CDT Auto NO forward gears

Prince_Leopold · 29th April 2015, 14:08

Hi,

I've got a R75 Tourer 2.0 CDT Auto

Today whilst out driving the car lost power with revs climbing high inbetween gear changes, it then went into 'EP' limp mode allowing me to drive home. Now when I select reverse the car creeps backward normally but in forward nothing happens apart from engine revs climbing.

I've checked the plenum chamber and it's dry, although we did have rain this morning.

I've tried disconnecting the battery for 45 mins but it's not had an effect.

I don't know if this is connected but I've had the car since January and it's always 'thunked' into drive with a bit of a jump.

I've searched the forums and solenoids and pistons are mentioned, any ideas what might be the problem in my case?

Thanks, David

marinabrian · 29th April 2015, 14:14

Quote:

Originally Posted by Prince_Leopold

Hi,

I've got a R75 Tourer 2.0 CDT Auto

Today whilst out driving the car lost power with revs climbing high inbetween gear changes, it then went into 'EP' limp mode allowing me to drive home. Now when I select reverse the car creeps backward normally but in forward nothing happens apart from engine revs climbing.

I've checked the plenum chamber and it's dry, although we did have rain this morning.

I've tried disconnecting the battery for 45 mins but it's not had an effect.

I don't know if this is connected but I've had the car since January and it's always 'thunked' into drive with a bit of a jump.

I've searched the forums and solenoids and pistons are mentioned.

Any ideas what might be the problem in my case?

Thanks, David

Best to get the car on T4 David, saves the guesswork.

Check to see if the inspection covers are in place in the inner wheel arches, especially the passenger side one.

I have seen a few cars now where the wiring to the under bonnet fusebox has been damaged as a result of these not being fitted

If you find the gearbox to be faulty, I know where there is an excellent secondhand one in a car being currently broken and diesel autoboxes are in short supply at scrapyards these days

Brian

Prince_Leopold · 29th April 2015, 21:01

A T4 diagnostic would be fab but the nearest one is 70 miles away and I only have reverse :-(

SD1too · 30th April 2015, 07:11

Hello David,

As you have correctly researched, your problem is likely to be solenoids or related to the reverse piston. It's relatively easy to check the solenoids electrically with a multimeter.

I regret to say that I disagree fundamentally with Brian's suggestion that you obtain a second-hand transmission. Some members have done this and ended up in a worse predicament than when they started.

Of course these gearboxes are always described as "good" or "known working" but what guarantee have you got? None; just the word of a scrapyard operator who probably received the car on the back of a flatbed and stands to make a tidy sum out of selling one to you. Over the years I have come to the conclusion that in the long term "repair what you've got" is the best philosophy.

By all means try T4; there are mobile people about. There's a club thread with details. But don't pin all your hopes on it. The results can be enigmatic and, in the case of an automatic gearbox, won't describe the failed component exactly.

Simon

GeoffWW · 30th April 2015, 09:43

To get you moving forwards, have you tried the sports or snow modes?

Prince_Leopold · 30th April 2015, 10:03

Quote:

Originally Posted by GeoffWW

To get you moving forwards, have you tried the sports or snow modes?

No I've not, I'll try that, thanks.

I've just checked the brake/clutch fluid level and it's just below minimum. It couldn't be that simple could it? I'm off to get some DOT 4.

I'll report back later.

Thanks very much for everyone's input

HenryD · 30th April 2015, 10:22

Quote:

Originally Posted by Prince_Leopold

No I've not, I'll try that, thanks.

I've just checked the brake/clutch fluid level and it's just below minimum. It couldn't be that simple could it? I'm off to get some DOT 4.

I'll report back later.

Thanks very much for everyone's input

It won't be that but low transmission fluid level will cause issues similar to what you have especially if you've had a rapid leak out

Jules · 30th April 2015, 10:35

What year is the car?
If it's pre 2002/3, almost certainly will need a reverse piston kit as described below.

http://www.the75andztclub.co.uk/foru...d.php?t=140572

Worth checking solenoids but I doubt if they would cause loss of all forward gears.

You can disconnect the Jatco ECU completely at the multi plugs near battery and it should still have some forward drive.
(because the gear linkage physically opens oil ways to the various pistons within the Jatco)

All the solenoids do is accept commands from the Jatco ECU to control the gear changes so they are smooth and at the correct time relative to road speed, engine RPM and throttle position.

Prince_Leopold · 30th April 2015, 10:38

Quote:

Originally Posted by HenryD

It won't be that but low transmission fluid level will cause issues similar to what you have especially if you've had a rapid leak out

Nope, topping up the fluid made no difference, but it needed doing anyway.

