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2007 C220 CDI Avantgarde W204
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Discussion Starter #1
C220 CDI W204.008 646 engine 2007 135,000km, engine warning light On.

Checked with my MB2 iCarsoft diagnostic, first DTC 2054-00 is:
"The analogue/digital converter to the CDI control unit N3/9 is faulty",

Have just driven 500 km for 35 l diesel, so 7 litres/100 km is nothing to worry about. User guide says to start worrying as I may damage the engine, but at least the consumption is OK. Question:
Does this error mean the engine is running on default values for injection volumes and other parameters? Anyone driven with the engine warning light on?
Taking the cover off from the ECU I noticed mechanics had already looked at the ECU as a plastic pin in the middle had been sheared off, which holds the cover to the ECU in place. Have they just wriggled the three contacts to the ECU to fix that same error?

Second error of 2054-007 is "Fuel temp sensor, open circuit or short" is easily tested via a multimeter before replacement, so that is no worry.
Buy a A0009050800 fuel temp. sensor, if that is the right model, from Aliexpress for US$20, take the corrugated air hose off, notice some brass colour below the fuel pump at the front, take plug of, check for 3 kilo Ohm resistance at the two pins, if open circuit or short use your 19mm spanner to replace it, that is what the web tells me.

Rather than taking the air hose off, etc. I thought I may as well buy the part and have it ready regardless of what the checking with the multi meter told me as I hope I can trust my iCarsoft MB2 diagnostic with the 2054-007 fault code for the B50 part with "Open or short" message. My engine warning light is on, so I hope it will disappear after as those two errors may be related.

A STAR diagnosis would cost me AUS$250 and then fixing the issue is a AUS$150/hr affair. Fora tell me voltages must be right as low voltages lead to all sorts of ECU problems, but in my case the voltage at rest is 12.5V and charging is at 14.5V.

How did you get those error(s) fixed?
 

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2007 C220 CDI Avantgarde W204
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68 Posts
Discussion Starter #2
Error message related to 2054-007 states: “The fuel temperature sensor B50 is open circuit or shorted out”. In my case the sensor still had about 1.6 kOhm resistance and 3 kOhm seems to be recommended, but anyway, I changed the part and have no more problems.

Take those fat air pipes off so you can see and work on the fuel temp. sensor. Pull out pin of clip RH side, remove (twist) pin in middle and on LH side squeeze edges in at connection to air filter. Have new part ready. Ask Dr Google for photos of location of sensor. Remove electrics. Take 19mm tube spanner out of your plumbing kit or use a very deep socket as 19mm ring is not easy to use as there is no room. Install new sensor, suggestion is 23 Nm torque.

No more 2054-007 error on diagnostic or similar. No more “Engine Fault” light on just before your next service is due!

This error is also allied with the 2054-00 error: "The analogue/digital converter of the CDI control unit N3/9 is faulty" - not so. Your ECU is not stuffed. The software has no clue if it is the temp. sensor or the chip in the ECU converting the temp. sensor’s analogue signal to digital, so it lists both.
 
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