An
internal combustion engine automatic start-stop
control unit for executing an
internal combustion engine idle reduction control that automatically stops an
internal combustion engine when a predetermined automatic stop condition is met and restarts the internal
combustion engine by driving a
starter (18, 28) when a predetermined restart condition is met, the internal
combustion engine automatic start-stop
control unit comprising: - an
idle reduction control
microcomputer (14, 46) which controls a
starter relay (17, 31, 32) to control an
electric current supplied to the
starter (18, 28); and - a monitoring circuit (13, 45) which monitors an operation of the
idle reduction control
microcomputer (14, 46) via a first
signal line (22) and a second
signal line (23), wherein - the idle reduction control
microcomputer (14) and the monitoring circuit are integrated in a single
electronic control unit (15), and characterized in that - the monitoring circuit (13, 45), when it detects an
abnormality of the idle reduction control microcomputer (14, 46), switches off the starter
relay (17, 31, 32) to prevent activation of the starter (18, 28) and resets the idle reduction control microcomputer (14, 46).