ENGINE IMMOBILISER SYSTEM Power Source Circuit

DESCRIPTION

This circuit provides power to operate the transponder key ECU.

WIRING DIAGRAM

A01J6AEE03

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ECU-B, DCC, IGN)


    1. Remove the ECU-B and DCC fuses from the engine room relay block.

    2. Remove the IGN fuse from the instrument panel junction block.

    3. Measure the resistance of the fuses.

      Standard resistance
      Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. INSPECT IGNITION SWITCH ASSEMBLY

    A01J4EDE02

    1. Remove the ignition switch.

    2. Measure the resistance of the switch.

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      5 (AM2) - 6 (IG2) LOCK, ACC 10 kΩor higher
      ON, START Below 1 Ω

    NG

    REPLACE IGNITION SWITCH ASSEMBLY

    OK

  3. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND)

    A01J3T1E01

    1. Disconnect the T21 ECU connector.

    2. Measure the resistance and voltage of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      T21-16 (GND) - Body ground Always Below 1 Ω
      Standard voltage
      Tester Connection Condition Specified Condition
      T21-1 (+B) - Body ground Always 10 to 14 V
      T21-2 (IG) - Body ground Ignition switch OFF Below 1 V
      Ignition switch ON 10 to 14 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE TRANSPONDER KEY ECU