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Old 14th July 2021, 11:16   #1
david twine
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Angry intermittent disengagement of cruise control

Hi all. I have an annoying intermittent problem with my R75 cruise control system where it either fails to engage or disengages whilst driving. The unit has been opened and checked out and all is clean, no corrosion, and no fault codes are registered on the ECU,via a TestBook diagnosis. Normally when failing to engage at all, if you pull over and switch off engine for a minute, then set off again, it all works fine for many miles. Any ideas ?? Really starting to p me off now. Its a 75 Saloon, Conno SE Petrol 2.5 Auto, Dec 2004.
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Old 14th July 2021, 11:55   #2
trikey
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I’d say a pedal switch is the culprit, try clicking it further towards the pedal
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Old 14th July 2021, 22:23   #3
cb750chris
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Hi David,
I would second Trikeys advice about checking the pedal switches.
If you ask whoever did your t4 diagnosis they should be able to check the operating point of the switches using the live data on the t4.

Or if you want to give me a shout I can check them for you.
Regards Chris
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Old 15th July 2021, 20:19   #4
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The other thing to check is if there are any abs faults - if the abs ring on the front right gives misleading speeds, then the cruise control could give up trying to maintain speed
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