2016 Pierce Engine Exhaust After Treatment Systems

Question 1

________ will trap particulate matter or soot and ash while the engine is running.

Answer 1

Diesel particulate filter

Question 2

Passive Regeneration

Answer 2

Can occur during normal engine operation, typically at higher speeds and/or high loads. Exhaust temp gets high enough to burn off soot without driver intervention.

Question 3

Active Regeneration

Answer 3

Removes collected soot in the diesel particulate filter (dpf) by injecting small amount of diesel fuel into exhaust stream to raise exhaust temp.

Driver can initiate by changing the duty cycle or manually initiate by using the regen switch while parked.

Question 4

Auto active regeneration during driving

Answer 4

Automatically activate if:

• Dpf light illuminates and looks for opportunities
• Sufficient exhaust flow and temp conditions
• speedometer showing 5mph or higher

Question 5

Parked regen RPM

Answer 5

900

Question 6

Steps to perform a parked regen?

Answer 6

1. Dpf lamp must be on or flashing.
2. Stop in safe location.
3. Set parking brake.
4. Set safe zone around exhaust. (5ft of any items)
5. Foot off throttle and brake.
6. Hold regen switch for 5 seconds.
7. Stay with rig. Monitor the area.

Question 7

Regeneration can take up to how long depending on soot level?

Answer 7

20-40 mins

Question 8

Exhaust temps stay high for how long after regen completion?

Answer 8

At least 3-5 minutes

Question 9

After regen completion, the HEST light will remain on until exhaust outlet temp is below ___ or the vehicle speed exceeds ___?

Answer 9

977 degrees F

5 mph