07 XC90 3.2 fuel rail sensor causing code

vmaxmike · Post by **vmaxmike** » 01 May 2017, 16:13

Hi Forum,
I've had a CEL code for a couple years now (leak detection pump control circuit high - P2402 generic) that never bothered the way the engine runs so I've disregarded it. If I clear it, it will take a few days of driving to come back on. About a week ago there's been a second code - generic P0190 - indicating fuel rail sensor circuit issue but again engine still starts and runs fine same as it always has. Just FYI, code coincidentally appeared about the same time that I changed the oil trap box because the PCV diaphragm developed a tear in it causing the usual symptoms (high whistling noise / high internal vacuum). Fuel filter was changed about 30K mikes ago. Is this an indication that the fuel pump is about to go? Are the two issues possibly related? Thanks!

vmaxmike · Post by **vmaxmike** » 01 May 2017, 16:16

Reply provided by Jimmy57 (THANKS Jimmy!)
The leakage detection pump code is usually due to the pump aging and the current to run it gets out of allowed range. Volvo has an upgrade for ECM that opens up the range but usually the pump winds up getting changed.

The code for fuel pressure you list is for high or low pressure. It might be pump but it can also be the fuel pressure sensor on the end of the fuel rail or even the PEM connector. The PEM is the transistor power stage the ECM commands to control fuel pump current to increase or decrease fuel flow based on reading the fuel pressure sensor. On that car the PEM is in the spare tire well area forward.