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RGC A/O > 2016 Pierce Engine Exhaust After Treatment > Flashcards

2016 Pierce Engine Exhaust After Treatment Flashcards

1
Q

Beginning in 2007, these engines are equipped with varying specialized exhaust equipment designed to what?

A

Reduce Soot, Ash, & Nitrogen Oxide

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2
Q

What are two ways regeneration can occur?

A
  • Naturally: exhaust hot enough to burn the soot off

- Require Intervention: Engine ECU or operator intervention

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3
Q

What is the solution of the DEF, urea, or Ad-Blue?

A

Solution is 32.5% urea and deionized water

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4
Q

What does the Amber Check Engine/Engine Warning light indicate?

A

Non-Critical System Fault

Can drive to the end of their shift, call service to remedy the problem

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5
Q

What does the Red Stop Engine light indicate?

A

Serious engine fault may result
Vehicle shut down as soon as safe to do so
Remain shut down until serviced

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6
Q

What does the Malfunction Indicator (MIL) light indicate?

A

Fault has occurred on emission related component:

After treatment system should be diagnosed/serviced at next opportunity

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7
Q

What does the MIL & Stop Engine light together indicate?

A

Vehicle stopped soon as it is safe to do so, serviced

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8
Q

What does it mean when the Diesel Particulate Filter (DPF) is illumiated?

A

Regeneration is necessary

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9
Q

What does it mean when the DPF light is on solid?

A

Low to Medium levels of build up
Requires Regeneration

  • Ensure switch is not activated
  • Initiate by challenging duty cycle/highway driving for least 20 minutes or pumping
  • or perform parked regeneration
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10
Q

What does it mean when the DPF light is flashing?

A

Medium to High levels of build up
Requires regen ASAP

-Perform parked or more challenging duty cycle

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11
Q

What does it mean when there is a flashing DPF light flashing & Amber Check engine light on?

A

High Levels of build up
Regen required immediately

  • Auto regen will not initiate
  • MUST perform parked regen
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12
Q

What does it mean when there is flashing DPF light & Check engine light & RED Stop engine light?

A

If parked Regen not performed, Stop engine light will illuminate

-Should be stopped and remain shut down till serviced

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13
Q

What does it mean when there is a High Exhaust System Temperature (HEST) light on?

A

Active Regeneration has been initiated

  • Exhaust temps above normal
  • Will remain on till temps are below 977 F
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14
Q

What happens if the HEST light is ON and the vehicle speed has dropped below the threshold of 5 miles per hour?

A

Light will remain ON until speed increases -3 mph back above the speed threshold and regen process is finished

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15
Q

What is Passive Regeneration?

A

Occurs during normal engine operation, at higher engine speeds

  • Exhaust temps high enough to oxidize the soot in the DPF
  • No ECU or operator intervention required- see no difference in engine performance
  • No extra fuel used
  • Excessive exhaust temps dont occur
  • DPF light may temp illuminate & extinguish reach moderately high level, reduces soot load naturally
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16
Q

What is Active Regeneration?

A

Controlled by ECU

  • Removes collected soot by injecting small amount of fuel into exhaust stream
  • Raises exhaust temperatures to provide heat needed to burn off accumulated soot and regenerate the DPF
  • Regen can happen when truck being driven, stationary truck operations or pumping operations
17
Q

When does the need for active regeneration occur more frequently?

A

Within low speed
Low load or stop and go conditions

DPF lamp illuminates when regen is needed:
operator can can duty cycle and allow active regen or
manually park regen

18
Q

When will the system automatically activate a regeneration?

A

Speedometer showing above 5 mph or higher speed or pumping mode

19
Q

Warning about parked regeneration:

A
  • Causes high exhaust gas temperatures at zero mph
  • Do not perform in an enclosed are
  • Do not sit in parked vehicle with extended amount of time
  • Do not perform while connected to exhaust extraction system
  • If engine speed does not increase-contact cummins dealer
  • 900 rpm
  • does not need to be out of service to perform regen
20
Q

What are the ways to stop a regen process?

A

Pressing brake
Throttle
or
Regen Inhibit Switch

21
Q

When performing a regen, important info:

A
  • Normal idle (high idle should be OFF
  • Clear area 5 ft
  • If indoors, pipe exhaust should be rated at 1500 F
  • Keep foot of the throttle pedal and brake pedal
  • DPF lamp must be on in order to start
  • Regen takes 20-40 minutes or more
  • Exhaust temps stay high at leat 3-5 minutes after completion
22
Q

What is the Regeneration Inhibit Switch used for:

A

-Used to temporarily suspend an in process active regeneration
Ex: occur in location or situation that is not ideal, must be postponed
-Dont use for normal operation

23
Q

Maintenance:

A

Removed, disassembled and cleaned with special machine to remove the ash build-up
-CEL will illuminate and fault code
Maintenance 200,000-400,000 miles or 6,750 hours
Use CES20081/API CJ-4 Oil

24
Q

The Selective Catalytic Reduction (SCR) requires DEF. How many gallons does it hold?

A

4 1/2 gallons

Should refill reservoir when refilling fuel or at end of shift

25
Q

What does it mean when no light is illuminated for DEF?

A

DEF level between full and 38% full

26
Q

What does it mean when DEF symbol is on solid?

A

DEF level between 38% full and 12% full

27
Q

What does it mean when DEF symbol is flashing?

A

DEF level below 12% full

28
Q

What does it mean when DEF symbol is flashing and Check Engine light on solid?

A

DEF level below 5% full (1/4 gallon remaining)

29
Q

What does it mean when DEF symbol flashing and Check engine light solid and MIL light solid?

A

DEF tank empty and system no longer maintain DEF pressure

30
Q

What does it mean when DEF symbol flashing and check engine light solid and MIL light solid and Red stop engine lit solid?

A

DEF tank empty and ignored

Engine intentionally shut down or in extended idle

RGC A/O (45 decks)

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