HYBRID BATTERY SYSTEM DIAGNOSIS SYSTEM

1. The hybrid vehicle control ECU has a self-diagnosis system. If the computer, hybrid vehicle control system, or a component is not working properly, the ECU records the conditions that relate to the fault. The ECU also illuminates the master warning light in the combination meter and provides other appropriate messages on the multi-information display, such as the HV system warning message, the HV battery warning message, or the discharge warning message.

   

   Tech Tips

   The master warning light will illuminate when the THS II 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 intelligent tester 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 hybrid vehicle control ECU memory Click here.

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

   • To check the DTCs, connect the intelligent tester or OBD scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The intelligent tester or OBD scan tool also enables you to erase the DTCs and check the freeze frame data and various forms of the HV battery system 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 hybrid vehicle control ECU memory.