Cruise control not engaging in 6th gear.

[CristoOtto]

Good day all. Hopefully i can get some solid help here because i am out of ideas now. My cruise control works like a dream through all gears except in 6th. It runs like a dream. No error codes or issues at all. I have checked everything i can think off. Might be a setting on Forscan that i have missed.
any help will be appreciated.

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[airline tech]

What speed does this happen?

 

[CristoOtto]

All speed. No matter what i do. It just wont engage in 6th.

 

[Jason B]

You are in South Africa; Rangers are different there. Do you have manual or automatic transmission?

 

[CristoOtto]

It is a 3.2 6speed manual. 4x4

 

[ControlNode]

This site is mostly filled with North American owners, and here that transmission was not even an option, no manual was here. Our only engine and transmission option was the 2.3 Ecoboost with 10spd auto. (10R80 I think). May want to try a forum more directed to ZA, EU or AU areas where manual transmissions were available.

First, I have no knowledge of how Ford implemented cruise control on that ZA model, so these are just possibilities, but may lead to your answer with additional research. Now just general testing: If you have Forscan, you could monitor related sensors, like the neutral position switch from transmission to make sure while in 6th it's not reporting that it's in neutral. If the transmission was changed, does it have the right gear ratios to the original in all gears? I know some ECU's will determine gear based on rpm sensors related to the input and output shafts of the transmission to calculate the gear it should be in, and if the calculated ratio does not match any expected ratio (withing x%) it assumes neutral. Input should be Engine RPM or a sensor on the input shaft. Output sensor could be anywhere from a sensor on the output shaft to one at the rear end, or even just using the ABS sensors and adjusting the RPM based on rear diff. If using ABS sensors at the wheels changing the axle ratios could even mess up that calculation.

 

[CristoOtto]

This site is mostly filled with North American owners, and here that transmission was not even an option, no manual was here. Our only engine and transmission option was the 2.3 Ecoboost with 10spd auto. (10R80 I think). May want to try a forum more directed to ZA, EU or AU areas where manual transmissions were available.

First, I have no knowledge of how Ford implemented cruise control on that ZA model, so these are just possibilities, but may lead to your answer with additional research. Now just general testing: If you have Forscan, you could monitor related sensors, like the neutral position switch from transmission to make sure while in 6th it's not reporting that it's in neutral. If the transmission was changed, does it have the right gear ratios to the original in all gears? I know some ECU's will determine gear based on rpm sensors related to the input and output shafts of the transmission to calculate the gear it should be in, and if the calculated ratio does not match any expected ratio (withing x%) it assumes neutral. Input should be Engine RPM or a sensor on the input shaft. Output sensor could be anywhere from a sensor on the output shaft to one at the rear end, or even just using the ABS sensors and adjusting the RPM based on rear diff. If using ABS sensors at the wheels changing the axle ratios could even mess up that calculation.

Thank you very much. Your feedback here helped me sort out the problem. I recently changed to a bigger diameter tyre. Also changed the diameter on Forscan. I went and changed it back to what it was and now all is working again as it should.
thank you kindly.

 

[ControlNode]

Thank you very much. Your feedback here helped me sort out the problem. I recently changed to a bigger diameter tyre. Also changed the diameter on Forscan. I went and changed it back to what it was and now all is working again as it should.
thank you kindly.

Awesome, that is an odd issue indeed. I would suggest you make sure your local Ford Customer Service is aware as changing the tire diameter setting to correct the speedo should not impact the cruise control. Feels like they did some math from inputs/variables they should not have used for cruise control or selected gear determination. Perhaps there is an update to the modules to address that if others had similar issue and reported it.

 

[got3fords]

Thank you very much. Your feedback here helped me sort out the problem. I recently changed to a bigger diameter tyre. Also changed the diameter on Forscan. I went and changed it back to what it was and now all is working again as it should.
thank you kindly.

But your speedometer is off now? I guess you can live with a little speedo error in order to have working cruise control.

 

[airline tech]

Since some owners have reported having a - Com code error after changing the tire size (U0422)
Vech Config Data from the BCM is reported on the HS-Can 1 network
Cruise Control also reports data on the same network to the PCM

With a manual transmission - if I remember correctly when you change gears (via clutch -press) you deactivate the CC and you have to reenable it after you have changed gears.
So, the tire size change has possibly (generated a code) out of programmed norm and the code is deactivating the CC (as it has determined invalid data) perceives.
Since our US Version does not have to be (Reactivated) like a manual trans does. The CCM is losing a data input at whatever speed he has reached by 6th gear - so it is speed related somehow.
be it a (min or max) speed while in 6th gear for the CC to engage.
I do not have access to the manuals required for proper diagnostic, so we need to find a specific Forscan line to change to allow the (Manual Trans to Engage CC in 6th) with the larger tire size in the parameter.
We would be looking for any CC engagement setting

 

[airline tech]

Or another possible solution, post your new Tire Size and another member that has adjusted can give you a possible setting to set and this may give you a happy medium to have both, a close to accurate Speedo and a working CC in 6th
Mine are stock so I cannot help with this other than what others have posted works for them.
So, play with the numbers (trial & error) would be my solution to see if I can have both.

 

[CristoOtto]

But your speedometer is off now? I guess you can live with a little speedo error in order to have working cruise control.

The difference is so minute. I took it for a drive and compared to true speed. I can live with it.

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