•  The PCM operates metering oil pumps No.1 and No.2 by operating the metering oil pump driver according to the engine operation conditions.

•  The metering oil pump driver receives drive signals from the PCM to switch the internal ground and supply battery voltage to metering oil pumps No.1 and No.2.

•  The PCM determines the engine operation conditions based on the signals from the input parts and controls the metering oil pump driver at the optimal timing to operate the metering oil pump. For the construction/operation of metering oil pumps No.1 and No.2, refer to “LUBRICATION SYSTEM, METERING OIL PUMP, CONSTRUCTION/OPERATION. (See METERING OIL PUMP CONTROL OPERATION [13B-MSP].)