Description of On-Board Diagnostics

DIAGNOSIS SYSTEM




a. Description
- The HV Battery ECU has a self-diagnosis system by which malfunction in the computer itself or in Hybrid System is detected and the master warning light in the combination meter and the Hybrid system warning light in the multi-information display lights up.




- To check the Diagnostic Trouble Codes (DTC), connect the TOYOTA hand-held tester to the Data Link Connector 3 (DLC3) on the vehicle. The TOYOTA hand-held tester also enables you to erase the DTC and check freeze frame data and various forms of THS data.

- Freeze frame data:
Freeze frame data records the battery condition when a malfunction is detected.
When troubleshooting, this is useful for knowing the battery condition

b. Check the DLC3.




The HV control ECU conforms to ISO 14230 for communication.
The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 14230 format.

HINT: If your display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the TOYOTA hand-held tester to the DLC3, turned the motor switch ON and operated the tester, there is a problem in the vehicle or tool.
- If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department.