPECT CLUTCH START SWITCH OR PARK/NEUTRAL POSITION SWITCH 
    Fig 4: Identifying Park/Neutral Position Switch Connector Terminals
    GTY165633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Inspect the Park/Neutral Position (PNP) switch connector (for automatic transaxle models).
      1. Disconnect the park/neutral position switch connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Shift Selector Lever Position Specified Condition
        2-6, 4-5 P Below 1 Ω
        1-2 R
        2-9, 4-5 N
        2-7 D
        2-3 2
        2-8 L
        Except above terminals All Positions 10 kΩ or higher
      3. Reconnect the park/neutral position switch connector.
    2. Inspect the clutch start switch (for manual transaxle models).
      Fig 5: Identifying Clutch Start Switch Connector Terminals
      GTY161104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the clutch start switch connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Switch Condition Specified Condition
        1 - 2 ON (Pushed) Below 1 Ω
        1 - 2 OFF (Not pushed) 10 kΩ or higher
      3. Reconnect the clutch start switch connector.

        Result

        Result Proceed to
        Outside standard range A
        Within standard range (for automatic transaxle models) B
        Within standard range (for manual transaxle models) C

    C → See step   6 

    B → See step   5 

    A → REPLACE CLUTCH START SWITCH OR PARK/NEUTRAL POSITION SWITCH 

  5. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM) 
    Fig 6: Identifying Connector Terminals Park/Neutral Position Switch - ECM
    GTY163752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Park/Neutral Position (PNP) switch connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C28-4 - C19-52 (STAR) Always Below 1 Ω
    4. Reconnect the PNP switch connector.
    5. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH OR PNP SWITCH - ECM - ST RELAY) 
    Fig 7: Identifying Park/Neutral Position Switch Connector Terminals
    GTY160777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and connector (for automatic transaxle models).
      1. Remove the ST relay from the engine room relay block.
      2. Disconnect the Park/Neutral Position (PNP) switch connector.
      3. Disconnect the ECM connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 8: Identifying ST Relay Connector Terminals
        GTY160779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Resistance (Check for Open)

        Tester Connection Condition Specified Condition
        C28-5 - A21-48 (STA) Always Below 1 Ω
        C28-5 - 2 (ST relay) Always Below 1 Ω
        1 (ST relay) - Body ground Always Below 1 Ω
      5. Reinstall the ST relay.
      6. Reconnect the park/neutral position switch connector.
      7. Reconnect the ECM connector.
      Fig 9: Identifying Clutch Start Switch Connector Terminals
      GTY160778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the harness and connector (for manual transaxle models).
      1. Remove the ST relay from the engine room relay block.
      2. Disconnect the clutch start switch connector.
      3. Disconnect the 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
        A17-1 - A21-48 (STA) Always Below 1 Ω
        A17-1 - 2 (ST relay) Always Below 1 Ω
        1 (ST relay) - Body ground Always Below 1 Ω
      5. Reinstall the ST relay.
      6. Reconnect the clutch start switch connector.
      7. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPAIR OR REPLACE STARTER CIRCUIT (STARTER - ST RELAY) 

  7. INSPECT IGNITION SWITCH 
    Fig 10: Identifying Ignition Switch Connector Terminals
    GTY161599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ignition switch.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      All terminals LOCK 10 kΩ or higher
      2 (ACC) - 4 (AM1) ACC Below 1 Ω
      1 (IG1) - 2 (ACC) - 4 (AM1) ON
      5 (AM2) - 6 (IG2)
      1 (IG1) - 3 (ST1) - 4 (AM1) START
      5 (AM2) - 6 (IG2) - 7 (ST2)
    3. Reinstall the ignition switch.

