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[Bluenose]

Hi Guys, first post so be gentle. I bought a 2.7 CRD a few months ago, spent some-time recutting injector seats and cleaning up after a severe case of black death, so the engine now runs sweet as a nut. Now i used to be a fitter so useful enough with the mechanics of things so the injectors were easy enough but as i fired it up after doing the work the MIL came on showing a P0700 error and it won't shift past 1st gear...it will select reverse but won't go past the 1st forward gear either in Drive or selecting manually, mechanics i can do...electrics...now thats another story. I've looked on t'internet and it seems its a relatively common thing, and possible causes are Speed sensor, TCU, Throttle Position Sensor or even a Battery fault. I'm presuming it's an electrical fault as the car hadn't moved in a couple of months and there wasn't an issue with the gearbox before it was parked up, can you guys confirm these are the things i should be looking at and point me in the right direction for cheap parts should i need them! Many thanks

[Panic mechanic!]

I had something similar a few weeks ago when I hadn't used the jeep for 2 months, turned out to be the battery was knackered and was not holding enough power to run the transmission control module but having said that I know of  2.7 crd that had the same problem and it ended up being the transmission control module had died.

[jay140285]

Hello - It was my mother in laws CRD that has the exact same problem.

The V8 suffers with the speed sensor, but that gives un even idling and rough changes before going in limp home mode.

Chances are that on your CRD it will be the transmission control module. Easy to change, it is located on the right side on the centre console.

Where the arm rest is etc. you have to remove the centre and you can see it to get the serial number off.

Jeep wanted around £800 for one, they are not that easy to source been a part that does fail. The one I got was from Lithuania from a breakers over there.

Cost £120 delivered and was plug and play (because the serial numbers were the same), if the serial number of the replacement is different it may have to go into Jeep to be re configured, this can be anything from £40 to £100 depending on dealer.

[Bluenose]

Thanks for your help guys. I thought i best to eliminate one possibility and change the battery, as the old one looked like it might have been on the car for a while. Well i fitted a new Bosch battery and crossed fingers but unfortunately it didn't work, it's still not shifting out of 1st, in fact i now have a couple of additional errors which i believe refer to the charging system. P1511 and P0620...i'm now officially confused, can anyone shed more light?
Incidently the battery i had on originally was not the right one for the car...it was only an 80Ah one with 660 CCA where as the one i got which is recommended for the car is 95Ah and 800CCA. I do have a code reader and it allows me to erase those two codes but as soon as i start the engine they are back again.

[Panic mechanic!]

hi, p1511 is a battery hi/low code  and p 0620 is a charge circuit code so it may be that your alternator has departed this world, you need to get a voltmeter  and check the output from it.

[Bluenose]

Right guys, alternator checks out fine...checked both at the output (back of alternator) and at the battery...both charging at 14.5 Volts.
Still got errors P0620, P0700 and P1511.
If i clear the codes using the little hand held scanner i have the MIL light goes out and no codes are shown using the key trick, but as soon as the engine is started the codes return.
Think i must be getting to the point where i need to get it diagnosed properly unless someone has anymore advice?
If i do need to have it hooked up to a machine to diagnose it fully can anyone recommend some-one reasonably priced in the North-West preferably Manchester...the two Stealerships i spoke to wanted £80 + VAT or £98 + VAT which sounds a bit excessive   

[Bluenose]

Right guys, i bit the bullet and got it hooked up to a diagnostic machine at a Jeep Stealership
Codes
P0700 - Solinoid Supply Volts incorrect
P1511 - ABS Can message missing
P0620 - Generator Field Control Malfunction

Mechanic seems to think it will be a simple case of a break in the wiring somewhere or loose connector in the ABS/Speed control system...does anyone have any advice on the most likely places i should be testing with my multimeter or does anyone have any circuit diagrams for the 2.7 CRD?
Mechanic basically said the ABS sensor also does the speed control ie telling the gearbox the road speed and when to change gear but if that message isnt being received due to a break, then the gearbox will go into limp home mode and show the MIL just as mine has done, it gets a bit more difficult when he mentioned that the signal also routes through one of the brake switches on its way to the PCM

