Mercedes-Benz 2007 CLS 550 User Manual download pdf

30 GEARS March 2009

Mercedes 722.9 Preliminary Information, Part 1

he Mercedes 722.9

transmission has been

around since the later

part of 2004, but there still

isn’t a lot written about it. The

722.9 can be found in these

Mercedes vehicles:

2004-06 – SL500

2005-up – CL500, E500,

S430, 500, SLK350,

55 AMG

2006-up – C230, 280, 350,

CLK350, CLS500, E350,

E63 AMG, R350, 500,

SLK280

2007-up – CLK550, CLS550,

CL600, CLS63 AMG, E550,

E63 AMG, GL320, 450,

ML350, 500, ML63 AMG,

R63, and S550

That’s a lot of vehicles! This 5

generation transmission is the first 7-

speed automatic produced by Mercedes

Benz. The Mercedes designation for

this transmission is New Automatic

Gearbox 2 (NAG2) or 7G–Tronic.

Along with seven forward speeds this

unit also has two reverse gears ratios

(similar to the 722.6) depending on

whether it’s in Sport or Comfort mode.

Shift Strategy

Shift strategy improvements

include:

• Computer reaction time is 0.1

second shorter.

• Downshifts are shortened by

up to 0.2 seconds.

• Coasting downshifts are short-

ened by 0.4/2.5 seconds.

• 37-47 MPH

acceleration times are short-

ened by 23-28% (model

dependant).

• Fuel consumption is reduced

by up to 4%.

• Noise levels are reduced due

to lower engine speed in 5

and 7

gear at constant

vehicle speed.

• Flexible adaptation to vehicle

and engine.

Variable Shift

Programming

There are two basic shift programs

that can be varied by the customer

(similar to the 722.6) using the S or C

button on the Electronic Shifter Module

(ESM):

1. S (Sport)

• 1

gear starts

• Normal shift points

• Reverse gear 1 (3.416:1)

2. C (Comfort)

• 2

gear starts

• Earlier upshifts and later

downshifts

• Reverse gear 2 (2.231:1)

The transmission will start in first

gear if any of these conditions apply:

• 1

gear is selected manually.

• ¾-throttle to full-throttle

acceleration from start.

• Cold engine temperature (pre-

catalytic warmup).

Emergency Function

or Limp-Home Mode

There are a variety of failsafe

modes:

• If a solenoid doesn’t work the

affected gear is blocked. For

example: if solenoid Y3/8y7

or the B3 clutch is defective,

you won’t have 1

, 7

reverse in S mode.

• If a hydraulic fault prevents a

gear from engaging, the previ-

ous gear will remain applied.

• If the computer defaults to

limp mode while driving,

it’ll turn all solenoids off.

by Mike Souza

Mercedes 722.9

Preliminary

Information,

Part 1

30-mikeS309.indd 3030-mikeS309.indd 30 2/11/09 2:33:57 PM2/11/09 2:33:57 PM

1 2 3 4 5 6

Summary of Contents

Page 1 - Mercedes 722.9

30 GEARS March 2009Mercedes 722.9 Preliminary Information, Part 1The Mercedes 722.9 transmission has been around since the later part of 2004, b

Page 2 - GUIDE NOW AVA I L BLE!

GEARS March 2009 31ExclusiveMember-OnlyCredit Card Programe payment processor you rely on for service and stability.Save money on your credit car

Page 3 - Three Speed Sensors

32 GEARS March 2009Mercedes 722.9 Preliminary Information, Part 1will now provide reverse, and 2nd gear with the selector in drive (figure 1).El

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Page 5 - Figure 5

34 GEARS March 2009Mercedes 722.9 Preliminary Information, Part 1Range Sensor FunctionThe Y3/8s1 range sensor is built into the ECM ribbon cable

Page 6 - GEARS March 2009 35

GEARS March 2009 35Figure 8 Figure 9Figure 6Figure 7K1 Clutch AssemblyRavigneaux Planetary GearsPlanetary Assembly30-mikeS309.indd 3530-mikeS309

Mercedes-Benz 2007 CLS 550 User Manual

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Mercedes-Benz 2007 CLS 550 User Manual

Browse online or download User Manual for Cars Mercedes-Benz 2007 CLS 550. Mercedes 722.9

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