D40 YD25 Limp Mode

[Ashneel Sharan]

I got limp mode in my 2007 Nissan d40 (YD25). After switching it off and on again, the problem goes away.
However, on-off doesn't help always. It pops the engine check which corresponds to P0093 code.

I have changed the SCV and fuel filter, still the problem not solved. I tried to do paddle dance to reset the sensor but was not successful. However, I removed the battery terminal for 24 hours and it helped.

Other thing is if the fuel is low (fuel light on), then the limp mode is more frequent. After filling up, the limp mode goes away.

Today I used injector cleaner and also cleaned MAF sensor (extremely dirty). Its two days now, the limp mode is not activated yet.

Is there any other things to consider before changing the fuel pump and injectors?

 

[Old.Tony]

You could try pressurizing the fuel system (pump the primer like mad) until it starts leaking fuel. Being a 2007 model it will surely have hoses that, like mine were, starting to show signs of age. It might just be the hoses (or the primer itself).

 

[australianoz]

You might have a bad Fuel Pressure Sensor, found on the end of the common rail. This fault code is bad pressure code. At idle it may supply the correct signal voltage and once you rev it goes nuts. If you have a digital mutlimeter (an oscilloscope is better) you can "sort of" check the output voltage on the middle pin. Note that this sensor is powered at 5V! Each side of the signal pin you have +5V and GND. Unplugged you can check the signal pin output, supply the 5V and GND, reading should be a stable 1 to 1.15V. When plugged, at idle you should get something like 1.15 to 1.5 volts, reving to 2000 rpm it should rise to about 1.5 to 2.5 volts (will depend on the sensor which Nissan has many variants of on the YD25 over the years)... and yes you need to punch the tips thru the insulation to reach the wires obviously, so you need needle tips. Or maybe just change it, get a used one to eliminate any questions about that end of the circuit, they're relatively cheap.

 

[Heath Robertson]

You might have a bad Fuel Pressure Sensor, found on the end of the common rail. This fault code is bad pressure code. At idle it may supply the correct signal voltage and once you rev it goes nuts. If you have a digital mutlimeter (an oscilloscope is better) you can "sort of" check the output voltage on the middle pin. Note that this sensor is powered at 5V! Each side of the signal pin you have +5V and GND. Unplugged you can check the signal pin output, supply the 5V and GND, reading should be a stable 1 to 1.15V. When plugged, at idle you should get something like 1.15 to 1.5 volts, reving to 2000 rpm it should rise to about 1.5 to 2.5 volts (will depend on the sensor which Nissan has many variants of on the YD25 over the years)... and yes you need to punch the tips thru the insulation to reach the wires obviously, so you need needle tips. Or maybe just change it, get a used one to eliminate any questions about that end of the circuit, they're relatively cheap.

Great response. My 07 d40 had same fault and so I purchased a frps. The sensor did not resolve the issue. It ended up relating to a loose connection on the frps plug. But that connection resulted in a voltage drop and the system thinking had a fuel leak. So check the connection pins etc too....