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Diagnosis System

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  1. DESCRIPTION 
    1. The HV control ECU has a self-diagnosis system. If the computer, hybrid vehicle control system or the components are not working properly, the ECU carries out a diagnosis to detect the malfunction, and illuminates the master warning light in the combination meter together with any of the indicators on the multi-information display, the HV system warning, the HV battery warning or the discharge warning.
      Fig 1: Identifying Combination Meter (Multi-Information Display)
      G05201203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The master warning light illuminates when THS II fails and it blinks when in inspection mode.

      • When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you need to connect the OBD II scan tool complying with SAE J1978 or the intelligent tester to the vehicle, and read various data output from the vehicle's ECUs.
      • OBD II regulations require that the vehicle's on-board computer illuminates the Malfunction Indicator light (MIL) in the instrument panel when the computer detects a malfunction in: 1) the emission control systems/ components, 2) the powertrain control components (which affect vehicle emissions), or 3) the computers. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the HV control ECU memory (See DIAGNOSTIC TROUBLE CODE CHART ).

      If the malfunction does not recur in 3 consecutive trips, the MIL will go off automatically. However the DTCs remain recorded in the HV control ECU memory.

      • To check the DTCs, connect the intelligent tester to the Data Link Connector 3 (DLC3) with the CAN vehicle interface module (CAN VIM). The intelligent tester also allows erasing of the DTCs and check the freeze frame data and various forms of THS II data (for operating instructions, refer to their respective instruction service information). The DTCs include SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set as prescribed by the SAE, while manufacturer controlled codes can be set by the manufacturer within the prescribed limits (See DIAGNOSTIC TROUBLE CODE CHART ).
  2. CHECK DLC3 
    1. The HV control ECU uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
      Fig 2: Connecting Intelligent Tester To Data Link Connector 3
      G05242064Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Identifying Data Link Connector 3 (DLC3) Terminals
      G05201205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      DLC3 TERMINALS REFERENCE CHART

      Symbol Terminal No. Name Reference Terminal Result Condition
      SIL 7 Bus "+" line 5 - Signal ground Pulse generation Always
      CG 4 Chassis ground Body ground 1 Ω or less Always
      SG 5 Signal ground Body ground 1 Ω or less Always
      BATT 16 Battery positive Body ground 11 to 14 V Ignition switch OFF
      CANH 6 HIGH-level CAN bus line 14-LOW-level CAN bus line 54 to 69 Ω Ignition switch OFF
      CANH 6 HIGH-level CAN bus line 14 - Battery positive 1 MΩ or higher Ignition switch OFF
      CANH 6 HIGH-level CAN bus line 4 - Chassis ground 1 kΩ or higher Ignition switch OFF
      CANL 14 LOW-level CAN bus line 16-Battery positive 1 MΩ or higher Ignition switch OFF
      CANL 14 LOW-level CAN bus line 4 - Chassis ground 1 kΩ or higher Ignition switch OFF

      HINT:

      If the display shows a communication error message when you have connected the cable of the intelligent tester to the DLC3, turned the ignition switch to the ON position and operated the tester, there is a problem on the vehicle side or tester side.

      • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in its instruction service information.
  3. INSPECT AUXILIARY BATTERY 
    1. Measure the voltage of the auxiliary battery.

      Standard Voltage: 

      10 to 14 V 

    2. Inspect the auxiliary battery, fuses, fusible links, wiring harness, connectors and ground.
  4. CHECK MIL 
    1. The MIL illuminates when the ignition switch is turned to the ON position and the "READY" light is off.

      If the MIL is not illuminated, troubleshoot the MIL CIRCUIT .

    2. When the "READY" light turns on, the MIL should turn off. If the MIL remains on, the diagnosis system has detected a malfunction or abnormality in the system.
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