I've noticed my Toyota Camry 2010 (automatic transmission) delays gear upshift on high engine rev (> 4000 RPM). But on low rev (typically below 3000 RPM) gear upshift is timely. This wasn't case when I bought it (used).
This problem would usually drive my engine to more than 6000 RPM and sometimes without a gear up shift until I start to ease on the gas pedal (throttle). I ran a diagnosis via the OBD-II port and everything checked out fine.
I read somewhere on the internet that sometimes high current from the throttle can cause the shift solenoid to not function properly. But this didn't show on the scan.
Is there a way of testing the gas pedal (throttle) to know if it's giving out excess current?
Based on the problem described, might anyone suggest a possible solution or a way to find out the problem.