IPD sale Volvo Parts

The Magnetti Marelli ETM. Which cars have it?

Do you have a failing Electronic Throttle Module? What steps to take if you do, plus the latest ETM news. Volvo 1999-2002 models only please.
Post Reply
User avatar
abscate
MVS Moderator
Posts: 15447
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 1999 V70T5, 2005 V70
Location: NYC
Has thanked: 117 times
Been thanked: 384 times
Trinidad & Tobago

The Magnetti Marelli ETM. Which cars have it?

Post by abscate » Sun Dec 11, 2016 5:35 am

For reference

1999-2002 non turbo models
1999-2001 turbo models

Use the Italian throttle body referenced in this Forum
1 SWMBO for 30 years
2 Volvos
3 VWs
4 Careers
5 cats/dogs/gears
6 Perfect Ladies in waiting
7 Drivers
8 Boats- with a big pointy metal thing on top

1999 V70 T5M 56 2005 V70 NA M56 VWs BMW

precopster
Posts: 7196
Joined: Sat Aug 21, 2010 12:20 am
Year and Model: Lots
Location: Melbourne Australia
Has thanked: 3 times
Been thanked: 68 times
Australia

Re: The Magnetti Marelli ETM. Which cars have it?

Post by precopster » Wed Oct 03, 2018 1:02 am

Part numbers affected: 36001822, 8644347, 8644346, 9186793, 9207831, 9497244, 36050563

Models affected:

1999-2001 S70, XC70, S80

1999-2002 C70

2000 & 2001 S60 turbo

1999, 2000 & 2001 V70 turbo

36001821, 8644344, 8644345
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Part numbers affected: 36001821, 8644344, 8644345, 36050564

Models affected:

2000 & 2001 S60 non turbo

2000 & 2001 V70 non turbo
Current cars:2002 XC70, 2001 V70 T5, 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

xHeart
Posts: 2237
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 1997 854 NA
Location: Great Lakes - USA
Has thanked: 3 times
Been thanked: 17 times
United States of America

Re: The Magnetti Marelli ETM. Which cars have it?

Post by xHeart » Thu Jan 10, 2019 2:10 pm

Our 2001 V70XC appears to be on a white label Marelli. Details coming.
--
Golden Retriever | 2014 VIDA DiCE | 2013A XC90 +130kmi/210kkm | 2001 V70XC 1st Owner +190kmi/ +305kkm | 1997 Volvo 850 NA (2.5L/5) Sedan 1st Owner +172kmi/ +277kkm
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

xHeart
Posts: 2237
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 1997 854 NA
Location: Great Lakes - USA
Has thanked: 3 times
Been thanked: 17 times
United States of America

Re: The Magnetti Marelli ETM. Which cars have it?

Post by xHeart » Fri Jan 11, 2019 12:56 pm

The replacement ETM is yellow label.

The original white label was replaced a while ago with 146,000 miles on it -- but wasn't among the affected PN.

More here: https://www.matthewsvolvosite.com/forum ... 1&p=312472

Image
--
Golden Retriever | 2014 VIDA DiCE | 2013A XC90 +130kmi/210kkm | 2001 V70XC 1st Owner +190kmi/ +305kkm | 1997 Volvo 850 NA (2.5L/5) Sedan 1st Owner +172kmi/ +277kkm
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

User avatar
mrbrian200
Posts: 1355
Joined: Wed Jan 20, 2016 8:47 am
Year and Model: 2006 S60 2.5T FWD
Location: Northern Indiana/Chicago
Has thanked: 3 times
Been thanked: 61 times
United States of America

Re: The Magnetti Marelli ETM. Which cars have it?

Post by mrbrian200 » Fri Jan 11, 2019 1:29 pm

Note that the newer Bosch type throttle bodies aren't 'perfect' either - merely they are cheaper and easier to replace. Probably 1 in 4 problems I see in here where people with newer model years are getting MAF and/or idle and fuel trim issues I put the throttle body high on the suspect list. These are a little tricker to diagnose as in my experience the engine computer doesn't trigger a throttle body specific DTC unless the position sensor has gone bad or the throttle plate is stuck/won't move at all. There is a reverse DC that can be applied to the stepper motor. This can be observed with the throttle body removed from the intake, plugged into the harness: Key on engine off after 20 or so seconds the ECU tries to calibrate the throttle body position. The mechanism is dual spring loaded with a second spring that acts to rest the throttle plate around 5-7% at idle. During calibration the ECU will reverse DC to act against the idle stop spring to find out where "0" or fully closed actually is. My impression is Volvo goes a little too far in thinking they can use adaptive strategies to compensate for excessively worn internal throttle body mechanicals when the system just needs to 'give up' and throw a DTC. This may act different on newer ECU software update versions. I'm not sure mine has ever been updated after ~2008 or so.

precopster
Posts: 7196
Joined: Sat Aug 21, 2010 12:20 am
Year and Model: Lots
Location: Melbourne Australia
Has thanked: 3 times
Been thanked: 68 times
Australia

Re: The Magnetti Marelli ETM. Which cars have it?

