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Diagnosis System

  1. DESCRIPTION 
    1. Diagnostic System

      When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle steering lock ECU (steering lock actuator assembly).

      The steering lock ECU (steering lock actuator assembly) records DTCs when the computer detects a malfunction in the computer itself or in its circuits.

      To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables the DTCs to be cleared, the indicators to be activated, and the Data List to be checked.

    2. The diagnosis information of the steering lock ECU (steering lock actuator assembly) is transmitted to the Techstream via the certification ECU (smart key ECU assembly) as the steering lock ECU (steering lock actuator assembly) is not connected to CAN.
    3. Check the DLC3.
      1. Check the DLC3 (See GENERAL INFORMATION ).
  2. WARNING FUNCTION OF ENGINE SWITCH INDICATOR 
    1. The steering lock ECU (steering lock actuator assembly) blinks the LED indicator of the engine switch when any of the following problems occurs in the system:

      Text in Illustration 

      ILLUSTRATION REFERENCE

      *1 Indicator Light
      Fig 1: Identifying Indicator Light
      G06026489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ILLUSTRATION REFERENCE

      Detection Item Indicator Light Blink Pattern Indication Status Countermeasure
      Steering lock is still not released
      • Blinks green at 1-second intervals
      • Goes off 30 seconds after blinking starts
      		 The motor operates to release the steering lock, but the steering lock cannot be released (e.g. the lock bar is stuck in the steering column). Push the engine switch while turning the steering wheel left or right.
      Malfunction in push-button start system
      • Blinks amber at 2-second intervals
      • Goes off 15 seconds after the engine switch is turned off while blinking
      • There is a short in the devices activating the motor.
      • There is a problem in the steering lock ECU (steering lock actuator assembly) or power management control ECU.
      		 Troubleshoot by following "How to Proceed with Troubleshooting" (See HOW TO PROCEED WITH TROUBLESHOOTING ).
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