5th Generation Maxima (2000-2003) Learn more about the 5th Generation Maxima, including the VQ30DE-K and VQ35DE engines.

Is this part the refrigerant pressure sensor?

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Old May 20, 2016 | 03:15 PM
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Is this part the refrigerant pressure sensor?

The wires are still attached but it seems like it was busted off when working on the strut mounting bolts. The manual says the RPS is located near the condenser but the drawings show a similar location as this one. Presumably this cannot be replaced without evacuating the AC lines. For now I will probably just glue it in place since everything appears to still be working fine. Thanks in advance.

Old May 20, 2016 | 03:27 PM
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That's power steering. Snag a freebie at the junkyard.
Old May 20, 2016 | 06:09 PM
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Thanks. Would never have guessed that part but after looking it up in the ESM it definitely is that part. Strange they make no mention of it in the power steering section, only in the electrical connectors sections. It does say that it is connected to the high pressure side of the power steering fluid. Presumably this is only under pressure when the engine is running powering the pump - correct? If not, is there anyway to release the pressure in the system? For now I'm just going to glue the connector as the wires are still working properly but if I end up replacing it, I would like to know what I am getting myself into.
Old May 20, 2016 | 06:15 PM
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Originally Posted by ajahearn
Thanks. Would never have guessed that part but after looking it up in the ESM it definitely is that part. Strange they make no mention of it in the power steering section, only in the electrical connectors sections. It does say that it is connected to the high pressure side of the power steering fluid. Presumably this is only under pressure when the engine is running powering the pump - correct? If not, is there anyway to release the pressure in the system? For now I'm just going to glue the connector as the wires are still working properly but if I end up replacing it, I would like to know what I am getting myself into.
Correct, there is no pressure when the engine is off.
Old May 20, 2016 | 08:29 PM
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that sensor is used by the ECU to keep the engine idle speed from dropping when you turn the steering wheel. Other than you will see the idle speed drop maybe 50 rpm, you don't really need it.
Old May 20, 2016 | 10:19 PM
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Originally Posted by DennisMik
that sensor is used by the ECU to keep the engine idle speed from dropping when you turn the steering wheel. Other than you will see the idle speed drop maybe 50 rpm, you don't really need it.
Interesting.
I just realized that I don't understand how the PS pump controls the pressure of the PS fluid. I have assumed (perhaps naively) that the pressure varies depending on vehicle speed and perhaps other factors. However, having skimmed the ST section of the FSM, I couldn't find a feedback loop or any other control loop. Does this mean that the pressure simply grows with RPMs? Or perhaps does not grow, and stays more or less constant?

This does not make sense to me, but perhaps I have it all wrong ..... Can somebody enlighten me?
Old May 21, 2016 | 07:26 PM
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Pressure is regulated by the pump itself, by a pressure relief spring or something. Increasing engine rpm does increase pressure, but only by a little bit. The main reason pressure increases is due to the additional resistance to the oil flow inside the steering gear when the steering wheel is turned.

The sensor the op is asking about is strictly for maintaining engine idle rpm. A bad sensor can cause a DTC & check engine light.
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