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Old 11-01-2003, 03:31 PM
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Join Date: May 2001
Location: San Francisco
Posts: 190
reading EHA current

In an earlier thread, Stevebfl said: "If you really want to watch the whole system use your amp-meter section and hook in series to read the EHA current. The EHA (electro-hydraulic actuator) is the mechanical result of all the electronic sensing. It is a controlled leak to the upper chamber pressure of the fuel distributtor."

Okay, I'm just printing out various posts as I'm about to go out and try out my new Sears DMM with Duty Cycle. My '89 260e has been experiencing power loss, runs rich (cat's smell), and I've seen the ABS light on intermittantly (already replaced OVP and cleaned ABS sensors). So now I'm going to go try and figure out how to test the system and use the DMM.

But I don't understand how to hook up the amp-meter in series with the EHA. Nor am I sure how to setup the Sears DMM for this. I've been through my CD Manual and did not see any info on the EHA, what am I missing? Can someone point me in the right direction, as I'd like to try and get through these tests this weekend. Thanks in advance.


1989 260E (276K miles)
1995 E320 (50K miles)
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Old 11-01-2003, 03:46 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,799
I've had good luck with crimp on bullet connectors like you get at Radio Shack or any electronics parts store. Pull the connector off the EHA, it's the device bolted to the back side of the fuel distributor and the connector comes in from the US passenger side to the driver side. Make two wires with a male bullet connector on one end and a female bullet connector on the other end. Use these wires to bridge the connector and the EHA. Cut the wire that goes to the rearmost terminal on the EHA and connect the DMM probes to this wire to measure current.

That's about as cheap and easy as I can figure.

95 S420
91 300SE
87 300SDL
83 300SD

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