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Thanks for the detailed reply. The fuel pressure relief valve is on the lh side of the common rail to the lh of all the flow dampers. It has a 14mm banjo bolt in and connects the fuel return line. There is a bulletin to drill the 3 holes in the intake throttle valve. Give me your email and I can...

First off thanks for the good info and welcome. You don’t say what kind of debris was found in the common rail. Was it metal or dirt? We have seen fuel pump failures causing metal to lodge in the dampers. In almost 15 years of working on Hino’s I have replaced 2 maybe 3 flow dampers and they...

Can you tighten the wire on the starter, start it then get it to a place that can give you codes? Is this unit a 2012? What 30 amp fuse are you pulling? You have a lot going on here. Let’s start out simple. Can you tell us what codes it has and confirm the year of the truck. 2012 trucks do not...

Pictures would help. Did you get it going yet?

Let’s back up. All of this started happening after you replaced the batteries. I suspect either someone jumpstartes the truck by connecting the leads backwards & blew a fuse. Or there is a connection not connected. The picture of the batteries looks good however… the connection on the positive...

Can you post a picture of the battery connections?

Do you have source battery voltage on both sides of the 100a and 80a maxi fuses? This would indicate you are getting power to & through the fuses.

Beeep beeep beeep sounds like a derate from the SCR. Are there any lights on or flashing in the cluster? Sounds like loss of power to the DCU. Pay close attention to corrosion in the smaller ring terminal connections on the power side. One of these feeds 12v to the DCU (SCR computer)

Multiple manufacturers are having supply issues with genuine Nox sensors. We sell aftermarket ones “dinex” to people when we can’t get OEM. In a nutshell they are junk. They cause datalink issues and fail in strange ways causing weird isssue. I would get genuine only. Just my 2 cents.

DO make sure the key is off when removing fuses or it can set fault codes.

You don’t have to remove battery connections to remove fuses. Unless you are removing the high amperage fuses. Some of the large amperage fuses have constant battery power on them so you will need to be careful as some of them are held on with bolts. Anything in the cab relay/fuse center would...

Welcome. First rule of hino is check EVERY fuse. Start in the fuse relay center in the cab. Then check the fuses in the external relay box above the batteries…& there is also another external fuseable link box to the side of the air filter housing. The larger amperage fuses have a clear cover...

This guy has posts all over the internet on this truck. Seems like he just wants you to use your crystal ball to fix it for him. If he would answer the questions and do some of the visual inspections we could probably come up with a solid solution IMHO. I have seen this issue before on a truck...

I sent a pm, but for the record. P204F is only telling you you have an issue with the SCR system. It is a generic code, it does not tell you anything else. There are over 50+ specific codes that relate to what the issue is. Posting any and all codes will generate a specific diagnostic repair...

Just re-read your post. Do you have any soot or exhaust leaks. Where is the hissing sound coming from. Is it more notable with the exhaust brake on?

I have only ever seen one fail…. In the 11 years that valve has been in use. P0402 is for high egr flow. Essentially the engine ecu has an algorithm/ calculation which judges theoretical egr flow and actual egr differ. If these two do not correlate for over 30 seconds it sets the P0402 code. It...

I wonder if the DPR pushed. Sometimes the DPR will push into the DOC. Have not seen it in a while, but it does happen. Genuine Hino DPR’s have a ring welded on the back, to prevent the DPR from pushing into the DOC. Hopefully it’s just a broken sensor ( never seen one break there without...

I posted the part number and the price last week above. Here it is again though 89425e0310

89425e0310 There are plenty available. $60-70 ish.

Also is that a non genuine DPR? They usually do not have exposed welds and there should be a heat shield there. Just curious