    NG → See step   12 

    OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - ECM) 

  8. INSPECT CLUTCH START SWITCH OR PARK/NEUTRAL POSITION SWITCH 
    Fig 11: Identifying Park/Neutral Position Switch Connector Terminals
    GTY165633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Inspect the Park/Neutral Position (PNP) switch connector (for automatic transaxle models).
      1. Disconnect the park/neutral position switch connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Shift Selector Lever Position Specified Condition
        2-6, 4-5 P Below 1 Ω
        1-2 R
        2-9, 4-5 N
        2-7 D
        2-3 2
        2-8 L
        Except above terminals All Positions 10 kΩ or higher
      3. Reconnect the park/neutral position switch connector.
    2. Inspect the clutch start switch (for manual transaxle models).
      Fig 12: Identifying Clutch Start Switch Connector Terminals
      GTY161104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Disconnect the clutch start switch connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Switch Condition Specified Condition
        1 - 2 ON (Pushed) Below 1 Ω
        1 - 2 OFF (Not pushed) 10 kΩ or higher
      3. Reconnect the clutch start switch connector.

    NG → REPLACE CLUTCH START SWITCH OR PARK/NEUTRAL POSITION SWITCH 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH OR PNP SWITCH - IGNITION SWITCH AND ECM) 
    Fig 13: Identifying Clutch Start Switch, PNP Switch And Ignition Switch Connector Terminals
    GTY161021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and connector (for automatic transaxle models).
      1. Disconnect the ignition switch connector.
      2. Disconnect the Park/Neutral Position (PNP) switch connector
      3. Disconnect the 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
        F9-7 (ST2) - C28-4 Always Below 1 Ω
        C19-52 (STAR) - C28-4 Always

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        F9-7 (ST2) or C28-4 - Body ground Always 10 kΩ or higher
        C19-52 (STAR) or C28-4 - Body ground Always

        HINT: 

        The wire between the park/neutral position switch and the ignition switch has a diode WIRING DIAGRAM . The current flowing to the park/ neutral position switch is rectified by the diode.

      5. Reconnect the ignition switch connector.
      6. Reconnect the clutch start switch connector.
      7. Reconnect the ECM connector.
    2. Check the harness and connector (for manual transaxle models).
      1. Disconnect the ignition switch connector.
      2. Disconnect the clutch start switch connector.
      3. Disconnect the 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
        F9-7 (ST2) - A17-2 Always Below 1 Ω
        C19-52 (STAR) - A17-2 Always

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        F9-7 (ST2) or A17-2 - Body ground Always 10 kΩ or higher
        C19-52 (STAR) or A17-2 - Body ground Always

        HINT: 

        The wire between the clutch start switch and the ignition switch has a diode refer toWIRING DIAGRAM . The current flowing to the clutch start switch is rectified by the diode.

      5. Reconnect the ignition switch connector.
      6. Reconnect the clutch start switch connector.
      7. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH OR PNP SWITCH - ECM - ST RELAY) 
    Fig 14: Identifying Park/Neutral Position Switch Connector Terminals
    GTY160777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and connector (for automatic transaxle models).
      1. Remove the ST relay from the engine room relay block.
      2. Disconnect the Park/Neutral Position (PNP) switch connector.
      3. Disconnect the ECM connector.
      4. Measure the resistance according to the value(s) in the table below.
        Fig 15: Identifying ST Relay Connector Terminals
        GTY160779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        C28-5 or A21-48 (STA) - Body ground Always 10 kΩ or higher
        C28-5 or 2 (ST relay) - Body ground Always 10 kΩ or higher
      5. Reinstall the ST relay.
      6. Reconnect the park/neutral position switch connector.
      7. Reconnect the ECM connector.
      Fig 16: Identifying Clutch Start Switch Connector Terminals
      GTY160778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the harness and connector (for manual transaxle models).
      1. Remove the ST relay from the engine room relay block.
      2. Disconnect the clutch start switch connector.
      3. Disconnect the ECM connector.
      4. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        A17-1 or A21-48 (STA) - Body ground Always 10 kΩ or higher
        A17-1 or 2 (ST relay) - Body ground Always 10 kΩ or higher
      5. Reinstall the ST relay.
      6. Reconnect the clutch start switch connector.
      7. Reconnect the ECM connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   11 

  11. REPLACE ECM. Refer to  REMOVAL 
  12. REPLACE IGNITION SWITCH. Refer to  REMOVAL 
  13. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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