How To Check Your FICM For Proper Voltage Output

Perform this check when the engine is completely cold

  1. Remove the two bolts that hold the coolant reservoir to the cowl and push the reservoir out of the way forward and to your right. You do not need to disconnect any of the hoses.
  2. On top of the FICM is a small cover held on by two #20 Torx screws; remove these two screws and pry the cover off.
  3. On 2003 and early 2004 trucks, you will see 7 screw heads under the cover. On 2004 and later trucks you will see 4 screws.

PROCEDURE for 4 SCREW FICM

  1. Take a multi-meter set on DC volts and connect the ground lead to battery negative, and with the key ON measure the voltage at the screw on your right—closest to the driver’s side fender. Do not let the probe short against the case! The voltage should be right at 48 volts. Anything between 47 and 49 is good.
  2. Have an assistant cycle the key and measure the voltage during the initial key-on buzz test. Voltage should not drop below 46 volts.
  3. Next measure the voltage while cranking the engine. If voltage stays at or above 45-46 volts, the FICM is fine. Abnormally low battery voltage can give a false low FICM voltage reading, so make sure your batteries are good.

The procedure is the same for FICM’s with 7 screws, except that you will be checking voltage at a different screw, as shown in this picture.

PROCEDURE for 7 SCREW FICM

  1. Repeat step 1 above ( multi meter step) but put the positive lead on the left-most screw in the row of 4 screws. Do not let the probe short against the case!
  2. Same as 2 above
  3. Same as 3 above
If the voltage is above 46 volts in all the tests, your FICM is in excellent condition.
Part #: 921-122

2003 - 9-22-03 F-Super Duty and Excursion, Ford 6.0L Power Stroke Fuel Injection Control Modules (FICM). The Fuel Injection Control Modules (FICM) controls the fuel injectors on the 6.0L engine. It is responsible for stepping up the battery voltage to 48 volts, which is required to activate the injectors.
Price: $324.99
Core Price: $175.00 Quantity:


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Part #: 921-123

9-22-03 - 2004 F-Super Duty and 9-22-03 to 01-22-05 Excursion Ford 6.0L Power Stroke Fuel Injection Control Modules (FICM). The Fuel Injection Control Modules (FICM) controls the fuel injectors on the 6.0L engine. It is responsible for stepping up the battery voltage to 48 volts, which is required to activate the injectors.
Price: $324.99
Core Price: $175.00 Quantity:


Free Ground Domestic Shipping On This Item
Part #: 921-124

2005 - 2007 F-Super Duty, Jan 2005 - 2006 Excursion and 09-22-03 - 2009 E-Series, Ford 6.0L Power Stroke Fuel Injection Control Modules (FICM)
Price: $324.99
Core Price: $175.00 Quantity:


Free Ground Domestic Shipping On This Item