Smart Fortwo 451 - SAM Unit Removal and Repair - 3 Lines Fault
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- Опубліковано 3 лис 2023
- In this video I remove the battery and SAM unit on a 2008 Smart Fortwo 451 Passion 84BHP. The car had been displaying 3 lines on the dash along with warning lamp illuminated and there was a complete failure in selecting any gears. The fault was intermittent.
I scanned the vehicle for trouble codes/fault codes and the below were found:
N15/6 Sprintshift control module (2 DTCs)
P1800 Implausible transmission data.
P2802 Signals from incremental sensor of component 'M17 (Gear motor)' are implausible.
N47-5 (ESP control unit) (1 DTC)
Fault in CAN communication with control module 'N15/6 (Sprint shift control module)'.
The SAM unit (Signal Acquisition Module) was carefully dismantled and I discovered several failed solder joints on the circuit boards within the SAM unit and re-soldered (re-flowed) these.
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Disclaimer - Please be advised that my videos are not instructional and are merely footage of me, with many years of motor trade experience, carrying out vehicle repairs. Please conduct your own research, ensure you have the correct tools/necessary expertise and undertake your own due diligence before carrying out vehicle repairs. If in doubt, entrust an automotive technician.
Great video. As usual. Thanks for building the encyclopedia for our 451s. This makes them a durable vehicle we will enjoy longer!
Very helpful.
Many thanks.
Nice job! Mine still behaves, but good to know there's a good video documentation about it. Best Regards!
Very interesting, great job.
At first I thought you had the same fault I had, I got stuck away from home with no gears (in neutral), and then not even engine start after a few trys. Needed the RAC to get carried home. My codes were to do with clutch position circuit malfunction and clutch actuator open circuit.
Managed to bolt on a new actuator I ordered online and it worked I could drive again. Fault codes would not stay erased and engine/transmission light would come on. I asked a specialist to relearn/calibrate my clutch and clear the codes, and that worked. But I think the position I bolted the actuator on is not perfect the gears are slower and more clunky than before, so even though clutch is learned its not mechanically ideal. I didnt ask for it to be realligned. I'm just happy I can drive.
I have the newer instrument panel dash I think I dont get those 3 lines when there is a fault? It just flashed the N for me (and engine fault light). I think the older 451 might give the 3 lines if they have the same fault as mine did perhaps?
Do spare SAM swap over or are they custom to the car for security?
I don't imagine I would ever do any soldering but I can see me giving one to an electrical person to resolder if I knew I had a possible bad SAM.
Yanked it, thanks for the steps, and did inspection. It looked great, 0 cold joints. Reflowed the whole thing anyway. I’m an old solder tech from the 90s haha. Will find out if it worked tomorrow. Next step is clutch replacement (known good actuator). Thanks again!
This is basically like Chrysler's TIPM (Totally Integrated Power Module) . It does the same function. And they both can fail in the same ways. One good thing about the SAM boards, there are no "hot" spots from components that get really warm.
These are great videos; very informative! Yes the fortwo really are a technician's car. Working on hillman imps or mini minor for two decades will prepare anyone for the smartcar.
My 450 has been great and is now at 220,000km. After three non affective SAM missions I am now comfortable just giving it a tap when the car randomly stops; it instantly springs back to life like a starwars droid... I am of the opinion it is actually a faulty relay in the SAM causing the issue.
To protect from water ingress just place a piece of soft clear plastic across the SAM and clip it back in place.
The 450 engines are bullet proof once the chain tensioner guide is secured to the backing carrier with rivets. Hillman imps had exactly same problem.
It’s always great watching you go through the problems so clear and knowledgeable. Great video again
One of the best instructional videos I have seen. ( you even put it all back again) Thanks
I don't know yet, but it's possible this video has saved my car, all the way in California. Big thanks for making it.
Fingers crossed. I’d definitely be interested in an update after you’ve tested the car!
Finally some smart content again, cheers, mate!
Wow - nice job!
Your channel is pure gold!
Thank you - your feedback is really appreciated!
I'm really surprised that so many joints had failed/were failing. Excellent walk through and repair. Valuable contribution. 👍
Lead free solder, the heating/cooling and vibrations cause the breaks.
@@bobsoft Yep, if in any doubt re-solder all the joints with real solder
Fantastic video, I own a 2005 CDI and that SAM looks very similar to mine...Hmmm..? PLUS, coming from Canada, I've never seen a completely rust free smart floor panels! Wow!!
Keep up the great work.
Fantastic video. Hope I never have to touch the dam in mine but good to have a walk through vid👍👍
Good work my man!👍🏻
really good video thank you so much for the information. greetings from italy
Vielen Dank für dieses interessante und sehr hilfreiche Video!
Beste Grüße, Jürgen
Great Video! Cheers
Hi I’m in California and I think my car has this problem. Thank you for the video
Awesome video, thanks for recording all the details.
Can you make a video about installing a remote start on a 451 with factory alarm 🚨
Thanks really helpful video
Would you consider posting the wiring diagram you used to check all the connections in the SAM?
useful ....Thank you very much.😀
Traffic lamps! Very clever. If you suspected it was the SAM , I wonder if you could have given it a few taps to see if that would have intermittently corrected the problem.
You should talk to S2 smart about your 3bar problems, I find them very helpful
Thanks for the video, it's great information....I have a 2014 Smart Fortwo 451 ..... keyless system working buy key won't start the car and key sign on in dash ....I did a scan by Autel and found a couple errors ... 1- B11F0 The message from control unit SAM is not available on the CAN BUS ...2- C1312 CAN communication with module 10/10 SAM is faulty...3- C1301 short circuit or open circuit of CAN wire ...4- C1446 communication fault with Yaw Rate Sensor.
I checked already CAN ohm and voltage and short to ground all was good. I think I must open SAM model and check soldering spots.
Can you please advise
Hi, thanks for the video. I have a question, on my 2003 smart fortwo, the right turn signals don't work, nor on the screen when I activate the commodo but the left one works... the right one only works when I press the distress button. I've changed the switch but nothing's changed... do you think it's coming from this box? If it's coming from the box, what is the relay or circuit for the turn signals, do you know please?
The three line error can also be a result of fitting the wrong tail light bulbs! I’ve had two of these Smart cars and one was perfectly reliable and the other was a nightmare. My tip for opening the SAM and bending back the flexi circuits is to heat it all up well with a hair dryer, it’s less likely to break if it’s warmed up. The lead free solder used on these was poor quality, and coupled with a lack of good mechanical connection it’s only a matter of time before they fail.. to be fair the Ford Focus from 2007 or so onwards has identical issues in the instrument cluster.
Going to possibly buy a smart with low miles today all being well as a shopping trolley instead of relying on the Toyota Vellfire 3.5 V6 petrol.
Hi. Can you tell me where or what is responsible for the horn or its absence at the moment?? or which relay is responsible for the horn
Thank you, great video.
I do like how the European version of the gage cluster has a temperature display,
the North American ones do not.
The temperature gauge was unfortunately removed from later European cars but the earlier 451 models had it!
So....Did it fix the problem in the long run?
Hi. Could you write where the path to the horn is?
wonderful information, great content as always! now im pre armed incase i ever get this error 😂😂
also side note, now i know why there was a random 45 degree pipe piece kicking around in my battery compartment.. battery vent! i'll have to nosey in there and see whats going on with the vent pipe. its a good job i love projects, what with so many meddling fingers apparently never doing things right 😬
Fantastic video, no nonsense 👍 my wife just bought a 2008 Smart Fortwo and thought it was ok but didn’t check the hazard lights when I did a function test, tested last night and the hazards don’t work!! I’m guessing the SAM solder joints could cause this or is there a quick way to check ?
Would need to carry out electrical checks with a wiring diagram and multimeter first before going for the SAM. Could be something as simple as the switch which would be the best scenario, as that centre switch unit pulls out as one complete unit and would be simple.
Really useful video. I'm having similar issues with my roadster. Has this cured the 3 line fault?
Sadly not. Update video coming later today, once edited.
While all disconnected I would have bled off charges to clear the codes
Ah . . . As long as you have contact cleaner . . . blades on all the fuses
Is there any way of protecting the SAM from water ingress ?
None that I know, short of fabricating some kind of shield. Trick is to ensure there is no water ingress to the interior in the first place, then the SAM will remain forever dry but still not immune to poor solder joints!
I have a smart for two 2004. Lately after i took it for service, the car stops while driving or waiting for too long in traffic. At whiles it switches off then restarts on its own. Lately it shuts off while driving 😢. I've taken it to several mechanics, unfortunately no one seems to fix the issue.
Can anyone suggest what could be wrong with it.. The constant ongoing issues and repairs are becoming quite stressful..
I had very similar on a 450 and the wiring loom had worn through on the intercooler scoop.
How did you fit in there with the seat... lol... I have to pull mine out and its not comfortable... lmao
Kneeling on the ground and twisted round with my head under the dashboard. It wasn’t comfortable!
"a zeee unit?' or a zed unit?
Zentrale Einschub Elektrik = ZEE
How did u buy a smart with so many problems xD
Haha! To be fair, some of my videos are just routine maintenance but all the faults are very common on these cars and are jobs that most of these cars will need at some point. These cars do need quite a lot of attention and from someone who understands them.
Too fiddly for me 😂😂
Some of my proudest moments in my life have been when I cheated a mechanic out of MY money 😊
I am a mechanic and some of my proudest moments are cheating the manufacturer out of my customer’s money by making repairs instead of replacing expensive parts.
These little cars would have been so great if they were properly designed and given a proper gear box and a little more jam. They would have also been wise to offer a cable activated four wheel drive option. They should have also made little smart trucks. I loved driving my smart car but it was nothing but problems. It's a lawn ornament until one day when I get ambitious enough to give it a engine swap and redesign with some modifications to the suspension and chasis.