Outline
The oil pump has a mechanism for feedback control of oil pressure. As a result, an oil pressure increase of more than the set pressure is suppressed and oil pump drive resistance is reduced. In addition, because the set pressure can be changed (oil pressure two-step control) by operating the engine oil solenoid valve, the oil pump drive resistance is reduced even during low speed/low to medium loads.
Purpose, Function
The oil pump suctions the engine oil in the oil pan through the oil strainer and pumps engine oil into the engine.
Construction
The oil pump is installed on the lower part of the cylinder block (in oil pan).
With the adoption of the chain drive type oil pump, the diameter of the rotor is reduced. As a result, the oil pump drive resistance has been reduced.
The oil pump consists of the following parts:
The relief valve and bypass valve is pushed and opened if oil pressure increases excessively when starting an extremely cold engine. As a result, the engine oil flows and excessive oil pressure increase is suppressed.
When the relief valve is pushed and opened, engine oil flows. As a result, the oil pressure decreases and the oil pump drive resistance is reduced.
Operation
The oil pump adjusts oil pressure in two steps (low oil pressure setting, high oil pressure setting) by switching the oil passage with the operation of the engine oil solenoid valve. For the operation condition of the engine oil solenoid valve, refer to CONTROL SYSTEM..
When the engine oil solenoid valve is turned ON, oil pressure is also applied to the upper part of the pilot valve. Because the oil pressure applied to the upper and lower parts of the pilot valve is almost same, the pilot valve is pressed up by the spring force.
Oil pressure is applied to the upper part of the relief valve.
When oil pressure exceeds the relief valve opening pressure, the relief valve is pressed down and engine oil flows. (oil pressure decrease)
When oil pressure is less than the relief valve opening pressure, the relief valve closes. As a result, engine oil flowing stops (oil pressure increase).
Oil pressure is adjusted by repeating Step (c) to (d).
When oil pressure exceeds the pilot valve opening pressure, the pilot valve is pressed up and oil pressure is applied to the upper part of the relief valve.
Because the relief valve opening pressure is exceeded by applying oil pressure to the upper part of the relief valve, the relief valve is pressed down and engine oil flows (oil pressure decrease).
When oil pressure is less than the pilot valve opening pressure, the pilot valve closes. As a result, the relief valve closes and engine oil flow stops (oil pressure increase).
Oil pressure is adjusted by repeating Step (b) to (c).
Center Roof Antenna
Purpose, Function
Converts radio broadcast waves to electric signals and sends the signals
to the audio unit.
Construction
A center roof antenna has been adopted which does not require retraction
or removal before going through an automatic car wash machine.
The ...
Gear Position Indicator [Fw6 A EL, Fw6 Ax EL]
Purpose/Function
The gear position indicator illuminates while under manual shift control
and displays the gear number while driving.
Construction
The gear position indicator is built into the instrument cluster.
Operation
The TCM sends a gear position indic ...
Refrigerant Line Removal/Installation
1. Disconnect the negative battery cable..
2. Discharge the refrigerant..
3. Disconnect the engine ground.
4. Disconnect the refrigerant pressure sensor connector.
5. Remove in the order indicated in the table. Do not allow compressor oil to
spill.
CAUTION:
If moisture or for ...