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MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Phil Cake on July 26, 2010, 2:18 pm

Year of Manufacture *: 2002
Engine Size and Code *: 2.5 v6 kv6
( Optional ) ECU Type: siemans ems2000
( Optional ) Scanner Used: sykes spi/ carman litescan
( Optional) Fault Codes: p0155 p1472 p1641 p1647

owner complained of intermittent management lamp on and loss of fuel, temp and rev gauges

Retrieved fault codes p0155:upstream o2 sensor heater even bank electrical,p1472: variable intake butterfly valve always open, p1641:can bus failure, p1647:can instrument pack message fault.cleared fault codes and road tested, p0155 & p1472 return. Checking on freeze frame data this occurred at 1300rpm whilst ect was at 33 degrees c. Carried out tests on lambda sensor to find heater circuit o/c and lambda sticking up around 0.7/0.8v intermittently and when voltage switching it switches slowly as does odd bank pre cat sensor, checked inlet motor,however only have checks for unit supply and no actuation tests,supply was ok(new lambda sensor and complete inlet manifold have already been replaced early this year,lambda was for identical fault but inlet was for loose flaps however the inlet motor has also been replaced under warranty for failing)whilst checking vehicle under stationary conditions the gauges then dropped off indicating no revs,no temp gauge but with fuel gauge still reading,on handset revs and temp reading correct with no fault codes? upon checking live 4 gas data co was high at 1.95% and hc up too at 256 both at idle once rpm raised this returns to normal

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by phil cake <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1048' width='330' height='300' border=0 style='border:none;'> on July 27, 2010, 9:01 am, in reply to "MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"

sorry for not explaining exactly what i was after on the previous posting but to further the posting from yesterday i have looked up these code descriptions on 2 different sites (scangauge.net and skpang.co.uk) and came up with conflicting descriptons for the codes,can anyone give a definitave description? here's what i found;p0155:o2 sensor heater circuit malfunction bank 2 sensor 1, p1472:electrodrive fan 2 operational failiure (passenger side), p1641:fuel pump primary circuit failiure and p1647 wasn't listed on these sites however checking this in UKat archives there is a jag with the same code but the description is the same as i just listed for p0155.As i mentioned yesterday the gauges dropped off, this seems to be worse if you leave the car in direct sunlight and they came back to life when i cleared a p0155 fault code (they do come to life for customer when car is driven), anybody had anything like this? intermittantly the trip computer will display either Err or pppp any ideas what this means? any help would be appreciated.

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Leslie Smith on July 27, 2010, 5:31 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"
Message modified by board administrator July 30, 2010, 3:03 pm

Direct sunlight. Your not in Scotland then.

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Lee Pritchard on July 27, 2010, 11:12 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"
Message modified by board administrator July 30, 2010, 3:03 pm

Hello phil,

We still get a lot of these mg/rover vehicles in our workshop due to being an mg/rover dealer years ago.

There was a bulletin years ago on the instrument packs coming up with those `err` fault,the only fix was to fit a new a reprogram a new one in.

As to the `butterfly always open` fault,its the variable valves in the manifold seized up,common fault,sometimes when you force them to work with the scantool the start working again,hard to get ones separate,comes as a complete manifold.it doesn't affect the emissions from experience.

As for the o2 sensor just hook it up to the scope and see whats going on,and carry out a resistance check an the heater circuit.

As for the p1641 check that the ecu isn't full of water as the drain tubes get blocked.

hth lee

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Phil Cake <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1048' width='330' height='300' border=0 style='border:none;'> on August 10, 2010, 2:12 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"

Hi LEE,
thanks for info about the instruments.Going back to the manifold, we fitted a brand new manifold
Sept 2009 because the flaps were very noisey/chattering.The motor in the manifold then
Stopped working Feb 2010, our supplying dealer sent a motor seprately and submitted it for warranty claim. Apart from e.c.u.'s getting submerged is there any known faults with wiring or perhaps a rework on wiring when a new manifold is fitted,or does a re-configation need to take place? Otherwise it looks like we have another motor gone up the swanny which seems a bit bizarre.The first 2 threads were written by the technician doing the job and did'nt explain clearly all the issues.
SP Diagnostics description for P1614 was 'can bus error', but Scanguage.net gave 'fuel pump primary circuit failure'.The second thead also mentions other discrepancies with descriptions.
Can you or anyone else reading these threads come up with any other descriptions or clarificationsof the true meanings.

Regards

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on August 10, 2010, 4:46 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"
Mark Carter

Hi Phil, do you know anybody with T4 or DEC?
If so it may be just as easy to get the vehicle read with a more suited tool. HTH

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by lee pritchard <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1074' width='330' height='300' border=0 style='border:none;'> on August 10, 2010, 10:55 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"
Lee Pritchard

Hi phil,

We've had a few vis valves being faulty,there is probably loads of mg/rover vehicles running around with the valves innop,the customer wouldn't notice when driving.vis valves seem to be a fault code often.They were on back order last week,we had to get one of a scrap car.

There is no configuration for the valve,just fit em and go.Wiring is pretty good on those compared to a renault etc.

Is the p1674 a permanent fault?i will have a look tomorrow to see if i can find some info for you.

regards lee

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by Phil Cake <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1048' width='330' height='300' border=0 style='border:none;'> on August 12, 2010, 3:15 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"

Hi Lee, in your experience having been a dealer is known for these motors to pack up frequently of their own accord are they getting spiked ?
You listed in the last post P1674. It was P1647
and was'nt live.It was that code and P1641 that
we were getting conflicting descriptions.

Cheers

Phil

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by lee pritchard <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1074' width='330' height='300' border=0 style='border:none;'> on August 13, 2010, 12:51 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"
Lee Pritchard

Hi phil,

There is no obvious reason for these valves to be failing just poor quality from my experience.

Cant get codes from workshop manual,as they are in the t4 diagnostic tool,(poor design)vehicle has to be plugged in to read fault description.

May be worth using a scope to view the can signals just to see whats going on.

p1647 in my book is `can data bus-defective,trouble codes stored in other systems`.

Is this vehicle fitted with a fuel burning heater by the battery?had trouble with one of those causing a can fault in the past.

cheers

lee

Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #

Posted by lee pritchard <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1074' width='330' height='300' border=0 style='border:none;'> on August 13, 2010, 1:32 pm, in reply to "Re: MG ZTT 2.5 V6 2002 - Fault codes P0155, P1472, P641 & P1647 #"

Hi phil,

My first job after dinner was an airbag light on a zt 190 02,traced fault to airbag ecu faulty.

Whilst i had t4 connected to the car i had a look in engine ecu for fault codes.there was no fault codes in engine ecu before i started,and there was one-

p1647 can instrument pack fault-signal not in valid range`!

Possible causes in description list-

gearbox ecu(tho this car is a manual)

or ems 2000 ecm!

but im thinking that because i had disconnected the airbag ecu with the ignition on that this code has come up.

Maybe this will help you or just confuse things,check that everything works on the car and all the lights come on the instument pack.

h t h

lee

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