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Diagnosis System

  1. CHECK DLC3 
    1. The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals (CANL And BAT)
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION SPECIFIED CONDITION REFERENCE CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      BAT (16) - Body ground Battery positive Always 10 to 14 V
      CANH (6) - CANL (14) CAN bus line Engine switch off(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Engine switch off(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Engine switch off(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Engine switch off(1) 6 kΩ or higher
      NOTE:
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors.

      If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    2. Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the engine switch on (IG) and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists in the vehicle side or tester side.

      HINT:

      • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
        Fig 2: Connecting Intelligent Tester To DLC3
        G05251340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. FUNCTION OF WARNING INDICATOR AND MESSAGE 
    1. If the pre-collision system is not functioning properly, the driver is warned by the master warning indicator and multi-information display warning message on the combination meter.
      Fig 3: Identifying Warning Indicator And Massage
      G05251344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      MASTER WARNING INDICATOR REFERENCE CHART

      Master Warning Indicator Warning Message Detail DTC PCS Warning indicator
      ON CHECK PCS SYSTEM This message appears when the seat belt control ECU detects a system malfunction ◦ ON
      ON PCS NOT AVAILABLE NOW This message appears when the seat belt control ECU is in the fail-safe mode (See INITIALIZATION  ) - Blinking
      ◦: DTC is output
      -: DTC is not output
    2. Initial check.
      1. The initial check occurs when the engine switch is off for more than 2 seconds, and then turned on (IG). The initial check consists of a pre-collision system diagnostic check with a duration of approximately 3 seconds.
      2. If a malfunction is detected during the initial check, the multi-information display will output "CHECK PCS SYSTEM" or "PCS NOT AVAILABLE NOW".
      Fig 4: Identifying PCS
      G05251345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Constant check.
      1. The seat belt control ECU and distance control ECU constantly monitor the pre-collision system for malfunctions after the initial check approximately 3 seconds after turning the engine switch on (IG).
      2. "CHECK PCS SYSTEM" or "PCS NOT AVAILABLE NOW" is displayed on the multi-information display in the combination meter assembly when the constant check detects malfunctions in the pre-collision system.
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