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I'm pretty sure Sports mode alters the change points under hard acceleration.
The ZF boxes are pretty good for gear changes & I'm still betting it's actually being the lockup point ;) .
Can you do a test for me:
Cruise along at 75kph in "D" when you think it's in 3rd (as yours only goes into 4th at 80-85kph) & pull it back into "3" manually.
Do you feel it change back ?
I also tried that and theirs no change.Quote:
Originally Posted by Scouse
Ive also tried taking off in 3rd and shifting manually into D and still no change until i reach 80/85kms.
So it could be a fault with the lock-up solenoid valve then ???Quote:
Originally Posted by Scouse
Or the output shaft speed sensor I guess
Hopefully its nothing to major.
Ill try and get it in to see someone tommorow.
Thanks for all the replys
I have just been up the road, 4th drops in at 62 kph - just gently driving, and when I put it into sports mode it's just over 80 kph
What is your RPM at 60 and 80 - before it changes to 4th.
RPM at 60kms with foot just on throttle is 2000 and heading up to 80kms is 2500 and still hasnt dropped.
What happens if you are doing say 70Kmh when it has not changed into Top gear, and you manually pull the gear selector back to "3"?
regards Philip A
It doesnt do anything, But once it drops into 4th gear if i then pull back into 3rd gear then you feel it drop back.
It does change but not till over 80kms:confused:
Ah , the joys of electronics.
I think you should take it to someone with a Rovacom or Testbook and look at the faults.
I am certain that the behaviour you describe is not correct.
Lots of us here have experience with the older 4HP22 in which the changes are controlled by a kickdown cable which senses throttle position and changes the shift points accordingly. On light throttle a 4HP22 will change into 4th below 60KMH and I think the electronic version should also .
I guess that is why we all say that its the clutch locking that you can feel as it locks up at 85Kmh and is controlled AFAIK by the governor in the transmission which mechanically senses output shaft speed.
In your case the throttle position is sensed electronically from the ECU, and the road speed from the speed sensor, so it could be these sensors or some others at fault. It could be a faulty solonoid in the transmission valve body.
Regards Philip A