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IC.4.1.1 The electronic throttle must automatically close (return to idle) when power is removed.
IC.4.1.2 The electronic throttle must use minimum two sources of energy capable of returning the throttle to the idle position.
a. One of the sources may be the device (such as a DC motor) that normally actuates the throttle
b. The other device(s) must be a throttle return spring that can return the throttle to the idle position if loss of actuator power occurs.
c. Springs in the TPS are not acceptable throttle return springs
IC.4.1.3 The ETC system may blip the throttle during downshifts when proven that unintended acceleration can be avoided. The functional analysis must be documented in the FMEA.