Post by precopster » Fri Jan 11, 2019 4:48 pm

The main difference between Bosch and Magnetti units is that the Bosch units are reporting directly from the angle sensors to the ECM. Very little to go wrong on Bosch units apart from carbon sweep films and motor....and that very dodgy connector.

Magnetti units take the voltage from the angle sensors and interpret these voltages to the Canbus where throttle angles are reported. There is a power supply built into each throttle and a logic board with varying levels of firmware which does the angle interpretation. In many cases I have seen the films in perfect order yet only one throttle angle is reported correctly. The failing side is reported as 108 degrees. They also report absolute throttle angle through one of the wires to the ECM but if you have old software the car will go into limp.

The whole board on the Magnetti uses aluminum wedge bonds for connection between components. XeModex have found the weakness in these bonds and replaced the aluminium with copper wedge bonds. There are also a number of components on the board that can fail causing only one sensor to read (hence the 108 degree angle on only one sensor)

Another issue I found is that the round magnet has a layer of loose iron filings over which is an aluminium cover which can deform causing it to have "lumps" causing a short to the armature and blowing the 10A fuse for the throttle. The fix involves rolling the magnet like a rolling pin on a hard surface until it assumes a round shape.

On each end of the magnet are D shafts for the small sweepers. Magnetti designed one end of the shaft to be screwed on and held in place by Loctite. On some magnets there is a 10 degree variance because not enough Loctite was used to hold the sweepers at consistent and parallel angles to each other.

Under the circuit board is a stainless steel cover which is supposed to be smeared with conductive paste to help the board cool. I have seen many examples of little to no conductive paste being used causing premature failure.

Another major issue is that if you don't have updated software (post 2006) your car will go into limp mode on detection of only one sensor or a minor voltage fluctuation on the logic board and be mostly undrivable. I've advised more than one customer to get updated software INSTEAD of replacing the throttle IF both sensors are reporting and this has worked with great success.

Interestingly Lamborghini use EXACTLY the same throttles as Volvo for their Gallado and Murcielago range in the early 2000s. I recently converted two low mileage Murcielago units to contactless for a very insistent customer who had no diagnostic equipment and a "theory" that the films were the cause of his Lamborghini blues.
Attachments
20181223_152251.jpg
Lamborghini throttle
Current cars:2002 XC70, 2001 V70 T5, 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

xHeart
Posts: 2237
Joined: Sat Dec 03, 2011 8:05 am
Year and Model: 1997 854 NA
Location: Great Lakes - USA
Has thanked: 3 times
Been thanked: 17 times
United States of America

Re: The Magnetti Marelli ETM. Which cars have it?

Post by xHeart » Tue Jan 15, 2019 8:13 am

Thank you for sharing.
I now have VIDA2014D fully working. Using Freeze Frame is indeed a useful data set.

Reference: FUEL SYSTEM - Electronic Throttle System Troubleshooting:

"There will be a patch for VIDA from which point mileage (Km) will be included in the
ECM freeze frame data. This will allow a very quick comparison with the odometer to
determine if the fault has occurred as part of your fault tracing and should be ignored. E.g.
CAN network related codes can be set because the battery has run down while working
on the vehicle, with interior lights and other loads draining the battery.
The freeze frame will give the distance in Km. Multiplying this value by 0.62 you will get
the mileage. On a vehicle with a DIM (Driver Information Module) the distance can be
read from the DIM in Km for an easier comparison."

I do not see this parameter "point mileage" in our version of VIDA2014D.
--
Golden Retriever | 2014 VIDA DiCE | 2013A XC90 +130kmi/210kkm | 2001 V70XC 1st Owner +190kmi/ +305kkm | 1997 Volvo 850 NA (2.5L/5) Sedan 1st Owner +172kmi/ +277kkm
Past: German Shepherd | 1989 Volvo 740 GL | 1979 Volvo 240

Post Reply

Who is online

Users browsing this forum: No registered users and 4 guests