cruise control not keeping set speed
#1
Driver
Thread Starter
cruise control not keeping set speed
My 2008 RX400h does not maintain set speed on cruise control. Speed increases on down hill and does not increase going uphill.
#2
The speed should not "increase" beyond the set speed when you are going up a hill, or are you saying that you have trouble forcing the vehicle to accelerate when you push the accelerate button on the cruise control?
#3
Driver
Thread Starter
When you say speed increase, do you mean that the speed increases beyond the set speed? I would think that if you want to maintain the speed with engine braking, you would use the 'B' mode on the shifter.
The speed should not "increase" beyond the set speed when you are going up a hill, or are you saying that you have trouble forcing the vehicle to accelerate when you push the accelerate button on the cruise control?
The speed should not "increase" beyond the set speed when you are going up a hill, or are you saying that you have trouble forcing the vehicle to accelerate when you push the accelerate button on the cruise control?
Putting gearshift in B cancels cruise.
#4
It works correctly on the downhill (for RX 400h) since engine and brakes are not involved in D (use B for engine braking), but something wrong with driving uphill if your speed was > 30 mph (at <=25 mph cruise will be deactivated) - RX 400h has enough HP to keep the speed
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