Cruise Control
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New User
Joined: Feb 2020
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From: Italy, Verona
Cruise Control
Hello everyone, we have a problem with an American E350 motorhome from 1995. We had the E4OD gearbox overhauled here in Italy and since then we have lost the functionality of cruise control.
Some reported us to be a problem related to the HR127 relay (which we also purchased) but unfortunately we are unable to find its position, indeed we are almost convinced that it is not present on our vehicle. We have checked all the fuses and relays, but even here we have not found anything unusual. Wandering on the web and mainly in this forum, we found a discussion of a gentleman with a Bronco who, following a total revision of the gearbox, also noticed the exclusion of cruise control, can you confirm this? Where can we possibly take action to solve the problem?
In addition, following the various wiring diagrams and checking with a tester, I noticed that I have continuity on the wiring that enters the ECM during turning on and off, but I don't have the actual activity. Could it be a problem with the ECM itself?
Some reported us to be a problem related to the HR127 relay (which we also purchased) but unfortunately we are unable to find its position, indeed we are almost convinced that it is not present on our vehicle. We have checked all the fuses and relays, but even here we have not found anything unusual. Wandering on the web and mainly in this forum, we found a discussion of a gentleman with a Bronco who, following a total revision of the gearbox, also noticed the exclusion of cruise control, can you confirm this? Where can we possibly take action to solve the problem?
In addition, following the various wiring diagrams and checking with a tester, I noticed that I have continuity on the wiring that enters the ECM during turning on and off, but I don't have the actual activity. Could it be a problem with the ECM itself?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
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From: SE Florida
With the 7.3L the entire cruise control, except for the switches, is just some programming in the PCM. Chances are that the PCM is not the problem. Usually, it is a problem with the brake pressure switch on the brake master cylinder, or the switches on the steering wheel, or the clock spring in the steering column.
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From: Italy, Verona
With the 7.3L the entire cruise control, except for the switches, is just some programming in the PCM. Chances are that the PCM is not the problem. Usually, it is a problem with the brake pressure switch on the brake master cylinder, or the switches on the steering wheel, or the clock spring in the steering column.
then the pressure switch on the master cylinder of the brake I have already replaced it and during the function test it works correctly.
I thought of PCM because in the past I have already had problems with this vehicle due to the humidity inside them, but if you tell me to check other things, I will do it willingly.
I do not think the switches on the steering wheel, because as I said a few days ago I examined the pins of the connector that enters the PCM and the impulse given by pressing the ON / OFF keys I detect it, but it does not come into effect in all respects.
What do you mean by the clock spring on the seat?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
The clock spring is inside the steering column. It is the device that connects the steering wheel switch to the wiring harness further down the column. But if you can see the switches working where they enter the PCM it is unlikely that this is the problem. If all of the inputs are working and the cruise is not, it very well could be the PCM.
Can you get Forscan where you are at? www,forscan.org. You'll also need an ELM327 adapter and a laptop. Then you can look at the PCM data and see if it is seeing the inputs.
Can you get Forscan where you are at? www,forscan.org. You'll also need an ELM327 adapter and a laptop. Then you can look at the PCM data and see if it is seeing the inputs.
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Unless the E series/Vans are set up different than the F250s/350s, it won't have the clock spring like that. The F series have a "race track", with 3 copper runs on it, type under the steering wheel, with 3 brushes to follow the runs on the track. I have seen the brush holder break, if the bearings go bad in the steering column. This effected the horn, but as I never use the cruise, I don't know if it had any effect on the cruise. I would think it would though.
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New User
Joined: Feb 2020
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From: Italy, Verona
The clock spring is inside the steering column. It is the device that connects the steering wheel switch to the wiring harness further down the column. But if you can see the switches working where they enter the PCM it is unlikely that this is the problem. If all of the inputs are working and the cruise is not, it very well could be the PCM.
Can you get Forscan where you are at? www,forscan.org. You'll also need an ELM327 adapter and a laptop. Then you can look at the PCM data and see if it is seeing the inputs.
Can you get Forscan where you are at? www,forscan.org. You'll also need an ELM327 adapter and a laptop. Then you can look at the PCM data and see if it is seeing the inputs.
Thread Starter
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New User
Joined: Feb 2020
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From: Italy, Verona
Searching on google I found a post here in this forum, where a boy following the complete revision of his Bronco change accused cruise problems, I was therefore wondering if it could be my case
Laughing Gas
Joined: May 2007
Posts: 793
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Found a discussion which may prove helpful. Naturally, this presumes that your '95 caravan uses the same logic as the pickup truck's computer which handles the cruise control.
https://www.ford-trucks.com/forums/1...l#post16180280
From the original description of cruise control not working after transmission (gearbox) overhaul, this indicates that the system is not getting at least one of the required inputs. My vote is to first focus on whether the computer is getting a speed signal and then work the rest of the troubleshooting guide.
https://www.ford-trucks.com/forums/1...l#post16180280
From the original description of cruise control not working after transmission (gearbox) overhaul, this indicates that the system is not getting at least one of the required inputs. My vote is to first focus on whether the computer is getting a speed signal and then work the rest of the troubleshooting guide.