I’ve spent the last few evenings troubleshooting the battery draining issues on my 2006 Camry. I discovered that cylinder # 1 fuel injector was causing a high current draw. When the battery is connected the current would spike close to 4A.

When the fuel injector is disconnected from the harness control signal the current drops down dramatically.

I’ll do more testing tomorrow night using a common test light or a noid test light (which I don’t currently own).