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Sometimes the 2005-2007 trucks develop EGR problems that you can see with software (the valve can't be commanded through its full range of travel) yet it won't set a CEL. The symptoms for that tend to be terrible acceleration off the line but seemingly normal power at higher rpms. Since it's at...

There's a couple air switches under the truck, but only one is a brake switch. The other brake switch is in front of the brake pedal. The inputs of these brake switches both have to correlate.

It looks like water intrusion causing corrosion.

Are any warning lights on, like the ABS or check engine light?

I'd take that cover off, disconnect the connectors, and blow everybody thoroughly compressed air. Make sure all five clips on the cover engage when you put it back on.

I know that's not the conclusion you wanted, but I'm glad the problem is solved.

Have you driven through rain recently? Water can get in the firewall junction box behind the engine air filter and cause communication errors with the transmission.

Those pressures are plausible. Is the cabin air filter present? If it's not, I'd suspect the evaporator fins are clogged.

With the truck cooled off some, take off the cap and start the engine. Are bubbles coming out of the radiator neck?

On Hinos, it's almost always always combustion gases in the coolant, or external leakage. They rarely mix fluids. If you're getting transmission fluid into the coolant, then it's coming from the transmission cooler inside the lower tank of the radiator.

There isn't a separate lift pump (unless you are referencing the hand primer pump)The high pressure fuel pump has two pumps stacked together. I'm suggesting the elimination of the entire fuel supply system and connecting an auxiliary fuel supply directly to the pump.

If transmission fluid is in the coolant it can only come from the transmission cooler inside the radiator., or someone poured it into the radiator.

It's not a normal failure at all. I don't think I've ever seen this failure on a Hino

It's a radiator failure, but if coolant has made it into the transmission fluid that's a big issue.

There is a definite link between the ABS light and transmission failure. When the ABS light is on , the torque converter unlocks. An unintended consequence was the fluid got much hotter and it overwhelms the trans cooler. I've looked at the circuit on a wiring diagram and found the one wire to...

Has this engine had an inframe? Can you describe the amount of blow-by that comes out of it when hot? Generally speaking, an engine that makes it to a million is getting pretty close to inframe time if it hasn't been done already.

First, disconnect any eld or GPS or any other aftermarket device that taps into the CAN. This has sent me barking up the wrong tree more times than I care to admit. You may need to do some digging to find devices that were hidden well to prevent tampering. Second, I would try replacing the...

Hi Alex2. Are there any warning lights on? Have you had the truck checked for codes? There are countless reasons for low power. To access engine, DCU, BCU, VCS codes, an appropriate scan tool must be connected to the 16 pin connector. Not all scan tools work on Hino engines. To access...

The Allison TCMs are failure prone, but it's also common to get water in the junction box behind the air filter. The CAN wires get water on them and it interferes with communication between the TCM and the rest of the truck

If there are communication issues, it could be caused by water intrusion in the junction box, located in the firewall directly behind the air filter. In particular, the large connector to the lower left. The red and white twisted pairs at the top of the connector commonly gets water on them and...