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Really need to read up on how the Prius works. The power brakes have an electric vacuum pump. The power steering is electric. The heater has electric assist. The transmission has no neutral or reverse gears, just one planetary gear set with the engine/starter/generator on the sun gear, the wheels driven from the planet carrier and a 16 kW electric motor/generator on the ring gear. You have no mechanical connection to the throttle or the 'transmission'. If the Prius gas engine is running while at a light (only while warming up), the ring gear motor is turning backwards so that the wheels don't turn. To go 'reverse', the ring motor turns backwards and then even faster backwards if the gas engine starts. You are totally at the mercy of the computer that ties it all together. The 'ABS' does not 'pump' the brakes at any rate.They simply turn the brakes off for a half second and flash a light on the das that SHOULD say 'good luck'. If a wheel slips while accelerating (very easy to do in the rain especially if turning), the power is turned off for a half second. Both of these things are VERY disconcerting the first time it happens.
My little kids know what to do when a computer screws up. You turn it off and restart it. IF there is a bug in the Prius computer, how does testing it later tell you anything? It recorded what happened? But if the computer is misbehaving, is it recording what's happening?
Bottom line, most of what you know about how a car works does not apply to the Toyota hybrid system.
G=B2