CONTROL SYSTEM
01–40–32
METERING OIL PUMP CONTROL BLOCK DIAGRAM
CHU014000140S37
• The PCM calculates the optimum amount of oil delivery (stepping motor step number) by determining the
engine operation conditions based on each input signal, and sends an operation signal to the stepping motor
(inside the metering oil pump).
End Of Sie
METERING OIL PUMP CONTROL OPERATION
CHU014000140S38
Outline
• The PCM changes the amount of stroke of the plunger by controlling the amount of stepping motor rotation
(step number), adjusting the amount of oil delivery.
• The stepping motor operates by the combination of coils No.1—No.4, according to the stepping motor step
number.
Example of energization condition for each coil and step number
On: Energization, Off: Non-energization
• The energization condition of stepping motor coils No.1—No.4 can be verified by verifying the step number
based on the WDS data monitor function PID (MOP POS).
Energization Off Function
• When the ignition switch is turned to the ON position and the engine is stopped, current flow to stepping motor
coils No.1—No.4 is stopped, saving on battery consumption.
PCM
ECT SENSOR
IAT SENSOR
STEPPING MOTOR
(IN METERING OIL PUMP)
ECCENTRIC SHAFT POSITION
SENSOR
METERING OIL PUMP SWITCH
IGNITION SWITCH
BARO SENSOR
CHU0140S027
Step number 0123456789103052
Coil No.1
(PCM terminal 2W)
On On Off Off On On Off Off On On Off Off On
Coil No.2
(PCM terminal 2AB)
OffOnOnOffOffOnOnOffOffOnOnOnOff
Coil No.3
(PCM terminal 2V)
Off Off On On Off Off On On Off Off On On Off
Coil No.4
(PCM terminal 2Y)
On Off Off On On Off Off On On Off Off Off On
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