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03:26-01 Issue 1 en-GB © Scania CV AB 2016, Sweden

EXHAUST GAS AFTERTREATMENT EU4, EU5 and EEV Injection nozzle - 4A

Side venting for refilling

NOx sensor control unit connected to NOx sensor - 4D

NOx sensor control unit connected to NOx sensor - 4E Only on DC1621.

6. EMS control unit

1. Reductant tank

V117

Reductant doser - 3 See Detail B

1E

1D

ECU EMS

T113

Approx. 3.5 bar

Cover/venting - 1D See Detail A

From 2.9 to 4.2 bar

Q °t

1C

Reductant pick-up unit with integrated level and temperature sensor - 1A and 1B See Detail E

Detail B V117

1B

7B

T116

T131 NOx sensor - 4E

Magnet

1A

7. Heating system

Reductant doser - 3

2. Main unit 2A

23

2H

Reductant

2D

Reductant tank - 1E

Engine coolant

Compressed air

5B

2G

2K

12

Prefilter - 1C

2E

2B

11

Chemical reaction that reduces the NOx level See Detail D

Valve

V118 Coolant valve for coolant flow (heater) - 7A See Detail F

Mixing chamber - 3B

Manifold fitting - 5B

2J

23

Detail C E67 Marking of connections on the main unit - 2 Marking on the unit

Renewal intervals: M and L inspection

22

11

Carbon dioxide

E67 Main unit -2 See Detail C

Air 8.4 bar Temperature

Nitrogen Oxide (NOx)

Ammonia

Resistor

CO2

Nitrogen

Oxygen

4 NO

4 NH3

O2

x 19

Water

Catalytic converter + temperature 200 to 600°C

Magnetic switch Float with integrated magnet

4 N2

6 H2O

Detail F V118

4A

Key 1. Reductant tank

2. Main unit

• Engine is running and the coolant temperature exceeds 60°C

H = Hydrogen 2 NH3

Level

• Ambient temperature is between 12°C and 8°C

N = Nitrogen

H2O

°t

4. SCR catalytic converter

Activation conditions for reductant heating:

O = Oxygen

NH2- CO - NH2

4D

4C

4B

3A

C = Carbon

250-400°C

3B

3. Reductant doser

4 Nm

Ammonia

21

22

Auxiliary tank - 5A

Detail E T116 Level sensor - 1A Water

P

4E

Ref: See Multi

Reductant

2J

°t Main filter - 2E

Detail D

P

P

12

25 Nm

11....................................Reductant IN 12....................................Air IN 21....................................Reductant OUT 22....................................Air OUT 23....................................Reductant RETURN FLOW

Urea

21

2I

Air 8.4 bar

5. Air supply

To exhaust pipe

ECU SCR

°t

2C

5A T115 NOx sensor - 4D

2F

2L M

7A

Winding

Marking in the diagram

CAN connection

Exhaust gas temperature sensor upstream of the SCR catalytic converter - 4B

Temperature sensor - 1B NTC: ≈ 2 kΩ to 25°C

Generates an operating temperature for the SCR system of approx. 15°C At an ambient temperature of approx. -10°C or lower, the SCR system stops injecting reductant

Test instrument for reductant content in the reductant tank: 588 226 Value in % of weight: 32,5% (30-34%) Test strips for detection of diesel in the reductant: 588 876 The darker blue the colour of the paper, the higher the diesel content in the reductant

3. Reductant doser

1A - Level sensor............... 1B - Temperature sensor.... 1C - Prefilter 1D - Bleed cover 1E - Reductant tank

T116

Reductant supply circuit Reductant return circuit

2A - Solenoid valve for recirculation to the tank 2B - Prefilter 2C - Air control valve 2D - Pump 2E - Main filter 2F - Reductant temperature sensor 2G - Reductant pressure sensor 2H - SCR control unit 2I - Restriction valve 2J - Pressure sensor 2K - Integrated heating pad 2L - Pressure fluctuation damper 2M - Overflow valve 3A - Injection valve.......... 3B - Mixing chamber.....

Engine cooling circuit

Air Pipes gathered in one hose

V117

4. SCR catalytic converter 4A - Injection nozzle 4B - Exhaust gas temperature sensor upstream of the SCR catalytic converter...... T113 4C - Exhaust gas temperature sensor downstream of the SCR catalytic converter (discontinued 2007) 4D - NOx sensor...... T115 4E - NOx sensor upstream of the silencer...... T131 Only on DC1621. 5. Air supply 6. EMS control unit 7. Heating system

5A - Auxiliary tank 5B - Manifold fitting 7A - Solenoid valve for water flow......V118 7B - Heating duct

367 253

Detail A