Power steering high pressure switch ? - JeepForum.com
 
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post #1 of 14 Old 12-17-2007, 09:27 PM Thread Starter
KenF
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Power steering high pressure switch ?

What is the purpose of the power steering high pressure switch on a 2.5

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post #2 of 14 Old 12-17-2007, 10:18 PM
ElvisV04290
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From my understanding the switch detects the load on the pump and tells the ECU to adjust the engine idle so the pump gets more power when under load.

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post #3 of 14 Old 12-17-2007, 10:46 PM
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Quote:
Originally Posted by ElvisV04290
From my understanding the switch detects the load on the pump and tells the ECU to adjust the engine idle so the pump gets more power when under load.
Really? I thought it was just to let the ECU know if there was something wrong with the pressure.

.
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post #4 of 14 Old 12-18-2007, 07:09 AM
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I went to change my ps pump and realized I don't have one.... is that a bad thing?

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post #5 of 14 Old 12-18-2007, 11:31 AM Thread Starter
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The OEM manual says they are only on the 2.5s.
It will send a signal to the ECU when this system is under higher load like turning against the lock when the motor is idleing.

But does not say why. It makes sense that it would bump the idle up on the smaller motor.
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post #6 of 14 Old 12-18-2007, 04:36 PM
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Got this from the Service Manual:

"A pressure sensing switch is included in the power
steering system (mounted on the high-pressure line).
This switch will be on vehicles equipped with a 2.5L
engine and power steering. The switch (figure 12, YJ
models or figure 13, XJ models) provides an input to
the PCM. This input is provided during periods of
high pump load and low engine rpm; such as during
parking maneuvers. The PCM will then increase the
idle speed through the idle air control (IAC) motor.
This is done to prevent the engine from stalling under
the increased load.

When steering pump pressure exceeds 1896 kPa +/-
172 kPa (275 +/- 25 psi) the PCM will increase the engine
idle speed. This will prevent the engine from
stalling."

Last edited by Desert Bob; 12-19-2007 at 05:12 PM.
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post #7 of 14 Old 12-18-2007, 05:56 PM
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Great information.
Quote:
Originally Posted by Desert Bob
Got this from the Service Manual:

"A pressure sensing switch is included in the power
steering system (mounted on the high-pressure line).
This switch will be on vehicles equipped with a 2.5L
engine and power steering. The switch (figure 12, YJ
models or figure 13, XJ models) provides an input to
the PCM. This input is provided during periods of
high pump load and low engine rpm; such as during
parking maneuvers. The PCM will then increase the
idle speed through the idle air control (IAC) motor.
This is done to prevent the engine from stalling under
the increased load.

When steering pump pressure exceeds 1896 kPa 6
172 kPa (275 6 25 psi) the PCM will increase the engine
idle speed. This will prevent the engine from
stalling."
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post #8 of 14 Old 12-18-2007, 08:56 PM
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And I just thought that the ECU sensed the lower RPMs and increased to compensate. Now I know why my rpms go up. I wish there was a sensor for when my Taurus fan kicks in.

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post #9 of 14 Old 12-10-2019, 10:42 PM
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Quote:
Originally Posted by Mr.B View Post
And I just thought that the ECU sensed the lower RPMs and increased to compensate. Now I know why my rpms go up. I wish there was a sensor for when my Taurus fan kicks in.
Is it safe to assume if the IAC doesnít kick up the idle that the power steering switch is bad? Or is this one of those pull the thread until youíve replaced everything on the heep?
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post #10 of 14 Old 12-11-2019, 08:27 AM
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Ya, start with new valve stem caps. Once you get those done and the comp-cut and SOA is complete- and it still isn’t working- replace the pressure switch. Or at least test it with a multimeter.

Quote:
Originally Posted by Mr.B View Post
And I just thought that the ECU sensed the lower RPMs and increased to compensate. Now I know why my rpms go up. I wish there was a sensor for when my Taurus fan kicks in.
My 89 -now a 4.0- has a ‘91 2.5 harness in it. The switch plug is still there. I’ve always wondered if it still worked (with the 4.0 ecu)

In your case, since the pressure switch only completes a circuit and sends a signal to the ecu, you could configure a standard 5-pin relay to tell the computer “the pressure has gone up” when the fan kicks in...

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #11 of 14 Old 12-11-2019, 06:56 PM
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Quote:
Originally Posted by fishadventure View Post
Ya, start with new valve stem caps. Once you get those done and the comp-cut and SOA is complete- and it still isnít working- replace the pressure switch. Or at least test it with a multimeter.



My 89 -now a 4.0- has a Ď91 2.5 harness in it. The switch plug is still there. Iíve always wondered if it still worked (with the 4.0 ecu)

In your case, since the pressure switch only completes a circuit and sends a signal to the ecu, you could configure a standard 5-pin relay to tell the computer ďthe pressure has gone upĒ when the fan kicks in...
Fish, unlike you to get sucked into a 12 year old thread

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post #12 of 14 Old 12-11-2019, 07:59 PM
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Quote:
Originally Posted by fishadventure View Post
Ya, start with new valve stem caps. Once you get those done and the comp-cut and SOA is complete- and it still isnít working- replace the pressure switch. Or at least test it with a multimeter.


I like that order of operations lol. Itís been bothering me since I got the Jeep earlier this year - the idle dropping whenever Iím pulling in the garage or cutting the wheel hard (and me thinking itís gonna stall).

Getting back home this weekend and Iíll try to test it.


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post #13 of 14 Old 12-11-2019, 08:34 PM
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Quote:
Originally Posted by fishadventure View Post
Ya, start with new valve stem caps. Once you get those done and the comp-cut and SOA is complete- and it still isnít working- replace the pressure switch. Or at least test it with a multimeter.


I like that order of operations lol. Itís been bothering me since I got the Jeep earlier this year - the idle dropping whenever Iím pulling in the garage or cutting the wheel hard (and me thinking itís gonna stall).

Getting back home this weekend and Iíll try to test it.


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post #14 of 14 Old 12-14-2019, 09:11 AM
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Quote:
Originally Posted by NHfireLJ View Post
unlike you to get sucked into a 12 year old thread
>sigh<

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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