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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 / Data List / Starter Signal.
    5. Check the result when the ignition switch is turned to ON and START positions.

      OK

      Ignition Switch Condition Starter Signal
      ON OFF
      START ON

    NG → See step   2 

    OK → See step   14 

  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 stored 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) 
    1. Connect the Techstream to the DLC3.
      Fig 2: Identifying Junction Connector Terminals
      GTY310895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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).
    6. Fully depress the clutch pedal (for Manual Transaxle).
    7. Measure the voltage according to the value(s) in the table below.

      Standard Voltage (for Automatic Transaxle)

      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)

      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

      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 3: 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).
      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).
      Fig 4: 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
        (for Automatic Transaxle)        		 A
        Outside standard range
        (for Manual Transaxle)        		 B
        Within standard range
        (for Automatic Transaxle)        		 C
        Within standard range
        (for Manual Transaxle)        		 D

    B → See step   15 

    C → See step   5 

    D → See step   6 

    A → See step   13 

  5. CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM) 
    Fig 5: 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 6: Identifying Park/Neutral Position Switch Connector Terminals
    GTY160777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and connector (for Automatic Transaxle).
      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 7: Identifying ST Relay Connector Terminals
        GTY311756Courtesy 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 8: Identifying Clutch Start Switch Connector Terminals
      GTY160778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the harness and connector (for Manual Transaxle).
      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 9: 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   11 

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

  8. INSPECT CLUTCH START SWITCH OR PARK/NEUTRAL POSITION SWITCH 
    Fig 10: 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).
      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).
      Fig 11: 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 12: 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).
      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 (refer to the 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).
      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 to the wiring 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 13: Identifying Park/Neutral Position Switch Connector Terminals
    GTY160777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the harness and connector (for Automatic Transaxle).
      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 14: Identifying ST Relay Connector Terminals
        GTY311756Courtesy 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 15: Identifying Clutch Start Switch Connector Terminals
      GTY160778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the harness and connector (for Manual Transaxle).
      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   12 

  11. REPLACE IGNITION SWITCH. Refer to  REMOVAL 
  12. REPLACE ECM. Refer to  REMOVAL 
  13. REPLACE PARK/NEUTRAL POSITION SWITCH (for Automatic Transaxle). Refer to  REMOVAL 
  14. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  15. REPLACE CLUTCH START SWITCH (for Manual Transaxle). Refer to  REMOVAL 
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