I'm trying to diagnose a sudden shut down. I got codes p0253, p0251, p1688, p1689, p0252. I could not find p1688 & p1689 in the Actron book. looks like a new pump may be in order...

LM

 

https://www.dieseltruckresource.com/...n&onlynewfaq=1

good link to keep handy

 

Fill out your sig. so we know what your working on! Not all the codes are listed in that link, but heres what I came up with......
P-0251 FUEL INJECTION PUMP MECHANICAL FAILURE FUEL VALVE FEEDBACK
CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
P-0253 FUEL INJECTION PUMP FUEL VALVE OPEN CIRCUIT . . . . . . . . . . . . . . . .224
P1688–INTERNAL FUEL INJECTION PUMP FAILURE .

no 252 or 1689 listed in the FSM

 

P1688–INTERNAL FUEL INJECTION PUMP FAILURE

This is the painful one....

 

thanks a ton

 

Do you have a fuel pressure guage?