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-   -   How to diagnose cruise control problems. (https://www.focusfanatics.com/forum/general-technical-chat/311984-how-diagnose-cruise-control-problems.html)

6SPD_soul 03-15-2011 03:09 PM

How to diagnose cruise control problems.
 
I just had some issues with my CC and have sorted that out, but I found there is a really slick self diagnostic procedure for the cruise control. You don't need a diagnostic scanner to do this either, just the car. From what you describe I think the cruise control servo (motor with a spool of cable that controls the throttle body for CC) is bad, but this test will tell you for sure where the problem lies. This self diagnostic test will work on all Foci from 00-05, in addition to many other Ford models in those years.

The test is basically this: you're going to be turning the ignition key on and off repeatedly and then hitting the cruise control buttons quickly in a specific sequence, and then the cruise control light will blink repeatedly, and the number of blinks tells you where the fault is. It's easy to do once you get it sorted in your head and you won't mess anything up if you don't get it right the first time.

If it's a manual, don't depress the clutch. If it's an automatic leave it in park. First, turn the ignition to the accessory/run position but don't start it. Press and hold the CC off switch and then repeatedly turn the ignition from run to off and back to run again, you should do this 3 or 4 times. End this sequence with the ignition in the run position and then let go of the off switch, and you should see your CC light blink once, which means it's ready to run the self diagnostic. If it flashes 5 times at this point then it's a faulty speed control module, which is that servo I mentioned above. Quickly after the light blinks (like a second after), you then need to hit the other cruise control buttons in this order, and you will need to hit them fairly quickly for the test to proceed:

1. On
2. Resume
3. Coast
4. Set/accel

The CC light should blink once after each button you hit. Kind of take your time hitting the buttons and it's easier to keep track of the flashes, which is important at the end because you need to count the number of flashes that come after you hit "set". There won't be an immediate flash after you hit "set", there will be a slight delay, and then will come another short series of flashes. This next part is all verbatim (except for the parenthesis) from the Ford guide I'm translating here.

0 Flashes (no flash after last button is pushed): suspect circuitry or speed control steering wheel switches.
1 Flash: Static test passed (cruise control should work)
2 Flashes: BPP (brake pedal position) switch is damaged, circuit is damaged, or the brake or clutch pedal was applied during test.
3 Flashes: Brake deactivation switch is open or circuit is damaged.
4 Flashes: Indicates the speed signal circuit is open or damaged (wheel speed sensors, ETC)
5 Flashes: Suspect circuitry or module.

So I guess try to run the test. It's pretty quick and easy once your thumbs get the button sequence down. Then you should at least have a better idea where the problem is coming from. Post back here with results, I'm curious where the problem is for you. Mine was the brake deactivation switch which I'm putting in soon.

[email protected] 03-25-2013 04:32 PM

Thanks i will give that a try.

desertrider 07-29-2013 12:14 PM

Thanks very much for the diagnostic test. I'll run it and report back the results.

LATER THE SAME DAY - OK, I tried various ways to get the Cruise Control to operate and it will not do so. No indication on the dashboard nor any part of operation (set, reset, coast, etc.)

Leora83 07-31-2013 12:22 PM

Beautiful! Thanks for a detailed informative description.
Brake pedal position switch, btw.

Many thanks!

meldav72 08-20-2013 01:48 PM

Do you think this would work on a 2012? I bought the car used in June, and I have used the CC but tried to use it this past weekend and nothing...

clownymb 09-11-2013 07:20 PM

Mine seems to be the BPP. Now I just have to go and figure out what that is. Haha. Thanks for posting this guide. Really helpful. Also, I found that at least on my car, I just held down the off switch and turned the car on once. Didn't have to do the on/off multiple times thing.

meldav72 09-11-2013 08:16 PM

Auxiliary preventing cc from working
 
I discovered on mine that for whatever weird reason, having my mp3 player plugged in in the Auxiliary input located in the glove compartment caused my cruise control not to work. I unplug the mp3 player and it works fine.

FordService 09-12-2013 08:26 AM

Quote:

Originally Posted by meldav72 (Post 4872309)
I discovered on mine that for whatever weird reason, having my mp3 player plugged in in the Auxiliary input located in the glove compartment caused my cruise control not to work. I unplug the mp3 player and it works fine.

Hi meldav72,

I recommend making an appointment at your dealership so they can take a look. Once you get a diagnosis, shoot me a PM if you need any additional assistance; be sure to include your name, phone number, VIN, mileage, and preferred servicing dealership in your message.

Crystal

[email protected] 10-17-2013 04:31 PM

thanks for that but ford just diagnosed the throttle body as the problem any one else have a throttle body problem

RSVT170 01-19-2014 12:26 AM

Just saw this thread! Mine and my roomate's Hatches both have non-functioning CCs. I'm going to do this right now on both!


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