after all the talk about the idm mod i decided to do some research on the factory numbers since nobody has gotton an exact number.

straight form the manual for the 97's -
Injector Driver Module (IDM)

****** content="Injector Driver Module (IDM)" name="tps_proctitle"> Diesel Engine
The injector driver module (IDM) supplies 115V DC to all of the fuel injectors.
The injector driver module (IDM) receives signals from the powertrain control module (PCM) (12A650) for cylinder identification and fuel delivery command signal (FDCS). The powertrain control module controls when the timing of the injectors should start and how long the injector is open.
The IDM controls the injector firing sequence through output drivers. The IDM has an output driver for each injector: one low side driver for each injector and one high side driver for each bank of injectors. The injector is fired when the output driver closes the circuit to ground, completing the circuit ground path.



straight from the pc/ed for a 2002-
Injector Driver Module
The solenoid-operated poppet valve requires 115 volts at up to 8 amps to operate, which is more power than the PCM can supply. Therefore, a high power device, the Injector Driver Module, is used to supply power to the solenoid on command from the PCM.

 

whats it mean joe?

 

the newer manual isnt very specific as far as the idm output but the obs book shows a defiate number of 115volt. all the numbers i have been told was that the obs idm puts out alot less, so the manual gives us an exact number.... doesnt really mean much, just info to share.

 

Kinda funny the manual says 115 when there is a IDM 100, 110 and 120. Those numbers represent the voltages.

 

...Confirmed by the guys actually working on the IDM's. I'd take the hands-on guys' word before the manual, so I'm not sure what the book is trying to say...

 

The manual might be a baseline. If the IDM Communicates with the PCM, then it might know the voltage that is suppose to return. *shrugs*
I imagine that the voltage doesn't really matter though, just the completion of the circuit.

Unless the higher voltage is being generated for a reason, noise or what not, the voltage shouldn't matter between 100-120. Hell, it seems excessive to me unless its a cellinoid firing. But PSD injectors are Oil Fired right? Well duh, HPOP.
High voltage release to allow high pressure oil?

 

Yes fired by oil but the Electrical side (IDM and Injector solenoid) open the poppet valve to allow the HP oil to flow. Higher voltage means a faster solenoid thus the IDM mod to bring voltages up to 140volts.

 

That's exactly what I was thinking.

Wont the higher voltages give the possibility of arcing? or are the wiring harnesses pretty well shielded for that stuff?

 

This is another info to share:
7.3 Power Stroke IDM

 

Joe Servo is the Man!!!

Bill

 

Not much of an issue. Its relatively high voltage but not very many Amps.

 

more than enough to kill you, might as well stick your finger in a household outlet..... 8 amps is alot at that voltage.