Auto Gear Changing.

I have got a 2002 TD5 I have had it a couple of weeks and have noticed that it is not going through the gears as smoothly as it should. It seems to want to hold on before going to fourth and then it all settles down.

Any ideas.

Is this all the time or for the first few miles?? What mileage? When was the last ATF change?

Possibly low on ATF or ATF degraded & dirty filter.

Since you prob don't know the vehicle's servicing history, suggest ATF change, possibly reiterating it upon fluid condition (can only replace half the autobox capacity each time thence it is called ATF 'purification'). Once happy with ATF condition (color, smell, presence of solids, etc.) can then replace the filter.

PM me for specific procedure -- tried to attach but max allowed size for pdf file uploads is 19.5 kb per file!!

Rgds
Matt

Get someone with a nanocom or the like to check the output shaft speed sensor in the box is providing a signal. In laymans terms the torque converter is made up of two sets of paddles. One set is connected to the engine flywheel, the other set connected to the output shaft of the gearbox. The gearbox ecu gets an engine speed signal from the engine ecu. The gearbox then compares this to the gearbox output shaft speed signal. When both sets of torque converter paddles are equal ie converter stall, the box ecu knows the next gear can be selected and requests a reduction in torque from the engine ecu to make the change. If the output shaft is not providing a signal the the box ecu doesn't know when stall has occurred and thus hangs on to gears higher up the rev range to predetermined change points. This can also be accompanied with harsher changes.

If there is no signal being provided from the output shaft sensor when checking with nanocom or the like, then this can be replaced when you change the atf. The sensor can be accessed when you drop the gearbox pan to change the filter. The sensor is about £30-£40.

By checking the sensor operation first, it will save you doing the atf twice, as you will have to drop the gearbox sump again.

Many people report a vibration around 2250 revs on td5 auto's and this sensor is often the reason and overlooked.

Hope this helps.

Lee

sabredylan said:

If there is no signal being provided from the output shaft sensor when checking with nanocom or the like, then this can be replaced when you change the atf. The sensor can be accessed when you drop the gearbox pan to change the filter. The sensor is about £30-£40.

Click to expand...

Would you have a p/n for the output shaft sensor?

Thanks ahead of time.

Part number is STC4444 SPEED TRANSDUCER AUTO



Shown as 9 in pic.

Another thing to check is for condensation on wiring around passenger fuse box. This is usually due to poor sealing on windscreen/ sunroof. Condensation runs down wires and onto circuit boards of fuse box. I had a fault like this and auto box, ace and sls were affected. If your screen gets condensation on the inside on a regular basis, I suggest you check the fuse box. Split it half and look for water damage on circuits. It took me ages to find this fault. Also shows itself as delay in throttle operation, as water runs into the pedal wiring also.

Landrovers, don't you just love them!

Thanks for all the advice I think I will go for the ATF change and sensor check.