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METERING OIL PUMP CONTROL BLOCK DIAGRAM
• 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).
ECT SENSOR
IAT SENSOR
BARO SENSOR
ECCENTRIC SHAFT POSITION
SENSOR
METERING OIL PUMP SWITCH
IGNITION SWITCH
End Of Sie
METERING OIL PUMP CONTROL OPERATION
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
Step number
0
Coil No.1
On
(PCM terminal 2W)
Coil No.2
Off
(PCM terminal 2AB)
Coil No.3
Off
(PCM terminal 2V)
Coil No.4
On
(PCM terminal 2Y)
• 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.
01–40–32
CONTROL SYSTEM
PCM
1
2
3
4
On
Off
Off
On
On
On
Off
Off
Off
On
On
Off
Off
Off
On
On
STEPPING MOTOR
(IN METERING OIL PUMP)
On: Energization, Off: Non-energization
5
6
7
8
On
Off
Off
On
On
On
Off
Off
Off
On
On
Off
Off
Off
On
On
CHU014000140S37
CHU0140S027
CHU014000140S38
9
10
30
52
On
Off
Off
On
On
On
On
Off
Off
On
On
Off
Off
Off
Off
On
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