Cruise Control Problem
Thread Starter
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Member
Joined: Feb 2020
Posts: 15
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Ya all getting off in the weeds.
When the CC is on and engaged, "operating" the foot brake does two functions with CC.
1. The pressure switch under pressure in that condition CUTS power to the CC unit that comes through that switch {when unoperated} to knock CC off.
2. A 12 volt signal is applied (to) the CC through another terminal, does the opposite by "Inhibiting" the CC from further control of the throttle.
This is a double safety mandated by Law as a safety to prevent CC from pulling you into an accident by shutting it down along with the ON/OFF switch control and Acell switch that does not work {as fast} as the brake function.
In some designs the Horn is wired into the system as a knock-off when powered.
While brake lights are a sign the foot switch may not be working, the lights themselves have no effect on the CC.
It would be design foolishness to bring anything extra into it for such an important function that needs fast reaction time and not function because a light was out.
It is still unknown if the system test is being done properly and what the response is to the testing.
All that is being done is replace parts that's not getting it done.
If the CC light comes on when entering the test, it is being powered through the pressure switch and some other fault is the cause.
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If an after market pressure switch other than a Ford part has been installed, it may be a cause of failure.
The reason is the switch is going open cutting power to the CC unit because the switch is not compatible or designed to work 'to spec' in a Ford CC system. One example is when the engine bay heats up, brake fluid expands a small amount that can open the pressure switch then you have no CC function. This pressure switch has to be sensitive to both high and low (not very low) pressures and to 'live' under very high pressure without failure, it's made special for this application The switch design was done by Texas Instruments Co.
.
You have to take a fresh look at your issue.
When the CC is on and engaged, "operating" the foot brake does two functions with CC.
1. The pressure switch under pressure in that condition CUTS power to the CC unit that comes through that switch {when unoperated} to knock CC off.
2. A 12 volt signal is applied (to) the CC through another terminal, does the opposite by "Inhibiting" the CC from further control of the throttle.
This is a double safety mandated by Law as a safety to prevent CC from pulling you into an accident by shutting it down along with the ON/OFF switch control and Acell switch that does not work {as fast} as the brake function.
In some designs the Horn is wired into the system as a knock-off when powered.
While brake lights are a sign the foot switch may not be working, the lights themselves have no effect on the CC.
It would be design foolishness to bring anything extra into it for such an important function that needs fast reaction time and not function because a light was out.
It is still unknown if the system test is being done properly and what the response is to the testing.
All that is being done is replace parts that's not getting it done.
If the CC light comes on when entering the test, it is being powered through the pressure switch and some other fault is the cause.
.
If an after market pressure switch other than a Ford part has been installed, it may be a cause of failure.
The reason is the switch is going open cutting power to the CC unit because the switch is not compatible or designed to work 'to spec' in a Ford CC system. One example is when the engine bay heats up, brake fluid expands a small amount that can open the pressure switch then you have no CC function. This pressure switch has to be sensitive to both high and low (not very low) pressures and to 'live' under very high pressure without failure, it's made special for this application The switch design was done by Texas Instruments Co.
.
You have to take a fresh look at your issue.
Member
Joined: Nov 2019
Posts: 20
Likes: 0
if you haven't done the master cyl recall fix then possibly that is the problem. it fixed my cruise. https://www.brakeandfrontend.com/for...ion-is-a-fuse/
Thread Starter
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Member
Joined: Feb 2020
Posts: 15
Likes: 0
if you haven't done the master cyl recall fix then possibly that is the problem. it fixed my cruise. https://www.brakeandfrontend.com/for...ion-is-a-fuse/
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Time to start all over.
Explain how you did the CC test so we can see if it's correct. And what trouble flashes you see/and when.
The same CC controller in the engine bay has been used since the late 80s except the control cable specifics to the throttle plate lever arms.
Same control switches and arrangement , as well.
Explain how you did the CC test so we can see if it's correct. And what trouble flashes you see/and when.
The same CC controller in the engine bay has been used since the late 80s except the control cable specifics to the throttle plate lever arms.
Same control switches and arrangement , as well.
Thread Starter
|
Member
Joined: Feb 2020
Posts: 15
Likes: 0
Time to start all over.
Explain how you did the CC test so we can see if it's correct. And what trouble flashes you see/and when.
The same CC controller in the engine bay has been used since the late 80s except the control cable specifics to the throttle plate lever arms.
Same control switches and arrangement , as well.
Explain how you did the CC test so we can see if it's correct. And what trouble flashes you see/and when.
The same CC controller in the engine bay has been used since the late 80s except the control cable specifics to the throttle plate lever arms.
Same control switches and arrangement , as well.
Same as all forums.
Hold OFF turn key to on but not run. Then the rest within 5 seconds.
Run
Resume
Coast
Set/Accel
Get cruise light once when entering test. No other lights or flashes.
Refer to above string to all that has been replaced
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
A look at the Ford schematic shows the following:
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
Thread Starter
|
Member
Joined: Feb 2020
Posts: 15
Likes: 0
A look at the Ford schematic shows the following:
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
horn relay (as stated above) was not in the truck. I replaced it with a brand new one. Horn now works (as stated above). Sounds like a little kid horn but, works. Wondering if it is not getting correct power making it sound weak and not allowing CC to work past OFF in test?
No idea how to check 1000 omh resistance. Not good with a multimeter really.
Will check fuse 5. Not sure if you meant under hood or driver kick panel will check both.
Thread Starter
|
Member
Joined: Feb 2020
Posts: 15
Likes: 0
A look at the Ford schematic shows the following:
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
The OFF sw operated connects CC mod pins 5 & >>6<< together as the enter diagnostic signal. Ignition on feeds battery to the CC Mod.. This works if you see the dash lamp respond.
.
The ON sw. connects through a 1000 ohm resistor, through the Horn relay to fuse 5. >>>>>This does not work.
Resume, Coast and Set are all connected together with the On sw. offering different values of resistance to the CC module for their functions through the clock spring to CC pin >>6<<. >>> These functions all are not working.
You see the pattern?
.
Check fuse 5 for seating or being blown.
Check the Horn relay for seating and winding continuity.
Check the 1000 ohm resistance in series with the ON switch function.
The fault is common to all the functions after the OFF switch is operated to ON and all other switches that are in common to the same circuit path.
Be sure the brake off normal switch is adjusted so it is not on full time or it will inhibit all functions from ON switch request as it is supposed to normally do if operated.
Good luck.
Clock spring is new too.