E240 Ignition Problem

[Alf G]

I have a Year 2000 W210 Estate, E240 Twinspark. It seems that the secondary ignition system is not working and is not being read by the diagnostic machine, which I think it is a Star.(An Independent guy has had a look at it) All fuses that I can see seem ok, unless there are any that are hidden in the depths of the car somewhere. Has anyone else had an issuse the same as this and if so any idea where next to look.

 

[television]

Hello Alf, so the car has been on STAR,, has it not said what the fault is

 

[grober]

The secondary or HT ignition system won't be read directly by Star but by inference from the primary LT part of the system. The HT part consists of 6 dual coils which fire 2 spark plugs per cylinder the HT leads and spark plugs themselves. Its highly unlikely that all the HT components would fail together so I would guess this means the engine ECU output to the coils is not working or the 12VOLT main supply to the coils is down. Usually the ECU works by earthing each coil at the appropriate time but I can't vouch for this particular model. Often on these cars its either an ignition switch/ alarm imobiliser problem malfunction preventing the appropriate 12volt supply reaching the engine ECU or ignition supply. It doesn't sound as if your garage man is familiar with Mercedes systems? Is the car not running/starting?

 

[television]

I agree 100% with your last line

 

[Alf G]

Thanks Guys. I have been having problems with the car cranking but not firing for ages, but the Snap-on Verus diagnostic gear was pointing me towards a MAF related problem, put new MAF unit on but still got same problems. CPS has been thought to be most likely culprit now but havent changed it yet. (There are two on this model) The car does run but is well down on power when you really put your foot down. The guy who has looked at it last week has worked on Mercs but said he had never seen this problem with the ignition ever show itself before. I will look into more next week now. Have a great Christmas and thanks for your replies. Alf.

 

[Steve@Avantgarde]

Only has 1 CPS and most likely your starting fault!

What was the fault codes on the Snap On Verus?

 

[grober]

CPS almost a dead cert.

 

[Alf G]

The codes on the Snap-on Verus were P2004 which read Hot film MAF sensor, and P2006 Right charge air temperature sensor, short circuit to positive or open circuit. Other codes it read were B1100 Communication over engine CAN bus is faulty. B1103 Fault in CAN Communication. I couldn't find out any more info from the Verus on these last two though. Any leads would be much appreciated.