[daggie]

the o/s/rear abs sensor it the speed pickup apparently

[Bluenose]

the o/s/rear abs sensor it the speed pickup apparently

Apparently it's the front N/S and then switches to the rear O/S if that fails....or at least thats what the service guy said...i'm not getting an ABS warning...just been and checked..when i do disconnect the sensor i do then get a warning in the dash, unless of course its a seperate circuit from the sensor for ABS and speed...thanks anyway Daggie, much appreciated to have taken the time to reply

[Dutch]

the ABS sensor also does the speed control

Aha !!!!!! this rings a bell.  On a round trip to Ollanda last year, on the way back, 80'ish in the outside lane, for no apparent reason, abs light comes on.  No MIL or anything else and truck just keeps going as it has always done, apart from the fact that the cruise control didn't work anymore.  Cruise is also tied in to the ABS thingamabob.

Was coming up for MOT and the guys here say that if you ABS dont work it is a fail.  cleaned out all my speed sensors at the wheels and all that malarky... still no go.

The general consensus was that the ABS controler was fubar and needed replacing...... 750 quid off the shelf @ dealer excl. installation.

Gave Carlos a shout and he came up trumps with a replacement that did not work after installation but then the truck went in MIL, limp home, 1st gear scenario.

Ended up with an ebay replacment, cap in hand to dealer at 20 MPH and being pulled off the dual carriage way by coppers for going to slow, ending up calling recovery chappy who turned up in a van, no no no cannot pull me, permanent 4wd and all, and then ended up being escorted by him through the back lanes    and lo and behold, plug in and ......happy days.

In all was still a couple of hundred quid worse off but at least this saga was over.

I'll have a hunt for my thread on the matter.

[Bluenose]

the ABS sensor also does the speed control

Aha !!!!!! this rings a bell.  On a round trip to Ollanda last year, on the way back, 80'ish in the outside lane, for no apparent reason, abs light comes on.  No MIL or anything else and truck just keeps going as it has always done, apart from the fact that the cruise control didn't work anymore.  Cruise is also tied in to the ABS thingamabob.

Was coming up for MOT and the guys here say that if you ABS dont work it is a fail.  cleaned out all my speed sensors at the wheels and all that malarky... still no go.

The general consensus was that the ABS controler was fubar and needed replacing...... 750 quid off the shelf @ dealer excl. installation.

Gave Carlos a shout and he came up trumps with a replacement that did not work after installation but then the truck went in MIL, limp home, 1st gear scenario.

Ended up with an ebay replacment, cap in hand to dealer at 20 MPH and being pulled off the dual carriage way by coppers for going to slow, ending up calling recovery chappy who turned up in a van, no no no cannot pull me, permanent 4wd and all, and then ended up being escorted by him through the back lanes    and lo and behold, plug in and ......happy days.

In all was still a couple of hundred quid worse off but at least this saga was over.

I'll have a hunt for my thread on the matter.

That does sound similar to mine desn't it?...thanks Dutch!....it all went a little above my head and when he said speed signal comes from ABS then goes through brake switch my head started to hurt...he was kind enough to print off a circuit diagram of the abs controller connections and true enough there are 4 wheel speed inputs but only one vehicle speed signal connector so presumably this circuit is the one giving me trouble, can i ask how much it cost you to get another off ebay and was it plug and play...presumably all you have to do is clear the codes with a bog standard code scaner?

[Dutch]

Was only 45 quid.

As said ended up at dealer, scan ABS control unit, could not get any data (ie. unit did not speak to their scanner)
left car there.  Got replacement off ebay, let dealer install, then everything was ok.

Fannying about with the dealer still set me back 250 quid or so.

