PeachParts Mercedes-Benz Forum - View Single Post - m116 engine code diagnostic port location?

JamesDean · #4 03-24-2014, 07:11 PM

The m116 is not compatible with ODB1 either.

It does have a duty cycle based diagnostic that may or may not be useful.

If you probe pin3(+) and pin2(-) at the X11 diagnostic port on the driver's side with your meter set in duty cycle/frequency mode the CIS-E unit will output a value.

Typically with the key on, engine off, it will output 70% duty cycle if federal, 85% if Cali.

When key on, engine on, it will output a % that after about 1 minute of running, should bounce around--ideally between 45-55 or so. If it remains at a fixed % then it it displaying a fault code.

That's all well and good if the engine is running but if the engine is off. I'm not sure if it can tell you anything.

To my knowledge CIS-E wont tell you anything about fuel, other than maybe that the EHA is bad.

Sparkplug wire run about $100. I picked up at set at AutoZone I think, no complaints.

Are you sure are getting spark at the plugs?