QuestionI have a 94 Camry 4 cyl.
At high speed the car feel very light and seem to be very sensitive to road imperfection or side wind.
The car was recently align, has new tires (4), new front springs, new shock absorbers (4).
The power steering pump has two vacuum hoses (seem to control the pressure output of the pump?). The solenoid valve controlling the vacuum to the oil pressure controller does not have any electrical power even when the vehicle is on the highway.
Questions:
How is the solenoid valve control?
Where is the sensor controlling the valves?
What vacuum the two hoses should be operating at?
Where can I find a vacuum hose diagram?
The solenoid valve seem to serve the power steering and other equipment?
AnswerThe two vaccum hoses are connected to a pressure sensor on the bottom of the power steering pump and to the intake manifold plenum chamber, when turning the steering wheel the pressure sensor lets more air pass through the valve and this increases the idle speed, this keeps the engine from stalling when the extra load from the power steering pump is applied, that's all it does, it increases the idle speed.
Some Camrys had a hydraulic operated cooling fan on the radiator, I believe this is the case from what I can get out of your description, the solenoid on top of the power steering pump controls how much pressure the fan gets and so regulates the fan speed, there is an input signal from a temp sensor, the computer then sends a variable electrical voltage to the solenoid to regulate the oil pressure and in turn the fan speed.
The temp sensor for the ecu is located near the thermostat housing, it has a green connector.
