Thanks for the ref info Chuck, I may try and read it again this week end.

I am never too worried about whether its a 20ma KOEO car or a 10ma KOEO car as I am very confident in my test hook-up. The actual figure plays no other part in my diagnostics. I use it as a reference when hooking up new meter.

In the case of this fault, I would think the controller is seeing an open circuit at times causing instantaneous current changes which can't happen in real life. If it system is tracking -2ma and the circuit opens to 0ma this can't really happen that quick but it will probably make no difference in performance that one would notice. I am just speculating or what the controller thinks it is seeing.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician