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  #16  
Old 01-10-2003, 01:03 PM
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Good job, Mike. That definitely should do it. I made my own from new connectors available through MB, but the figuring out the part numbers ain't worth it. You will have to get some extended meter leads though.

I'm goin out right now and order me a spare.

I envision MB to be backordered by the end of day.(bg)
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Continental Imports
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  #17  
Old 01-10-2003, 01:20 PM
evoboy
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Steve,
Huge thanks for the information.

K-jet is not my thing so would you mind answering the following :-
What is the function of the EHA and what does it stand for ?
Is this appropriate to non CAT cars ?

Many thanks.

Oh Yes , just 1 more thing , is it possible to read fault codes off the Diag socket with a multi-tester , if so where could I get the code tables.

Cheers

Gary
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  #18  
Old 01-10-2003, 01:23 PM
LarryBible
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evoboy,

The codes are read in the form of a duty cycle. There are no more than 10 and you will need a factory manual to decipher them. This is on a Federal car. The california cars are different with something more akin to OBDI.

Good luck,
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  #19  
Old 01-10-2003, 03:40 PM
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EHA, elctro hydraulic actuator. So the controller is going to administer varying current flow through this device. The current flow is going to deflect valving thru magnetism to allow a very precise internal fuel leak.

Internal pressure on both sides of the diaphram separating the two halves of the distributer hold the delivery valves shut and no fuel flows. The lower chamber is fed through an oriface that allows the bottom chamber to be reregulated to a lower pressure. Under normal, zero current, flow the pressure differential (upper to lower) is .4bar. A 60ma negative current shuts off flow causing there to be no differential pressure and no fuel flow - decel cut-off. Cold, starting, enrichment is about +60ma or more. This runs the differential pressure to over a bar. Normal driving control runs in the -10 to =10ma range and this is about .1bar in the differential pressure.

Usually the fuel pressures follow the electrical control and just monitoring the electrical is all that is needed. But if what is happening electrically doesn't follow the symptoms it can be necessary to veryfy that what the electrical is supposed to do actually happens.
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  #20  
Old 01-10-2003, 04:34 PM
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Perhaps the EHA is electrically sound, but mechanically unable to respond correctly to the electrical input as I think Steve's last paragraph says.

I'm sure you've already seen this, but...http://business.baylor.edu/Richard_Easley/autofaqs/EHA.jpg
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