If the ABS ecu is truly gone this is what you need.   http://www.ebay.co.uk/itm/JEEP-GRAND-CHEROKEE-WJ-ABS-UNIT-BREAKING-PARTS-SPARES-/140749352469?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item20c550ae15

Although this is for a 4.7 V8 it is the same box. (they say it'll fit all WJ's but I'm not too sure about that)  I got one for the 2.7 CRD at the time with exactly the same part number.
They always sell the pump with it but you can get the ECU off the back and put it in, its a bit fiddly mind but I even managed with my two left hands.

[Dutch]

Had a further look on ebay and there are loads of these on there.  Worth to have a look around and make a couple of phone calls.
...... once again if that is your problem which only a dealer scan can confirm.......

Aaaaand found my thread buried deep in the archives..... there ya go

http://www.birtydastards.com/frm/index.php?topic=16452.0

[Bluenose]

Had a further look on ebay and there are loads of these on there.  Worth to have a look around and make a couple of phone calls.
...... once again if that is your problem which only a dealer scan can confirm.......

Aaaaand found my thread buried deep in the archives..... there ya go

http://www.birtydastards.com/frm/index.php?topic=16452.0

Thanks again Dutch...found one juest a few miles away from me for £36  http://www.ebay.co.uk/itm/JEEP-GRAND-CHEROKEE-ABS-PUMP-WJ-99-05-/250868086094?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a68e7354e
I'm at the stage where i don't mind swopping a couple of bits if it's not too expensive...beats the £80 an hour labour charges at the dealership any day....and if they don't work then they'll be kept for spares incase i ever do need them so not really missed out.....i'll let you know how it goes!

[Dutch]

And on a totally different subject....... has your forum name any thing to do with the famous yacht of the same name or is it just a discoloured bodypart due to an excessive drinking habit   

[Dutch]

There we go again .... must be growing tired of me now....

My intro on Birties all these years ago was MIL, limp home mode, intermittant or no gear changes issue.....

turned out to be that my gearbox needed a programming upgrade .... something to do with the Jeep IT not talking correctly with the Mercedes IT

Dr. Mike Pavelin helped me out with that one.



Just throwing it in the pot.

[Bluenose]

And on a totally different subject....... has your forum name any thing to do with the famous yacht of the same name or is it just a discoloured bodypart due to an excessive drinking habit   

Neither!!...tis a nickname given to Everton supporters....spent ages thinking of some witty, memorable nickname and failed miserably so just went with whatever came into my head at the time!

[Bluenose]

There we go again .... must be growing tired of me now....

My intro on Birties all these years ago was MIL, limp home mode, intermittant or no gear changes issue.....

turned out to be that my gearbox needed a programming upgrade .... something to do with the Jeep IT not talking correctly with the Mercedes IT

Dr. Mike Pavelin helped me out with that one.



Just throwing it in the pot.

Had a ZJ Jeep before 4.0l Ltd running on LPG...thing was falling to pieces but as i liked it i vowed to get another when i had the means...So went on ebay...saw a car that was being sold with a bad case of black death...and i mean REALLY BAD!...fixed it properly by recutting injector seats etc and thought i'm good to go...should have known better...it is a Jeep after all....Still it only Cost me £1850 and only 80k on the clock so can't grumble too much i guess...just have to hope i get to the bottom of this fault without it costing me too much. MIL light wasnt there when i started, so bugger knows if i've damaged something or its because its sat without turning over for a few months
Oh and i would have thought when they hooked it up to their diagnostic machine this morning they would have known if it needed a software upgrade...or i am giving dealer mechanics too much credit

[Dutch]

Best advice I can give is stick with it ... ok could cost a bob or two but then again it is a brilliant machine.  Just drove mine to pick up my youngest muppet from cycling
and once again was reminded of the class, road presence, comfy ride, luxury .... did I mention the ride...... tomorrow off in the CJ again so I've got quite a comparison to draw here