RE: P0551

From: Rick Barnes (rascal@scrtc.com)
Date: Sun Apr 16 2006 - 13:35:15 EDT


Thanks Bill, I never heard of that.

Rascal

-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bill Pitz
Sent: Sunday, April 16, 2006 11:43 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: P0551

Rick Barnes wrote:
> Where the heck is that switch?

It sits in the high pressure line right next to the P/S pump. As far as
I know, it's only present on the 2.5L and 4.7L engines.

The purpose of the switch is to send a signal to the PCM to increase
idle RPM when the engine is running at low speeds and there is heavy
load on the P/S (i.e. parking). The boost in idle RPM is supposed to
keep the engine from stalling.

-Bill
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