Engine check code questions

[kketterling]

I have a C9S01083 engine in my coach and twice last year about 6,000 miles apart I got this code: SPN 157 FMI17 - Engine Injector Meter Rail 1 Pressure Low Least Severe (1) When I turn engine off code clears.


I changed fuel filters and haven't driven it much at all this year but thinking of changing pressure sensor as well. On the CAT parts site they listed this sensor part #293-5535. Can anyone tell if this is the correct sensor that monitors fuel rail pressure? And if so would you have a diagram as to where on engine it is.


Thanks

[kketterling]

Found location of pressure sensor and will double check my engine to verify. used this youtube video:

https://www.youtube.com/watch?v=Bn33Jf0wWY4

Now I'm wondering if I should change pressure regulator as well sensor. Any thoughts appreciated.

[Cat]

Be very careful when working on the common rail fuel system. The system can be contaminated by using brake clean or starting fluid to clean out sensors lines going to the fuel rail.That's right there is enough contaminates those cleaning fluids can ruin a injector or injectors. The steel lines going to the rail and from the rail to the injectors can not be reused. Once removed they are to be replaced. The pressures are 30,000psi.They are very very sensitive to any contaminates.
Yes it is possible the rail relief is leaking. This valve is only used as a emergency relief. The ECM and the pump controls the tiny check valves to control pressures.Good Luck