Why am I supposed to press the clutch all the way to the floor before I do a regen?

Hmmm. I find on my DD15 I only have to push on the clutch enough for the switch to activate, so something close to a normal push.
All the other stuff is just to make sure that you know, and the esm knows that the truck is in neutral, parked, parking brake set and ready to do it's thing.
I have the ECM Auto Elevate parameter set, so if the truck is already parked on fast idle, it will just automatically do a parked regen on it's own accord without any input from me. I don't normally idle the truck overnight, except when it's below -30. So if at 4:00 am it decides it needs a regen, it just goes ahead and does one instead of setting off alarms, making me get out of bed.

 

That seems unnecessary to me. I think they are trying to avoid a sticky pedal from inhibiting a regen and making sure it is up all the way.

 

Yeah, that's what I'm thinking, although all the regens I've done were on Cummins and PACCAR engines, and those were all forced regens (with the engine software). I don't necessarily know the parked regen procedures for all engine makes if they vary significantly.

 

These are the steps that are in the manual for my DD16
1. Keep engine at slow idle (cannot be in PTO mode).
2.Cycle transmission out of neutral and back into neutral.*
3. Cycle the park brake from OFF to ON.*
4. Press and release clutch pedal.*
5. Hold DPF Switch to the ON position for five seconds, then release. Engine speed will increase and DPF Lamp will go out.

*These steps are not required on GHG14 engines or later.

I'm glad that I dont have to do steps 2 thru 4.

I'm going to stop at a Detroit shop and have that turned on, it sucks getting woke up in the morning with the Regen alarm going off.

 

I don't do any of that on my Cummins or Detroit. As long as it is idling with the parking brake on, just push the regen switch and away it goes.

 

When I have to start doing all those steps, here will be my regen procedure.......fill 5 gallon can with gas. Slide under truck. Insert rag in opening of can. Light rag on fire with lighter, then go for a long walk.

 

Where is the regen switch located in my 1978 Kenworth W900A?

 

Pushing the clutch all the way to the floor activates the clutch brake which stops the transmission from turning. Not sure what that has to do with a regen but that's what happens.

 

Most likely because the ECM senses the clutch/input shaft is still rotating until it is manually stopped...