Related faults.

[spudd]

I have now and again got the transmission service required message up. not had chance to do anything about it,have new valve body. but now getting problem with cruise control intermittent not working. not at the same time as transmission fault.

[Funky Diver]

I'm going to take a stab in the dark that it's a speed sensor... but best get it connected up to VIDA to read the actual fault codes.

[Tannaton]

Originally Posted by Funky Diver

I'm going to take a stab in the dark that it's a speed sensor... but best get it connected up to VIDA to read the actual fault codes.

Good suggestion - there are two speed sensors on the gearbox - input shaft and output shaft. The output shaft one I think goes out on the wider network from the TCM to drive the speedometer and cruise control. A condition of "implausible input shaft/output shaft ratio" (i.e. a situation where the TCM doesn't think the gearing is correct) will throw a Transmission Service Required message.

The sensors are on the outside of the gearbox and on their own separate wiring loom. I am specifically referring to the AW 5-speed auto fitted to 163 BHP cars, not sure if the TF-80 is the same?