I have a Toyota 8FD-30 with fault code AD-8. The ECU-B fuse blows after approximately 10min of use. The machine were at the dealers that changed the ECU and the junction box beneath the left step. The problem still persists.
I have traced the black wire from the fusebox to the buzzer and the ECU. I have disconnected and removed the buzzer but the problem is still the same. The black wire supply onlu the ECU and the buzzer with power.