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It has likely scuffed a piston, which would require a rebuild. Leaking injectors and overheating can cause this. Edit: Get a compression test done.

Without knowing which diagnostic codes are being set, this will be difficult to diagnose. The parts are too expensive for me to rattle off a list of things to try.

You have two different problems. For the blower motor, it is very often the switch that has burnt up. The wires going to the switch, and the switch's connector melt. Repair parts are available. Replace the blower motor at the same time, because when they age they start pulling more current...

They aren't repairable. Get a new one.

Any restriction in the fuel supply will cause this code. If you had access to dealer software, you could look at historic fuel temperature, and temperatures above 200f suggest the pump has high internal leakage. I would be more quick to blame the pump rather than the injectors. But first the...

God I hate the Cat C7.

Nope.

Brake switch misadjustment or failure is the most common cause of cruise control problems, but I don't know if Australian trucks are similar to US.

I've never heard of this problem with a TICS pump. Make 100% sure there's an uninterrupted, air-free fuel supply to the engine. Make sure the shutoff cable isn't pulling the lever at all in the run position. There may be a governor fault or a sticking fuel rack or something, but I can't...

P0741 indicates a slipping torque converter clutch. Replacing the transmission is a viable repair. You might get lucky with just a torque converter, but without a lot of testing you won't know if the torque converter is at fault, or if the fault is in the transmission.

Are you using the idle knob to control pto speed? If so, it needs to be reconfigured. The ecu needs to see that the PTO is engaged, and there are pto inputs available to do this.

I'd need to hook a computer up to it.

I think you should have a compression test done before spending money on parts.

These engines are not sleeved, and they have brittle rings that like to break and tear up the cylinder walls. A rebuild of this nature will probably be out-of-frame and will require sleeving of the block. There's a dead one in my yard. I got a quote for $11k to rebuild it correctly.

I had learned about this in class, and promptly forgot about it. So technically yes, I learned something. And that's not fair of me to claim. I've learned a ton by working with everyone on here. I've learned a lot about streamlining the troubleshooting process, since the truck isn't in front...

https://i.imgur.com/L1tLE8k.png

Another forum member sent me this picture. You might want to inspect the lift pump. Keep in mind that none of the parts pictured are available separately from Hino.

Sometimes a spring in the pump outlet fails, and bits of it clog the flow dampers in the rail, causing a misfire. I doubt this is your case, though.

Is there an obstruction at the pump inlet? It's sounding like the pump has failed somehow.

That sounds like a nightmare. Good job figuring it out.