High exhaust manifold pressure.

[Rawze]

On those Komatsu's, Looking at the the programming for the exhaust pressure sensor ...


== It will set a default feedback value of exactly (170.0 kpa) / 24.6564 psi if there is any kind of fault with the sensor. The screen pic you posted there shows exactly this value, meaning it has resorted to only displaying only its bogus default value. The ecm does this if the actual feedback is out of bounds, and it can read this if the feedback signal is ...

-> shorted to POWER
-> shorted to GROUND
-> if it is unplugged (OPEN CIRCUIT) ... which is also seen as shorted to +Power.

I.E.> With regards to the signal reading itself ... Any of those conditions, and it will read that same default value, so this does not indicate at all that it is getting an external voltage, but rather that the actual signal is currently being ignored.

==========

Fault code 2373 is a little more specific, but not by much...

FC2373 is saying what is wrong with the sensor is that it is shorted to +power, and nothing more. This does not mean that it is actually shorted to +power though. ALL if the engine sensors, if you simply unplug them, the input signal will either go to +power, or -ground. The bulk of them, set for +power... and this is set in the programming, via the 'pull-up-resistor' options for each input pin of the ecm, and to prevent static electricity buildup on the pin, damaging its input.

I.E.> FC2373 is telling you that its either unplugged (open circuit) ... OR... it can actually be shorted to +power (+5 volts). The ECM does not actually know.

so .. we know from the pic you took that ...

>> The sensor has failed, and is only showing its default garbage value.

>> It either open circuit (unplugged, bad wire, etc.) , or shorted to +voltage somewhere. Its 80% more likely to be an open circuit rather than actually shorted to power, but one never knows. It can also be a missing ground connection to the sensor itself, and this makes have full +voltage to the feedback pin too.

some rough guesses..


** Maybe the sensor itself is bad / intermittent. Make sure that you only use certified OEM sensors.. as those chineezium and fleay-bay and Dorman garbage sensors are known to have issues.


** Maybe one of the pins in the plug itself is not making good connection to the sensor, either the ground pin, or the feedback pin.

** Maybe a broken wire for either the ground or the feedback pin between the ecm and he sensor itself.

** Maybe a bent pin on the ECM face connector.

And far less likely.. -> an actual short to +power in the wiring harness of the feedback signal wire itself somewhere ... but far more likely to be a short inside the sensor itself, or an open wire, as any condition of 'open circuit' will cause a fault 2373.


>>> Go unplug the sensor and see what it reads on the screen.