Hi there I recently purchase a new Hino 268 with automatic transmission, its a 2015 just picked up yesterday. New to this whole exhaust brake thing. Dealership told me to leave the exhaust brake on? I check online and getting mixed review. I checked the owner manual saying how to use the exhanust brake
The exhaust brake enhances the normal engine braking effect and helps reduce foot brake applications. Use it when driving down a steep or long grade with heavy loads or when slowing down from high speed.
While driving with the exhaust brake, exhaust braking will be temporarily cancelled automatically in the following situations
-when the clutch pedal is depressed
-when transmission is in neutral position after shifting
-when abs is turned on
-when engine speed decreases to less than 755 rpm, the exhaust brake will turn off automatically, even if the exhaust brake switch has been activated
also to warm up system in the owner manual
this system is used when you want to heater and defroster to work as soon as possible after starting the engine in cold weather, or you want to increase efficiency of heater while the vehicle is stopped for a long period of time.
1. apply the parking brake firmly and place gearshift lever to P
2. start the engine and lower the exhaust brake switch lever
will this increase the warm up time engine needs?
Also should I use exhaust brake on snow or rain?
Does it damage the engine if i start the truck with exhaust brake on?
dealership also told me how to do def regren if it flash amber :/ hope that doesn't happen...
thanks
Hi there.
Generally speaking, we tell people to leave the exhaust brake off when you are driving unless you need it, as it has disrupted the auto regen process. This is less of an issue now that lots of computer reprogramming has been done. The 2015 should be largely unaffected by this because it uses a different dpf heating system.
Yes, it will force a quick warm up. It will use about twice the fuel at idle doing this, so unless you're thawing it out on a frigid morning, I'd avoid leaving it on longer than necessary.
I would avoid using the exhaust brake in snow or heavy rain. Since there is no connection with the antilock brakes, if you manage to get into a skid the results will be scary.
The ecu won't allow the exhaust brake to activate during engine cranking. Nothing to worry about there.
What the dealer didn't tell you : There's a graph on the dash labeled DPR. When it hits 3 bars, it will automatically regen while you are driving, and you won't even notice. If you come to a complete stop during this process, an amber warning in the dash will light up, saying "regeneration in progress". What this really should have said is "exhaust is hot". Basically, don't park in dry grass when that warning is up, because it WILL set stuff on fire. You can totally catch cardboard on fire if you hold it in front of the exhaust during a regen.
Any time the DPR graph is at 3 bars or higher, you can push the regen button on the dash and it will do a manual regen. Don't disturb it while it's doing this unless you have to. It won't take very long.
If the bars on the dash hit 5, the regen light on the dash will start flashing, and a voice will tell you that a manual regen is required.
If you ignore all the warnings and drive it until the thing hits ten bars, you are going to damage the dpf. It will melt.
Really though, the 2015 auto regen cycle is very fast and you should have no problems out of it for a long time.
Is this a box truck? Or is it something like a rollback, paper shredder, or a garbage truck? Sometimes some trucks in applications like this that have a ton of idle time have problems doing regens, but there are some things that can be customized in the computer to give greater flexibility.
Finally, change the fuel filter at least every 10k miles, despite what anyone tells you. Use either Hino or Fleetgard EleMax filters. The fuel filter has to have very fine filter media or water particles will pass through the filter and damage the injectors. Don't use fuel additives, unless it's an emergency and you need antigel protection. Many fuel additives will disperse water, which sounds good but all that means is it gets emulsified in the fuel, passes through the fuel filter media, and damages the injectors.
