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Home >> Toyota >> 2008 >> Yaris Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System (1NZ-FE) >> SFI System >> Cranking Holding Function Circuit >> Inspection Procedure

Inspection Procedure

  1. READ VALUE USING TECHSTREAM (STARTER SIGNAL) 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the tester ON.
    3. Turn the tester ON.
    4. Select the following menu items: 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.

      Standard 

      IGNITION SWITCH POSITIONS CHART

      Ignition Switch Position Starter Signal
      ON OFF
      START ON

    OK:  Go to step  12

    NG: Go to Next Step 

  2. INSPECT ECM (STSW VOLTAGE) 
    1. Disconnect the A21 ECM connector.
      2. Fig 1: Identifying ECM Connector Terminals
      G04828348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the terminals of the ECM connector and body ground while cranking the engine.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      STSW (A21-14) - Body ground 11 to 14 V

      Result 

      RESULT CHART

      Result Proceed To
      Within standard range(A/T) A
      Within standard range (M/T) B
      Outside standard range C
    3. Reconnect the ECM connector.

    B:  Go to step  6

    C:  Go to step  9

    A: Go to Next Step 

  3. INSPECT ECM (STAR VOLTAGE) 
    1. Disconnect the C27 Park/Neutral Position (PNP) switch connector.
      2. Fig 2: Identifying PNP Switch Connector Terminals
      G04828349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the terminals of the PNP switch connector and body ground while cranking the engine.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      B (C27-4) - Body ground 11 to 14 V
    3. Reconnect the PNP switch connector.

    NG:  Go to step  10

    OK: Go to Next Step 

  4. INSPECT PARK/NEUTRAL POSITION SWITCH 
    1. Disconnect the C27 PNP switch connector.
      2. Fig 3: Identifying PNP Switch Connector Terminals
      G04828203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance between each terminal shown below when the shift lever is moved to each range.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Shift Position Tester Connections Specified Conditions
      P PL (6) - RB (2) Below 1 Ω
      L (5) - B (4)
      R RL (1) - RB (2)
      N NL (9) - RB (2)
      L (5) - B (4)
      D DL (7) - RB (2)
      2 2L (3) - RB (2)
      L LL (8) - RB (2)
    3. Reconnect the PNP switch connector.

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

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM) 
    1. Disconnect the C27 PNP switch connector.
      2. Fig 4: Identifying C27 PNP Switch Connector And A21 ECM Connector Terminals
      G05590774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A21 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (C27-5) - STA (A21-48) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (C27-5) or STA (A21-48) - Body ground 10 kΩ or higher
    4. Reconnect the PNP switch connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

  6. INSPECT ECM (STAR VOLTAGE) 
    1. Disconnect the A16 clutch start switch connector.
      2. Fig 5: Identifying Clutch Start Switch Connector Terminals
      G04828352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the terminals of the clutch start switch connector and body ground while cranking the engine.

      Standard voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      B (A16-2) - Body ground 11 to 14 V
    3. Reconnect the clutch start switch connector.

    NG:  Go to step  11

    OK: Go to Next Step 

  7. INSPECT CLUTCH START SWITCH 
    1. Disconnect the A16 clutch start switch connector.
      2. Fig 6: Identifying Clutch Start Switch
      G05590776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance between the terminals of the clutch start switch.

      Standard resistance 

      SWITCH POSITIONS SPECIFIED CONDITIONS CHART

      Switch Positions Specified Conditions
      Pushed in Below 1 Ω
      Released 10 kΩ or higher
    3. Reconnect the clutch start switch connector.

    NG: REPLACE CLUTCH START SWITCH  (See INSPECTION )

    OK: Go to Next Step 

  8. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM) 
    1. Disconnect the A16 clutch start switch connector.
      2. Fig 7: Identifying Clutch Start Switch And ECM Connector Terminals
      G04828354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A21 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (A16-1) - STA (A21-48) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (A16-1) or STA (A2-M8) - Body ground 10 kΩ or higher
    4. Reconnect the clutch start switch connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

  9. INSPECT IGNITION SWITCH 
    1. Disconnect the D8 ignition switch connector.
      2. Fig 8: Identifying Ignition Switch Assembly
      G04828355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance between the terminals shown below.

      Standard resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Key Positions Tester Connections Specified Conditions
      LOCK - 10 kΩ or higher
      ACC 2-4 Below 1 Ω
      ON 1-2-4
      5-6
      START 1-3-4
      5-6-7
    3. Reconnect the ignition switch connector.

    NG: REPLACE IGNITION SWITCH  (See REMOVAL )

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

  10. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - PARK/NEUTRAL POSITION SWITCH - ECM) 
    Fig 9: Identifying Harness And Connector (Ignition Switch - Park/Neutral Position Switch - ECM)
    G04828356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D8 ignition switch connector.
    2. Disconnect the C27 PNP switch connector.
    3. Disconnect the C20 ECM connector.
    4. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      ST2 (D8-7) - B (C27-4) Below 1 Ω
      STAR (C20-52) - B (C27-4)
      STAR (C20-52) - L (C27-5)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      ST2 (D8-7) or B (C27-4) - Body ground 10 kΩ or higher
      STAR (C20-52) or B (C27-4) - Body ground
      STAR (C20-52) or L (C27-5) - Body ground
    5. Reconnect the ignition switch connector.
    6. Reconnect the PNP switch connector.
    7. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

  11. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CLUTCH START SWITCH - ECM) 
    Fig 10: Identifying Harness And Connector (Ignition Switch - Clutch Start Switch - ECM)
    G04828357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D8 ignition switch connector.
    2. Disconnect the A16 clutch start switch connector.
    3. Disconnect the C20 ECM connector.
    4. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      ST2 (D8-7) - B (A16-2) Below 1 Ω
      STAR (C20-52) - B (A16-2)
      STAR (C20-52) - L (A16-1)

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      ST2 (D8-7) or B (A16-2) - Body ground 10 kΩ or higher
      STAR (C20-52) or B (A16-2) - Body ground
      STAR (C20-52) or L (A16-1) - Body ground
    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: REPLACE ECM (See  REMOVAL   ) 

  12. INSPECT BATTERY 
    1. Check that the battery is not depleted.

      OK: Battery is not depleted. 

    NG: REPLACE BATTERY 

    OK: Go to Next Step 

  13. CHECK BATTERY TERMINAL 
    1. Check that the battery terminals are not loose or corroded.

      OK: Battery terminals are not loose or corroded. 

    NG: REPAIR OR REPLACE BATTERY TERMINAL 

    OK: Go to Next Step 

  14. CHECK HARNESS AND CONNECTOR (PNP SWITCH OR CLUTCH START SWITCH - ST RELAY) 
    Fig 11: Identifying Harness And Connector (PNP Switch Or Clutch Start Switch - ST Relay)
    G04828358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ST relay from the engine room relay block.
    2. Disconnect the C27 PNP switch connector (A/T).
    3. Disconnect the A16 clutch start switch connector (M/T).
    4. Check the resistance.

      Standard resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (C27-5) - ST relay (2) Below 1 Ω
      L (A16-1) - ST relay (2)
      ST relay (1) - Body ground

      Standard resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      L (C27-5) or ST relay (2) - Body ground 10 kΩ or higher
      L (A16-1) or ST relay (2) - Body ground
    5. Reinstall the ST relay.
    6. Reconnect the PNP switch connector (A/T).
    7. Reconnect the clutch start switch connector (M/T).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPLACE STARTER RELAY AND STARTER 

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