I have KDJ120 D4D 5 Spd Auto (750F) UK spec built in Dec 04. I lost 5th gear so took it to my gearbox specialist who had a look. He tested it, nothing wrong. I picked it up and lost 5th gear again. He then took the valve block out, tested all the solenoids with nothing physically wrong traced the fault to the Gearbox ECU.
I sourced a second hand ECU and now the car has all 5 gears. HOWEVER - when the gearbox shifts there are ‘shocks between various changes. These are upwards 4>5 and when slowing down under engine/braking from 3>2 and 2>1. If I kick down from 3>2 and 2>1 the changes are perfect. Changes are smoother when the gearbox is cold.
In terms of resetting the ECU, the battery has been removed. I have also tried techstream but I get a message saying the ECU can not be reset. Techstream is not showing any fault codes at all. I have done about 400 miles of both highway and urban driving and the changes are, if at all, only getting minimally getting better.
I am concerned about long term damage to the gearbox. What are my next options…
Thanks
I sourced a second hand ECU and now the car has all 5 gears. HOWEVER - when the gearbox shifts there are ‘shocks between various changes. These are upwards 4>5 and when slowing down under engine/braking from 3>2 and 2>1. If I kick down from 3>2 and 2>1 the changes are perfect. Changes are smoother when the gearbox is cold.
In terms of resetting the ECU, the battery has been removed. I have also tried techstream but I get a message saying the ECU can not be reset. Techstream is not showing any fault codes at all. I have done about 400 miles of both highway and urban driving and the changes are, if at all, only getting minimally getting better.
I am concerned about long term damage to the gearbox. What are my next options…
Thanks
