HYBRID CONTROL SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION


    1. The power management control ECU has a self-diagnosis system. If the computer, hybrid control system, or a component is not working properly, the ECU records the conditions that relate to the fault. The ECU also illuminates the hybrid system warning light in the combination meter assembly.

      A01UYB2E01
      Text in Illustration
      *1 READY Indicator Light *2 Hybrid System Overheat Warning Light
      *3 Hybrid System Warning Light *4 MIL
      *5 Auxiliary Battery Charging Warning Light - -

      Tech Tips

      The hybrid system warning light will illuminate when the hybrid control system malfunctions and the light will blink when in inspection mode.

    2. Description for Euro-OBD (European spec.)


      • When troubleshooting Euro-OBD vehicles, the only difference from the usual troubleshooting procedure is that you need to connect the OBD scan tool complying with ISO 15031-4 or the GTS to the vehicle, and read various data output from the vehicle's ECUs.

      • Euro-OBD regulations require that the vehicle's on-board computer illuminates the MIL in the instrument panel when the computer detects malfunction in: 1) the emission control systems/components, or 2) the powertrain control components (which affect vehicle emissions), or 3) the computers. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by ISO 15031-4 are recorded in the power management control ECU memory Click here.

      • To check the DTCs, connect the GTS or OBD scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The GTS or OBD scan tool also enables you to erase the DTCs and check the freeze frame data and various forms of the HV battery systems data (for operating instructions, refer to their respective instruction manuals). The DTCs include ISO controlled codes and manufacturer controlled codes. ISO controlled codes must be set as prescribed by the ISO, while manufacturer controlled codes can be set by a manufacturer within the prescribed limits Click here.

      • Freeze frame data:

        The freeze frame data records the driving condition when malfunction is detected. When troubleshooting, it can help determine if the vehicle was running, braked, stopped, or reversed.

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

  2. 2 TRIP DETECTION LOGIC


    • When a malfunction is first detected, the malfunction is temporarily stored in the power management control ECU memory (1st trip). If the same malfunction is detected during the next drive cycle, the MIL is illuminated (2nd trip).

  3. FREEZE FRAME DATA


    • The power management control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

  4. AUXILIARY BATTERY VOLTAGE


    • If voltage is below 11 V, replace or recharge the auxiliary battery.

      Note

      After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

  5. MIL (Malfunction Indicator Lamp)


    1. The MIL is illuminated when the ignition switch is first turned ON (IG), before the READY indicator comes on.

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

      Tech Tips

      If the MIL is not illuminated when the ignition switch is first turned ON (IG), check the MIL circuit Click here.