Alright so I have had my truck for a total of 2 days now and the dreaded check engine light came on so I did the little key trick to see the codes.

heres what i got:
P01693 and P0237

Does this mean my IP is going out or the LP or what? How can I check. I havent been able to get a fuel pressure gauge yet. Is there a schrader (sp?) valve somewhere on the fuel system to read the pressure that way or what?
According to the FAQ, p0237 is low boost pressure, but my boost gauge seems to be reading at normal levels.

 

P1693 is a PCU code letting you know that there is a code in the ECU
P0237 is an ECU code - MAP sensor voltage too low.

 

thanks, What is the best service manual for these and where is the best place to get one?

 

Factory Service Manual.... IMO.... I bought mine off of ebay for $10.

 

alright checked the fuel pressure and it was about 14psi at idle then drops to about 10 at somewhat WOT, so im guessing it is not the IP or LP. Must just be the MAP sensor that threw the 237 code

 

the code is turbo charger boost sensor a circut low . i would check all grounds

 

oh yeah 1693 is just a companion code