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Cheades

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Posts: 5
Reply with quote  #1 
My 2007 E250DPXSUA had been running great and then about 2 times in 30 seconds it slowed down for a second before finally slowing down for good with less power. Only error though is the 12v error. Testing at home found the #1 injector didn't work but the injector tests fine. If I move the #1 injector wire to the #3 then the #3 doesn't work. I checked from power pin thru injector to ground pin at the EMM and it has continuity so wiring is fine.

I attached the fault log, anything I can do besides but a new EMM?

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GEB

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Posts: 2,184
Reply with quote  #2 
Hi,
    Re the code 26 in Occurred Faults, is it still showing up in Active Faults ? When performing static tests if the system volts are low ( in this case because the battery volts are low) then the test results can’t be relied on.
    This code 26 has occurred 5 times in the last 3 hours. 
From the fault code list in the back of the Manual.
 Code 26: Battery voltage <12 V below 2000 RPM or < 12.5 V above 2000 RPM. Perform stator/charging tests. 
     
Have you performed these stator/ charging tests, Refer screenshots below.
    
In particular note the “Important Message” in screenshot #2 Fuel Injector Static Test.
      Cheers
       GEB

Screenshot #1 System Voltage Test
967F5EA2-D1C1-479C-A480-4B269211D4B0.png


Screenshot #2 Fuel Injector Static Test
4AB87BA5-4B7B-4102-BD2F-1F110675D387.png 

Screenshot #3 Stator Tests

26F68E54-587B-4D38-980E-35DC04D81129.png 


__________________
Stacer 389 Territory Striker
Model No.E25DTSLAFC
Serial No. 5503333
Mid North Coast
New South Wales
Australia 
The learner will not shear the rams.

GEB

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Posts: 2,184
Reply with quote  #3 
Quote:
Originally Posted by Cheades
My 2007 E250DPXSUA had been running great and then about 2 times in 30 seconds it slowed down for a second before finally slowing down for good with less power. Only error though is the 12v error. Testing at home found the #1 injector didn't work but the injector tests fine. If I move the #1 injector wire to the #3 then the #3 doesn't work. I checked from power pin thru injector to ground pin at the EMM and it has continuity so wiring is fine.

I attached the fault log, anything I can do besides but a new EMM?


Bump.
Do the experts have any advice re this post and my reply

GEB

__________________
Stacer 389 Territory Striker
Model No.E25DTSLAFC
Serial No. 5503333
Mid North Coast
New South Wales
Australia 
The learner will not shear the rams.

ElderSparky

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Posts: 993
Reply with quote  #4 
"I checked from power pin thru injector to ground pin at the EMM and it has continuity so wiring is fine."

I'm probably not correctly following that sentence properly but as I interpret it that is not how the injector electrical circuit should be.

One of the two injector pins is connected to the 55 V bus on the engine.  It should have around 30V present on it at key on/engine not running and 55 V when the engine is running.  The other pin connects back into the EMM at the injector output drive.  This internally is like a switch which is connected to ground when the EMM fires the injector.  So measuring continuity from the power pin thru injector to ground pin at EMM sounds wrong to me.

You would have to be careful of ohmmeter polarity when performing that continuity test as reversed polarity of the meter could indicate a false continuity through device body diode.  Positive voltage lead of the ohmmeter would need to be on the power pin.

When OP swapped #1 & #3 injectors leads, problem appeared to follow injector leads.  That seems to point to a failed injector driver in EMM.  My experience with driver failures is that they fail in a shorted condition rather than open.  A shorted driver rapidly makes the injector too hot to touch and generally ruins same.  There is no indication of this condition in the description.

Cheades

Registered:
Posts: 5
Reply with quote  #5 
What I meant by checking continuity is I unplugged the wiring harness at the EMM and checked from the EMM power supply pin all the way thru the injector to the EMM injector return pin for the #1 injector (so the injector was hooked up like normal for this test). When I did that, it had about 3.4Ohm total resistance pointing to the injector being fine.

Having the key on for the motor has not made the injector hot at all. I just charged the batteries up so they have a full charge and it still had the same problem.

I just checked and put the #3 injector lead to the #1 injector and tested it, the #1 injector clicked just like normal then so it appears to be fine.


ElderSparky

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Posts: 993
Reply with quote  #6 
Thanks for clarification for me.  That makes more sense to me now.  Seems like you have pretty much covered the bases.  You could double check continuity tests by using voltmeter applied between engine block ground and low side injector pin (not the white 55V bus wire).  Test fire the injector.  You should see a momentary dip in voltage (30 V before you test fire injector).  Compare results between #1 & #3 injector.  That should pretty much conclusively point to #1 injector driver in EMM being inoperative.
SteveA

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Posts: 3
Reply with quote  #7 
i have an EMM if you require it. Let me know the part number.
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Steven
Cheades

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Posts: 5
Reply with quote  #8 
Thanks, I picked up one from Huey.
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