Fuel Supply & ME-SFI Engine Management Emission Systems (Part 12) 508 HO Part 12 - Emission systems (WJB)

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1 Fuel Supply & ME-SFI Engine Management Emission Systems (Part 12) 508 HO Part 12 - Emission systems (WJB)

2 These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. Always check for revised or updated information. To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the latest Mercedes- Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair. Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US version vehicles. Refer to the official introduction manual and WIS when available. Copyright Mercedes- Benz USA, LLC, 2000 Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted without written authorization from Mercedes- Benz USA, LLC or its successors. Published by Mercedes- Benz USA, LLC Printed in U. S.A. 2

3 Secondary Air Injection Purpose: To warm up the Three Way Catalyst. Shutoff valves Mechanical or electric pumps. Switchover valve Connecting passages 3

4 Air Injection Flow Air flows to the exhaust ports through internal passages in the head. 4

5 Air Injection Parameters Coolant temperature between ~+10 and +60 O C Not at WOT <3000 RPM Maximum time up to ~150 seconds 5

6 PO410 O2 sensor to ME Once per driving-cycle the pump is activated for ~10sec. Lambda factor should change to ~+25%(rich) Two consecutive failures: 6

7 Air Injection Using Supercharger First version Compressor engaged. Switchover valve activated. Shutoff valve open. Check valve open. Recirculation flap M16/x is fully closed 7

8 Secondary Air Inlet Secondary air inlet goes into the side of the crankcase then through internal passages to exhaust ports in head 8

9 111 Evo Engine Location of components are different. Switchover valve Air shutoff valve Check valve 9

10 Evaporative System Purging is performed at: Coolant temperature > 70ºC. > 2 minutes after engine start. Engine not in deceleration mode. 10

11 Evaporative Leak Test Components B4/3 - Tank Pressure sensor B4/3 Y58/4 - Canister shutoff valve Y58/4 11

12 Evaporative System Codes PO440 - Evaporative system malfunction (leak) PO441 - Purge control valve (function) PO442 - Evaporative system leak (small) PO443 - Purge control valve (Y58/1) PO446 - Charcoal canister shut-off valve (Y58/4) PO450 - Fuel tank pressure sensor (B4/3) PO455 - Evaporative system leak (large) 12

13 Evaporative Leak Test B4/3 Y58/1 Y58/4 PO455 Large leak test Y58/1 closed B4/3 measures for vacuum in tank If no vacuum in10 seconds, the fuel reserve lamp will blink! 13

14 Evaporative Leak Test B4/3 Y58/1 Y58/4 PO442 Small leak test Starts when large leak test has created -7mbar pressure. Y58/1 closed Pressure monitored by B4/3 for 30 seconds 14

15 Onboard Refueling Vapor Recovery - ORVR Atmosphere Engine mbar mbar Flap O-ring Y58/4 Y58/1 Pressure relief valves mbar 15

16 Exhaust Gas Recirculation EGR Purpose: Reduce NO X Improve gas mileage EGR valve Transducer Prerequisites: Coolant temp between 60 O & 110 O C <3500 rpm Part load 16

17 EGR Air Mass sensor EGR valve Intake Exhaust 17

18 EGR 18

19 PO400 Once per driving-cycle, during decel shut-off, ME will activate the EGR (Y31/1) and use the MAP (B28) to check for: a 54mbar pressure drop for ~2 seconds If failure after 2 consecutive drive-cycles: 19

20 Delayed Upshift Purpose: To rapidly heat the TWC Parameters: Maximum 160 seconds Coolant temperature at start < 50 O C Vehicle speed < 53 km/h Alters upshift points (1-2, 2-3) Note: Even if W mode is selected, first gear start. 20

21 Decel Shutoff Purpose: Improved emissions Enhanced engine braking Reduced fuel consumption Parameters: Shutoff Coolant temp >50 O C Engine speed >1350 rpm Throttle valve closed Cruise control Off Fuel start: Engine speed <1100 rpm 21

22 Catalytic Converter HC CO H 2 O CO 2 N 2 NO X 22

23 TWC - Three Way Converter Catalyst Efficiency NO x HC CO Rich λ = 1 Lean 23

24 PO422 & 432 TWC Efficiency ME O2 before TWC O2 after TWC TWC ME continuously checks the signals, if: Inefficient TWC O2 signal after TWC is >75% of O2 before TWC ~170seconds Then after two consecutive driving-cycles: 24

25 Acronyms CO - Carbon Monoxide CO 2 - Carbon Dioxide EGR - Exhaust Gas Recirculation HC - Hydrocarbon MAF - Mass Air Flow Sensor NO X - Oxides of Nitrogen TWC - Three Way Catalyst WOT - Wide Open Throttle 25

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