IMPORTANT INFORMATION ABOUT THE 58V FICM MODIFICATION
To check the actual output voltage on a Grizzly 58V FICM, you must use a voltmeter. We implement a modification process that tells the PCM that 58 volts is actually 48 volts because the PCM would otherwise report an error code at 53 volts. In other words, with our modification the PCM sees 48 volts, the injectors see 58 volts. And since the scan tool communicates with the PCM to check voltage, you will only see 48 volts with a scan tool.
TO ACCURATELY CHECK THE OUTPUT VOLTAGE OF A 58V FICM WITH A VOLTMETER:
Remove the access cover on the back by removing the two T-20 screws
Carefully remove the access cover by gently prying the cover off of the module.
With access cover opening oriented to the left side, place the black lead on the top screw and the red lead on the bottom screw. Be very careful not to short the red lead to the module case. This could damage the FICM.
