A vehicle electronic control system has a control CPU and a monitor CPU. The
control
CPU performs a fail-safe processing thereby to reduce an engine output torque,
when the monitor CPU monitoring the control CPU detects that the control CPU fails
to perform throttle control for an engine. When the monitor CPU detects that the
control CPU fails to perform the fail-safe processing, it performs a fail-safe
processing in place of the control CPU. In this fail-safe processing, the monitor
CPU continues to reset the control CPU so that the engine may be forcibly stopped.
