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Go to the engine menu-data monitor and active test-active test settings, scroll down and you'll find it.

No, there is no engine oil pressure sensor, just a switch for the low oil pressure light.

You don't need to prefill it. Just bolt in on, start the engine, shut it off, and check fluid level in ps reservoir.

Yes, power steering fluid will come out. Just top it off when you're done. It takes dexron III.

Sounds like the hydrovac is leaking. Put 12v on the aux motor and see if it turns on.

5000? That can't possibly be right. When it first starts up it'll be higher until it warms up, then it'll idle at 750.

The atomizer is the actual module, not the burner nozzle. If you're getting this code, the atomizer should be replaced.

It is normal for those to do a regen every 100 or so miles. You're within the normal range. Do you ever have to do a manual regen? If you do, how long do they take?

I have seen this failure numerous times with the 3126 and C7.

Update: water can get into the firewall junction box from a leaking windshield seal. If it gets into the CAN wiring, all sorts of weird things happen. The junction box needs to be opened up and inspected for water.

I don't know if they're the same or not. There was a big step up in emissions stuff between those years. The VNT controller is calibrated to the turbo at the factory, so swapping controllers often doesn't work correctly.

Unfortunately Hino doesn't give out much oscilloscope data, so I can't help you there. It definitely sounds like a low fuel pressure issue, and you've already checked the rail pressure limiter.

I think you're going to need to have it scanned to check for codes. Aisin transmission?

When the filter is new, fuel will be at the bottom of the filter. As the filter gets clogged, the fuel level will rise in the filter housing. Does the check engine light come on when it has low power? There can be many reasons for low power. Many different faults can cause limp mode, which...

I would fire it up and wiggle and shake every bit of wiring you can get your hands on.

Hino won't be able to do anything with the TCM, you need to go to an Allison dealer.

The replacement TCM might be good, but they use that computer on all the different Allison transmissions of that era, so there's no telling what programming is on it.

I guess you know by now, but no one should ever shotgun parts at one of these things. Get an actual diagnosis first.

Generally when E shows up on the shifter, the TCM has failed. They have a high failure rate. I can look at this a little deeper but until a known good TCM with the correct programming is installed, all bets are off.

Probably the most common failure mode that triggers P2436 is burner nozzle pressure dropping to the correct level after a regen. The nozzle pressure at rest is supposed to be 0.5-8 psi at this step. They will get stuck at much higher pressures (40-50psi) for too long a period and the light...