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Home >> Toyota >> 2009 >> Yaris Base, 4D Hatchback >> 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.

      OK 

      IGNITION SWITCH POSITION 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. Measure the voltage between the terminals of the ECM connector and body ground while cranking the engine.

      Standard voltage 

      VOLTAGE SPECIFICATION

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

      Result 

      RESULT REFERENCE

      Result Proceed To
      Within standard range(A/T) A
      Within standard range (M/T) B
      Outside standard range C
      Fig 1: Identifying A21 ECM Connector Terminal
      G04828348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Measure the voltage between the terminals of the PNP switch connector and body ground while cranking the engine.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connections Specified Conditions
      B (C27-4) - Body ground 11 to 14 V
      Fig 2: Identifying C27 Park/Neutral Position (PNP) Switch Connector
      G04828349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Check the resistance between each terminal shown below when the shift lever is moved to each range.

      Standard resistance 

      RESISTANCE REFERENCE

      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.
      Fig 3: Identifying C27 PNP Switch Connector Terminal
      G04828203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE PARK/NEUTRAL POSITION SWITCH  (See ON-VEHICLE INSPECTION )

      OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM) 
    1. Disconnect the C27 PNP switch connector.
    2. Disconnect the A21 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      RESISTANCE REFERENCE

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

      Standard resistance (Check for short) 

      RESISTANCE REFERENCE

      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 

      Fig 4: Identifying C27 PNP Switch Connector Terminal And A21 ECM Connector Terminal
      G04828351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM (See  REMOVAL   ) 

  6. INSPECT ECM (STAR VOLTAGE) 
    1. Disconnect the A16 clutch start switch connector.
    2. Measure the voltage between the terminals of the clutch start switch connector and body ground while cranking the engine.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connections Specified Conditions
      B (A16-2) - Body ground 11 to 14 V
      Fig 5: Identifying A16 Clutch Start Switch Connector Terminal
      G04828352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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. Check the resistance between the terminals of the clutch start switch.

      Standard resistance 

      RESISTANCE REFERENCE

      Switch Positions Specified Conditions
      Pushed in Below 1 Ω
      Released 10 kΩ or higher
    3. Reconnect the clutch start switch connector.
      Fig 6: Identifying A16 Clutch Start Switch Connector Terminal
      G05590776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE CLUTCH START SWITCH  (See REMOVAL )

      OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM) 
    1. Disconnect the A16 clutch start switch connector.
    2. Disconnect the A21 ECM connector.
    3. Check the resistance.

      Standard resistance (Check for open) 

      RESISTANCE REFERENCE

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

      Standard resistance (Check for short) 

      RESISTANCE REFERENCE

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

      Fig 7: Identifying A16 Clutch Start Switch Connector And A21 ECM Connector Terminal
      G04828354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM (See  REMOVAL   ) 

  9. INSPECT IGNITION SWITCH 
    1. Disconnect the D8 ignition switch connector.
    2. Check the resistance between the terminals shown below.

      Standard resistance 

      RESISTANCE REFERENCE

      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 )

      Fig 8: Identifying D8 Ignition Switch Connector Terminal
      G04828355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  10. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - PARK/NEUTRAL POSITION SWITCH - ECM) 
    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) 

      RESISTANCE REFERENCE

      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) 

      RESISTANCE REFERENCE

      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 

      Fig 9: Identifying D8 Ignition Switch Connector Terminal And C27 PNP Switch Connector Terminal
      G04828356Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM (See  REMOVAL   ) 

  11. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CLUTCH START SWITCH - ECM) 
    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) 

      RESISTANCE REFERENCE

      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) 

      RESISTANCE REFERENCE

      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 

      Fig 10: Identifying A16 Clutch Start Switch Connector Terminal And D8 Ignition Switch Connector Terminal
      G04828357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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) 
    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) 

      RESISTANCE REFERENCE

      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) 

      RESISTANCE REFERENCE

      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 

      Fig 11: Identifying C27 PNP Switch Connector (A/T)
      G04828358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: CHECK AND REPLACE STARTER RELAY AND STARTER 

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