Accord fuel rail pressure

[vtrek7]

Hello,

I have an Accord 2004 2.2 cdti. The problem is that sometimes it stalls (when idling for a few minutes, sometimes it stalls even when driving). But the biggest problem is that sometimes it does not start when cranking. Also after a while it started from first try (overnight), but now it does not. I have changed the battery, fuel pressure valve (which is on the passenger side), checked the injectors. I used ThinkDiag OBD2 tool to check for DTC's. It showed P1062 – Fuel rail pressure (FRP) sensor circuit high voltage after ignition on. I bought an aftermarket (Maxgear) FRP sensor and replaced with my old one, but it did not help and I got a DTC for fuel pressure valve (somehow), so I replaced back with my old OEM one (Bosch). To check what's going on I wanted to check what's the fuel pressure and I was surprised that my fuel rail pressure was ~122 MPA, when target is ~57MPA (FRP sensor voltage 3.28V) I can attach pics of it below. I disconnected the sensor and recorded data: Fuel rail pressure was 179.25 MPA and target was 29.17 MPA. (FRP sensor voltage 5.10V).
First pic is with connected sensor and second is with disconnected.


Also I need to mention that sometimes after the ride when I stop and am idling for a while, the battery indicator shows up in a dash for a few seconds and then disappears. Maybe my problem is related with wiring or alternator..

If anyone has any ideas or had similar situation, please share.

Thanks.

 

[F6HAD]

It’s the pressure relief valve on the drivers side that you need to change most likely.

 

[vtrek7]

It’s the pressure relief valve on the drivers side that you need to change most likely.

It was replaced already on the passenger side, car is left-hand drive.

 

[F6HAD]

Then I would suggest a fuel pressure leak off test, possibly a bad injector. Your battery indicator problem is likely an additional problem, either a bad battery, alternator or maybe a corroded earth strap

 

[vtrek7]

Ok, so I think I found a solution to my problem.

Firstly, I disconnected the fuel pressure regulator that sits on the Bosch fuel pump (two pin connector) and tested the fuel pressure - it did not change at all and was still 120MPA. After that I ordered new one, not OEM, but aftermarket (NTY) that costs like 35 euros. Then I plugged out the whole thing, just unscrewed 3 torx screws. I was surprised that I saw, that somehow the top of the sensor is damaged. Photos below.


Then I got the new one, and after installation I checked the fuel pressure and it was normal (not too high like before). Furthermore, I deleted the old fault codes and after a bit of cranking the car started. I drove it for a while and no faults.

Maybe it will help someone in the future.