Gear box control W202

[Pjam27]

Is there a control unit that looks after the auto gearbox? if so and I repalce it will it solve my erratic gear change? And finally where is it?

 

[television]

If the box is a 722.6 then yes it will have one, the 722.6 box did not start till mid 1996

 

[vijilants]

Is there a control unit that looks after the auto gearbox? if so and I repalce it will it solve my erratic gear change? And finally where is it?

Is is in the passenger footwell

 

[bigasotonuk]

Hi,
A Selsdon500 says its in the passenger side footwell behind a steel plate that is attached via 3 6mm plastic nuts, check for oil on the looms as this could of caused the failure of the ECU, if there is oil contamination present you will need to replace the pilot bush on the gearbox. A common fault with the 722.6 gearbox.
I can,t say that will resolve your harsh gear changes, have you checked your GB oil level?

 

[Pjam27]

726.6 gearbox W202

How can I tell if my gearbox is 726.6? vehicle was first registered Jan 1996?

 

[television]

How can I tell if my gearbox is 726.6? vehicle was first registered Jan 1996?

Then it will not be an electronic box or fault. How is the fluid level

 

[Pjam27]

Fluid level is fine. Basically erractically at lower gears the box bangs when it changes 2-3. Not every time, you can control it with careful use of the accelorator but it always catches you out whenmforgotten. Does it in reverse too!

 

[television]

Then it could be a vacuum pipe of the box

http://www.detali.ru/cat/oem_mb2.as...GA=722422&CT=GA&cat=09S&SID=27&SGR=195&SGN=09

 

[Pjam27]

is that something I could fix myself? Thanks for your help

 

[television]

Yes just trace those pipes and make sure that they fit well and no splits in the pipes

 

[Pjam27]

sorry, just to save time, where is the vacuum pump located? Thanks

 

[television]

This is nothing to do with the pump as the vacuum for the box comes from the engine inlet manifold as in the diagram in the link where the engine is shown

 

[Pjam27]

I assume those pipes run underneath the chassis? Can you throw any light on this ancillary sympton?
When the car comes to rest after braking it then seems to have a little thrust almost as though it's accelarating on it's own, foot nowhere near the accelorator at the time? Thanks

 

[television]

The pipes leave the top of the engine and drop down to the gear box passenger side over the rwar of the engine.

If your idle is too high then the car will try and move when held by the brake,,RPM of about 750 is OK if its going up to 1200, the the ecu is not being switched over to the idle control

 

[rugbypeter]

can any one help i have a c240 auto gear box on kickdown has started to slip been told my be low on oil can some one tell me how to check pete