From SWAMP'S DIESEL PERFORMANCE
How to check my FICM voltage with a multimeter or voltmeter
***FICM voltage tests should be performed with the engine oil COLD (ie, close to ambient air temperature). This will force the FICM into it's inductive heating strategy, which will give you a worse case scenario/voltage reading. If the engine has been run (within 5-6 hours of this test), then the warm engine oil may not give you an accurate FICM voltage.
On all 2003-2007 Ford 6.0L Power Stroke diesel engines you will find the FICM bolted to the drivers side valve cover...you may need to unbolt the coolant reservoir from the 'cowl' so that you can get your arms/hands back there to work on the FICM.
You don't need to drain the coolant...just unbolt the bracket that hold the coolant reservoir, and gently move it as far out of your way as possible. Be careful, as there is a plastic coolant connector that can be cracked if the coolant jug is handled forcefully.
On the top of the FICM, you will see a diamond/oval shaped metal plate...remove the two screws from that plate (Torx#20).
under that plate you will either see 7 "lugs"...or 4 "lugs" (depending on the year of the truck)...
if you have a "7 lug FICM"...you want to put one lead from your multimeter onto the upper left "lug"...and the other multimeter probe to ground (bare spot on the cylinder head, alternator bracket, negative battery terminal, etc).
If you have a "4 lug FICM"...you will want to check the lug on the right (closest to the drivers side fender).
be careful NOT to lean the probe on the FICM lug...over onto the aluminum case...you might let the smoke out, LOL...
Have someone turn the key to the 'on' position (don't crank it yet)...and see what your FICM voltage is. It should be >46volts.
Next have someone crank the engine...and see what the FICM voltage is while cranking...again..should be >46volts.
Go ahead and start the engine...and see what the voltage is while idling.
If the FICM voltage drops below 46 volts...then it is "bad"...
we have seen FICM's as low as 17volts...some 19v's...some in the twenty's and low thirties...
obviously...the lower the voltage...the 'worse' the FICM is...and the more likely that (cold) rough running would be a result of a bad FICM.
however..if you email (or call) us and say that your FICM is dropping to 43-44volts...while low..I think that you may have some underlying injector issues that may be contributing to your cold rough running, as much as the slightly low voltage FICM
What are the advantages of the 58v vs. the 48v FICM?
Since 99% of 6.0L injector problems are associated with the spool valve, the higher voltage of the 58v FICM can minimize
intermittent injector firings (misfires), by creating a stronger magnetic PULL on the spool valve. The 58v FICM also moves the spool more quickly (mechanically), which slightly advances the mechanical injection timing…which is beneficial to both performance and fuel economy.
Are there any reliability issues with the 58v FICM?
No, we have kept extensive records, regarding our FICM warranty rate…and there is not an appreciable difference in warranty issues, related to either voltage. Our overall FICM warranty rates are well under 1% failure. Any FICM we ship will have a one year
warranty, though we fully expect much longer (than OEM) life expectancy, from either of our FICM models.
Do I need to do anything else if I purchase a 58v FICM?
No. Any fuel injector will operate properly with a 58v FICM.
What are the disadvantages of the 58v vs. 48v FICM?
Other than the slightly higher cost, there are no disadvantages.
What does the PHP hybrid performance FICM tuning do?
While Ford is constantly revising the software to balance (cold) injector performance with FICM reliability…Swamp’s Diesel has reverse engineered the hardware and circuit board components on the FICM, which allowed us to find the ‘weak spots’ in the Ford design. We install ~30 individual, & higher rated circuit board components than even a “new/reman” Ford FICM, as well as address any ‘cold solder’ joints which plague the factory units.
PHP has reverse engineered the ‘code’ within the FICM, and supply’s us with a hybrid flash…which melds the best attributes of all the various Ford flashes/FICM calibrations, for the most performance, and best fuel efficiency possible.
I am running a tuning device…do I need to do anything?
No. Any tuner on the market (SCT, Edge, Bullydog, Banks, etc) is only reprogramming the ECM, not the FICM…so you do not need to uninstall nor reinstall, your ‘tuning’ with either of our FICM models.
Ford/my mechanic has concerns about the FICM…
No problem. Our experience (thousands of FICM units) has shown that there is no extra ‘wear’ or stress on the electrical or mechanical components of the fuel injector, the vehicle charging system nor electrical/wiring system. The signal duration to the fuel injector remains unchanged, so while we are, modestly increasing the output voltage, the signal duration is so brief as to have no affect on any peripheral components.
Let’s put this into perspective…
The ‘old’ 7.3L Power Stroke, operated a very similar injection system. “Oil fired” injectors…with signaling sent by an Injector Driver Module (IDM). Since late 1999, “140v” performance IDM’s have been produced…which is an increase from the factory IDM output voltage of 110v. We have never seen, nor heard of a single instance of “a” 140v IDM damaging a single injector.
The real difference in injector reliability lies in the design of the valve. The 7.3L ‘poppet valve’ actually has a tapered seat, so that the valve & seat can wear into each other for 200k+ miles…and still SEAL properly. Much like a valve seals/wears in a cylinder head.
The 6.0L ‘spool valve’ is more similar to a piston in a cylinder bore…without piston rings…so when the spool gets worn (undersized), or its’ bore gets worn oversized…the spool can (& will) get cocked sideways within its’ bore…and will hang and stick…and not fire consistently. We regularly replace 6.0L fuel injectors with new (not remans), around 100-135k miles, due to the spool valve wear causing erratic/inconsistent firing, etc.
80-90% of the FICM’s we’ve sold have been the 58v version.