I tired to hook up the high idle over the weekend with no luck. The cruise control hasn't worked since I bought the truck about 9 mos ago. I'm basically looking for some reassurance that I'm thinking right. Both these systems use the same switches as far as brake pressure, brake pedal, clutch pedal with high idle also using parking brake right? What would be the prime suspect. Does anything other than these two systems use the clutch pedal switch. My brake lights work and I assume the brake pedal switch activates those and would therefore not be the problem. That leaves the brake pressure and clutch pedal switches. Is there any other systems that look at the brake pressure and clutch pedal that I could narrow it down from that would be asily checkable. Feel free to correct me anywhere that I sound out of bounds on my reasoning.
Eric

 

You can test the clutch pedal switch by seeing if the truck will start without depressing the clutch. If it won't, then the clutch pedal switch is working.

The most likely culprit is the brake pedal switch. It is a double pole switch. One pole activates the brake lights, the other pole sends a signal to the PCM to do things like shut down high idle and disengage the cruise control. So it is possible that the brake light side is working while the PCM side is not.

As far as I know, the brake pressure switch is only a backup to shut down the cruise control if the brake pedal switch fails.

 

Keep in mind that the brake pedal switch has several sets of contacts in it. You could easily have brake lights, but still have a bad switch.

Also, since you have a manual tranny, using the high idle is a little different. If you used the SEIC version, a resistor is required or it just won't work. I'm not sure about the BCP version.

So keep in mind that the issues might be unrelated.

 

Any idea on the rating of the resistor. I remember reading that on the tech article now but didn't think about it when I tried to hook it up. I was hoping I might have killed two birds with one stone as far as my cruise not working as well. I can't remember a type/size resistor being specified in anything I read. I'll still take a look at the switch on the pedal. As far as the master cylinder switch I know those were recalled on the gas trucks. If I change that does it require a brake bleed or is the MC still sealed with the pressure switch removed.
e

 

I'm don't know what it takes on your '02. But I know that at the top of this document - High Idle Mod it says in a red line that it doesn't work on manual transmissions. On '05 and later, it works but a resistor or pot is required. I suspect something similar might be necessary on yours, but I don't have any info.

You probably should drop down to the 7.3 diesel engine section and ask your question there. I would think those guys have faced this issue before.

Oops, I just noticed your profile says 2002 Explorer. I guess it would help if we knew what year and what engine Superduty you have now.

 

Sorry 'bout that. I've got an '06 PSD.

 

Okay, sorry, forget everything I said above. I thought we were dealing with an '02.

Make sure you are using this document:
TheDieselStop.Com - www.thedieselstop.com

and this Ford document:
https://www.fleet.ford.com/truckbbas/non-html/Q108.pdf

I recommend you just go with the BCP circuit. It's easier, but that document will note the resistor chart that I mentioned above if you go with SEIC.

But at this point I agree with you, it's probably related to the non-op cruise control. Get that fixed first.

 

Thanks a lot. This place is like having your own service dept.
E

 

I'm going to guess it's your CPP (clutch pedal position) sensor. Pull it off the pedal rod and have a look inside. There should be one long spring on each side of where the rod sits. If it looks like several springs stacked on top of each other, then it's bad.

Here's how bad my springs looked


Around $30 at autozone and I had a new CPP.