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Old 07-30-2002, 11:41 PM
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pmizell pmizell is offline
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
M103 engine out of fixed operating mode but.. on-off (lambda) ratio readings are fluctuating wildly -- 4-7% at idle, 40-45% at 2k rpms. According to the manual, this means I either have a bad EHA, or the wiring upstream between EHA and CIS-E control unit has an open circuit, no? (BTW, wonderful article on this topic Steve)

Off to test the EHA's mA readings but I don't have the "test cable" or harness that the manual refers to in gathering these readings.

My question is: can I get any meaningful values at all out of the EHA with just my DMM, or is it absolutely necessary to have this harness?

If the latter, I suppose I'll run by the dealership tommorrow to pick one up.

Thanks in advance for any insight in this area!


'91 300E, 216K miles
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