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Man Tgl 12.240 2007 - High Fuel Consumption Issues, Engine Revolutions

lukaszpuma 13893 19
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Why does my MAN TGL 12.240 consume about 30 L/100 km even though it drives normally, shows no major errors, and has constant engine revolutions?

The high fuel consumption was caused by a faulty boost sensor, and after fixing it the problem was solved [#16466566] Before that, the most useful diagnostic hint was to check the catalyst/DPF backpressure, because EDC fault 3785 can be linked to a plugged catalyst and pressure above 0.2 bar indicates a blockage [#16441964] It was also suggested to verify boost pressure in the low-RPM range and valve clearance, and not to blame the injectors just because the truck still had power and no other errors [#16442584]
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  • #1 16440171
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Hello, man, the problem with tgl burns about 30 liters with normal driving. I went to the mechanic and he checked everything on the computer using the man cat program. No errors, there were 5.4 ms injections, all the same parameters. The revolutions of the 710 engine are the same all the time. The only problem was the combustion temperature because it showed 300 C. I will add that the car is loaded or empty, the same goes. It's going very well. On the road I caught 2 errors 03779-01 and 03785-01. Burning on the computer shows 20 l. But I suspect the wine was fueled until I refueled at another station and it was OK. What's up where to check. How do you have any ideas what to check. Under it tells me where to find the lambda probe, I would try to disconnect it. best regards
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  • #2 16441380
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1696
    The two bugs you catch are what they relate to EDC, FFR, ZBR or something else.
  • #3 16441740
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Both bugs were in EDC. Can you tell us where the exhaust gas temperature sensor is? And what are these cut wires for? Man Tgl 12.240 2007 - High Fuel Consumption Issues, Engine Revolutions
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  • Helpful post
    #4 16441964
    svavecone
    Level 25  
    Posts: 586
    Help: 73
    Rate: 452
    EDC 3785 is associated with the catalytic converter, which can also be associated with increased fuel consumption. The diagnostician should do a test drive with ManCat connected and the exhaust pressure monitoring before CAT. This signal is not specifically monitored for a fault by the EDC so no error will occur. Any pressures above 0.2 bar indicate a plugged catalyst.
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  • #5 16442100
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    The ride was said to have all parameters normal. It is strong whether it is loaded or empty. If he was clogged, he wouldn't have the strength.
  • #6 16442141
    andrzej20001
    Level 43  
    Posts: 17696
    Help: 1568
    Rate: 6610
    But when he sees it clogged, it can enrich the mixture
  • #7 16442345
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    I will take up to 10 liters on the weekend, I will start up and wash the washer with liquid.
  • Helpful post
    #8 16442366
    svavecone
    Level 25  
    Posts: 586
    Help: 73
    Rate: 452
    Washer ... you say. Remember that this is a DPF type cat, not a CRT. Personally, I would recommend further diagnosis before using the "washer". :)
  • #9 16442518
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    I'm coming back from 2, the foreman says that the filter is ok. He said to replace the air filter and remove the injectors. Because when he checked it on 4 it is the worst. But she also spreads her hands. What is going on because I don't know anymore.
  • Helpful post
    #10 16442584
    svavecone
    Level 25  
    Posts: 586
    Help: 73
    Rate: 452
    What about the boost pressure readings, not too much in the low RPM range? Valve clearance?
    Since it has the power and without errors, I would not bet on injections.
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  • #11 16442788
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Man drove to Man's site in the radio. We'll see what they say. They called from mana and say that everything is ok, they have to adjust the valves. But I don't know if it will help.
  • #12 16443067
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1696
    Adjusting the valves will never harm the engine if done correctly, it is an activity that is often ignored and very important.
  • #13 16444762
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Today I came back from the site nothing showed. They uploaded a new soft to the box and ECU update. The difference is because it does not drag on anymore. I have put in a new air filter. But I don't know if it will help. I think there may be injections. I'll let you know when I leave.
  • #14 16445241
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    So how can I help if everything is ok? no edc errors after visiting the site?
    what did they do with 3779 and 3785?
    often in this model the lambda probe or a bent socket around it in which it is installed for repair.
  • #15 16446934
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    I also think that the lambda probe may be damaged. Maybe someone knows where this probe is?
  • #16 16446954
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    On the silencer in front of the harmonica - flexible, only as I wrote to you above, the probe will generate an error, cracked, broken, damaged cable, disconnected plug, internal error in the computer - so it's probably a waste of a thousand for a change if it's ok?
    Drive a bit and wait for the error.
  • #17 16446988
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Well, tomorrow I will check it, but it amazes me that with the engine off, it shows the exhaust gas temperature of 300C.
  • #18 16447013
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    It will change if the probe starts working and heats up.
  • #19 16462202
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    Well, even on a warmed up engine it is 300C. I reset the counter and the average fuel consumption drove 30 km empty. Average consumption 31l per hundred. I already have no ideas, maybe someone has a spot on a good specialist in the vicinity of Radom. Pany injections learned from all regenerated. However, one thing wonders for me today I connected the delhi because this is the only one I have, I checked the outside temperature and it showed me 40 C as it was 10C outside. I was with a friend who has the same Mana showed 10C which is good. Does it have any impact?
  • #20 16466566
    lukaszpuma
    Level 11  
    Posts: 77
    Help: 1
    Rate: 33
    The problem is solved, the cause was in the boost sensor. You can close. Ps svavecone mate is a real MAJSTER. best regards

Topic summary

✨ The discussion revolves around high fuel consumption issues in a 2007 Man TGL 12.240, with reported consumption of approximately 30 liters per 100 km despite normal driving conditions. The user consulted a mechanic who found no errors in the EDC system but noted a combustion temperature of 300°C. Two error codes (03779-01 and 03785-01) were identified, with the latter linked to the catalytic converter, which could contribute to increased fuel consumption. Suggestions included checking the exhaust gas temperature sensor, lambda probe, and boost pressure readings. The user later reported that the issue was resolved by replacing the boost sensor, leading to improved performance and fuel efficiency.
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