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I get the impression that the CPS integrates with the VP44 calculations. I also think that the CPS signals are involved with telling the ECM what to do with the LP (start voltage or run voltage).
When my VP44 threw 0216's the conditions were very high rpm conditions (3000 rpm +), and "normal" engine temperature (fully up to operating temperature). In DC's "repair" scheme, they "fixed" (replaced) the lp first, then "fixed" (replaced) the CPS second, before "fixing" (replacing) the VP44 (a Jan 2002 VP44).
I think DC does a corporate cost effective (and I do not mean correct) RnR approach to "repair", not necessarily a customer satisfaction approach to repair. That said I think if the CPS is in the DC list of "things to do", then I would certainly replace the CPS just because it is a relatively innexpensive part (as compared to a VP44) and directly inputs to the VP44.
my .02
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02 3500 ETC,4.10,DD2,SMARTY,HTB2,ATS man,Rip's4",Scotty II,89 DTT,H7B ETC cooler,VP fuel temp,VP fuel coolers,VP OAT blower,Draw Straw,Kinsler JET CAN,RACOR 690,LFS-802,RASP #1lp,Walbro 392 #2lp,Speed Bleeders,SmarTire,CentraMatics,AUX bed tank,Williams Controls APPS with MicroSwitch IVS
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