Trying snow/sport mode made no difference either

Strange how it's really strong in reverse but no forward gears at all

I have a friend coming over with a multi-meter later

I shall report back

Prince_Leopold · 30th April 2015, 10:42

Quote:

Originally Posted by Jules

What year is the car?
If it's pre 2002/3, almost certainly will need a reverse piston kit as described below.

http://www.the75andztclub.co.uk/foru...d.php?t=140572

Worth checking solenoids but I doubt if they would cause loss of all forward gears.

You can disconnect the Jatco ECU completely at the multi plugs near battery and it should still have some forward drive.
(because the gear linkage physically opens oil ways to the various pistons within the Jatco)

All the solenoids do is accept commands from the Jatco ECU to control the gear changes so they are smooth and at the correct time relative to road speed, engine RPM and throttle position.

Thanks for that Jules

It's a 2002 model

So at least I should be able to limp to a garage

29th April 2015, 14:08	#1
Prince_Leopold Regular poster Rover 75 Touring Join Date: Jan 2015 Location: Derby Posts: 35 Thanks: 23 Thanked 1 Time in 1 Post	CDT Auto NO forward gears Hi, I've got a R75 Tourer 2.0 CDT Auto Today whilst out driving the car lost power with revs climbing high inbetween gear changes, it then went into 'EP' limp mode allowing me to drive home. Now when I select reverse the car creeps backward normally but in forward nothing happens apart from engine revs climbing. I've checked the plenum chamber and it's dry, although we did have rain this morning. I've tried disconnecting the battery for 45 mins but it's not had an effect. I don't know if this is connected but I've had the car since January and it's always 'thunked' into drive with a bit of a jump. I've searched the forums and solenoids and pistons are mentioned, any ideas what might be the problem in my case? Thanks, David __________________ Jobs done: in-line thermostat; low clutch drum replaced by Austin Garages of Burton-on-Trent (www.austingarages.co.uk); Arctic two-speed gold resistor radiator fan; Viton intercooler O rings; inverted bonnet cable divider block; Arctic stainless steel handbrake compensater. Last edited by Prince_Leopold; 29th April 2015 at 14:10..

29th April 2015, 21:01	#3
Prince_Leopold Regular poster Rover 75 Touring Join Date: Jan 2015 Location: Derby Posts: 35 Thanks: 23 Thanked 1 Time in 1 Post	A T4 diagnostic would be fab but the nearest one is 70 miles away and I only have reverse :-( __________________ Jobs done: in-line thermostat; low clutch drum replaced by Austin Garages of Burton-on-Trent (www.austingarages.co.uk); Arctic two-speed gold resistor radiator fan; Viton intercooler O rings; inverted bonnet cable divider block; Arctic stainless steel handbrake compensater.

30th April 2015, 07:11	#4
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,374 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hello David, As you have correctly researched, your problem is likely to be solenoids or related to the reverse piston. It's relatively easy to check the solenoids electrically with a multimeter. I regret to say that I disagree fundamentally with Brian's suggestion that you obtain a second-hand transmission. Some members have done this and ended up in a worse predicament than when they started. Of course these gearboxes are always described as "good" or "known working" but what guarantee have you got? None; just the word of a scrapyard operator who probably received the car on the back of a flatbed and stands to make a tidy sum out of selling one to you. Over the years I have come to the conclusion that in the long term "repair what you've got" is the best philosophy. By all means try T4; there are mobile people about. There's a club thread with details. But don't pin all your hopes on it. The results can be enigmatic and, in the case of an automatic gearbox, won't describe the failed component exactly. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

30th April 2015, 10:35	#8
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	What year is the car? If it's pre 2002/3, almost certainly will need a reverse piston kit as described below. http://www.the75andztclub.co.uk/foru...d.php?t=140572 Worth checking solenoids but I doubt if they would cause loss of all forward gears. You can disconnect the Jatco ECU completely at the multi plugs near battery and it should still have some forward drive. (because the gear linkage physically opens oil ways to the various pistons within the Jatco) All the solenoids do is accept commands from the Jatco ECU to control the gear changes so they are smooth and at the correct time relative to road speed, engine RPM and throttle position. __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

30th April 2015, 09:43	#5
GeoffWW Loves to post Rover 75 CDTi Tourer Connoisseur SE Auto, Also fully restored Mk 2 1966 MG Midget Join Date: Apr 2007 Location: Manchester Posts: 314 Thanks: 49 Thanked 59 Times in 46 Posts	To get you moving forwards, have you tried the sports or snow modes?