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#1
08-10-2019, 06:35 PM
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ECU location C220 CDI W204 OM 646 2007
Hi, Possible intermittent "2054-00" error, "The analogue/digital controller of the CDI control unit is faulty" and the engine light is on, but now not any more.
To just check the wiring harness and those contacts I would like to know the location of the ECU as it is not visible in a cut out of the engine cover. The ECU is hidden somewhere, help! One chap bought a second hand ECU, unsoldered the EPROM with the security details, so the key works and then soldered that EPROM into the correct spot and saved himself a few bucks. Thanks. 
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#2
08-11-2019, 09:05 PM
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If this is the OM651 we are talking about the ECU is on top of the engine on top of the air filter assembly, its mounted to a hole where air is drawn in through fins on the bottom of the ECU to keep it nice and cool.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#3
08-14-2019, 04:35 PM
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In my W211 (2008 E320 with OM642) the ECU is in the back right corner of the engine bay underneath the cabin air intake assembly. Once the air box is out there are 2 10mm bolts and it pulls up. Had to dismount it to get to one of the upper control arm bolts when I recently redid the front suspension.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech
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#4
08-14-2019, 06:21 PM
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Aw yes, another one off poster, last activity was THE MOMENT he posted the thread.
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily 1992 Mercedes 300D 2.5 202,000 - Pure junk 2000 Mercedes E320 Black - 136,000 miles - Needs repair Don't forget to grease the screw and threads on the spring compressor.
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