2012 Toyota Lexus IS300 won’t start normally

Last week, a friend called me that his Toyota Lexus IS300 would not start normally and then took it into my shop. If I was not mistaken, his Lexus was bought just two years ago. It was unusual for a two-year-old vehicle to have engine damage.

When he took the vehicle to my shop, I first unlock the car with remote, and it could be opened smoothly. Then I pressed the start button, the steering wheel would move, but the vehicle would not start, so as the dashboard. My first guess was its battery was lack of electricity.

I connected the car with Jump Start Emergency Charger and tried to start it again, the car still did not work. When I pressed the brake pad, the start button turned to green from amber. This meant it had detected the car key and had received authorization from ECU. Then I tried to relieve the anti-theft system. Then I tried to troubleshoot its ECU by using XHORSE MVCI. The system could be relieved easily, while the dashboard only illuminated for a while and then died. I tried to restart it again, but the engine just did not work, and therefore I could not use a car diagnostic tool.

The phenomena meant the car engine could not switch to 1G – 0N model. I then got down inspecting its fuses, relay, engine switch, engine control units, engine control module according to its circuit diagram. An hour later, I found a cable in power supply control was damaged.

After I replaced the damaged ECU, the vehicle could be started smoothly.

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