P3109

DTC P3109 Brake ECU Communication Circuit Malfunction

CIRCUIT DESCRIPTION
The HV ECU performs multiple checks to avoid any malfunction that may occur through the communication with the brake ECU due to a noise, etc.

HINT:
- When using an OBD II scan tool other than TOYOTA hand-held tester, check all the steps.
- When using TOYOTA hand-held tester, confirm the information code and check it.

Detecting Condition:

Wiring Diagram:

Step 1:

INSPECTION PROCEDURE

CIRCUIT DESCRIPTION

Detecting Condition:

INSPECTION PROCEDURE
If the information code 222 is output, after confirming the DTC of the brake ECU, check and repair the applicable DTC. Prior to repairing it, record the DTC of the HV ECU, freeze frame data and history of operation. Then, clear the DTC and check it one more time after starting the system again ("READY" light ON).