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Because most shops pay flat rate, which means time=money, and it's faster than doing it correctly.

I changed my vote to yes.

Did the ABS warning light come on during this time? Did you ever replace the small spin-on filter in this two-year period? What were you refilling it with (since it was leaking)? If the ABS light came on during this time, the torque converter will unlock and the transmission quickly...

I don't like throwing parts at trucks until I prove the old ones are bad first. That's why I'm not telling you exactly what to replace.

That relay is basically a big Bosch relay. You don't have a terminal 87a, so just ignore that. 85 and 86 are the signal. 30 should be hot, and when the relay energizes, power flows to 87, then out to the motor. With the ignition on, engine off, there should be power at 86 and 30.

I have been working with another forum member via pm. This is exactly the same thing he was experiencing. The fuel pump was replaced, all of the flow dampeners disassembled and cleaned, and the rail itself was scrubbed out with a bore brush. This finally solved his problems.

Ok, this is why the warning light is on. Check that motor and the big relay next to it for proper function.

For this, yes. For sensor testing on the engine, you need a multimeter. I use a Fluke 88V. Does the aux brake motor come on when the ignition is turned on?

First, figure out which of these two is closed. Backprobe both connectors with the engine running at idle. Probe one wire at a time with the other lead on your meter attached to ground. Only one leg on each switch should have power.

Skip back about three pages ago, I explained it in detail. And this is unrelated to the brake warning light. There's a switch on the master cylinder and one on top of the hydrovac that can turn on this light. This system is very common on multiple brands of trucks, not exclusive to Hino.

Second.

Did you test the fuel level sensor?

Check the brake fluid and power steering fluid levels. That's a warning for low hydroboost flow and/or improper master cylinder stroke.

Sounds like a blend door issue if you have both heat and ac at the same time. This could also cause poor airflow.

Pull the fittings out of the filter head and look for debris. May also want to pull the supply elbow out of the tank and look for debris there. This is an exceedingly common problem. I'd be very wary of any attempt to pressurize the fuel system to aid filter priming. Im mostly referring to the...

I haven't looked it up, but I doubt it.

If the filters have been left off for any period of time, the evaporator fins might just be clogged full of crap. If enough soda and coffee have been spilled, the sugar will seize up the blend doors. You'll know if the blower motor itself is going bad when the speed control switch and harness...

Generally not. Unless there's a section of harness that's not plugged in all the way.

If the abs light turns on again, hit the button before it turns off. If there is still no code, then the ABS computer is probably losing power or ground connection. For the fuel level sensor, pull it out of the tank and put a multimeter across the legs. You're checking for a smooth change in...

I can't condemn these things without testing them first. What year is your truck again? near the data link connector, there may be a button marked ABS. press it and retrieve the flash codes.