THEFT DETERRENT SYSTEM Starter Relay Circuit

DESCRIPTION

When the theft deterrent system operates, the theft warning ECU assembly deactivates the ST relay so that the starter cannot crank the engine.

WIRING DIAGRAM

A01DVT2E07

INSPECTION PROCEDURE

Note


  • If the engine cranks but does not start, there is a problem with the SFI system*1 or ECD system*2. If this is the case, refer to SFI System*1 or ECD System*2 and perform troubleshooting.


    • *1: for 2TR-FE

    • *2: for 1KD-FTV, 2KD-FTV

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When replacing the theft warning ECU assembly, refer to the registration procedures Click here.

PROCEDURE


  1. INSPECT ST RELAY


    1. A01DY34E02
      Text in Illustration
      *A for 2TR-FE
      *B for 1KD-FTV, 2KD-FTV

      Remove the ST relay from the engine room relay block and junction block assembly.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ST RELAY

    OK

  2. INSPECT IGNITION SWITCH ASSEMBLY


    1. A01E0PLE02

      Remove the ignition switch assembly.


    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (AM2) - 7 (ST2) Off, ACC, ON 10 kΩ or higher
      Start Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for 2TR-FE) B
      NG (for 1KD-FTV) C
      NG (for 2KD-FTV) D

    B

    REPLACE IGNITION SWITCH ASSEMBLY Click here

    C

    REPLACE IGNITION SWITCH ASSEMBLY Click here

    D

    REPLACE IGNITION SWITCH ASSEMBLY Click here

    A

  3. CHECK VEHICLE TYPE


    1. Check the vehicle type.

      Result
      Result Proceed to
      for Automatic Transmission A
      for Manual Transmission B

    B

    CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY) Click here

    A

  4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. A01E17Y

      Remove the park/neutral position switch assembly.


    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      4 - 5 Shift lever in P or N Below 1 Ω
      Shift lever not in P and N 10 kΩ or higher

      Tech Tips

      If replacing the park/neutral position switch assembly, refer to the procedures above.


    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY)


    1. A01DZ6AE01
      Text in Illustration
      *A for 2TR-FE
      *B for 1KD-FTV, 2KD-FTV
      *a

      Front view of wire harness connector

      (to ST Relay)

      Remove the ST relay from the engine room relay block.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for 2TR-FE
      Tester Connection Condition Specified Condition
      Relay block ST relay terminal 3 - Body ground Always 11 to 14 V
      for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Specified Condition
      Relay block ST relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU - BATTERY AND BODY GROUND)


    1. A01E085E08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Theft Warning ECU Assembly)

      Disconnect the T36 theft warning ECU assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      T36-1 (E) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T36-12 (SRLY) - Body ground Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE THEFT WARNING ECU ASSEMBLY