I–Shift, Design and Function

IMPACT 3.0

Monday, 12 January 2015

43/Diagnostics/FH, ATO2512C/MID 130 PID 160 Parameter setting

FH

131707418

Tuesday, 26 March 2013

Gearbox, mechanical I–Shift, design and function ä Contents General Gear ratio Gearbox construction Synchronisation Range housing Range gear Emergency steering servo pump Oil cooler Control housing Countershaft Countersha ft brake Clutch cylinder Lubrication system Gearbox ventilation Ventilation Electrical system Compressed air system Power train Auxiliary brake brake lever Gear selector Display Program packages Function description Communication with other control units

General

COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Make

VOLVO

Type

AT2412C AT2512C AT2812C ATO2512C ATO3112C

Unsynchronized main gearbox

Symbols

ATO2512C

A - Automatic T - Transmission O - Overdrive 25 - Torque 2500 Nm 12 - Number of forward gears C - Generation

Range gear

Synchronised

Split gear

Synchronised

Number of gears

Forwards

12

Reverse

4

AT2412C, AT2512C, AT2512C, ATO2512C ATO2512C

AT2812C, ATO3112C ATO3112C

Weight without oil

271 kg

277 kg

Length

891 mm

909 mm

Gear ratio COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Make

VOLVO

Type

AT2412C AT2512C AT2812C ATO2512C ATO3112C

Unsynchronized main gearbox

Symbols

ATO2512C

A - Automatic T - Transmission O - Overdrive 25 - Torque 2500 Nm 12 - Number of forward gears C - Generation

Range gear

Synchronised

Split gear

Synchronised

Number of gears

Forwards

12

Reverse

4

AT2412C, AT2512C, AT2512C, ATO2512C ATO2512C

AT2812C, ATO3112C ATO3112C

Weight without oil

271 kg

277 kg

Length

891 mm

909 mm

Gear ratio COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Gear engaged

AT2412C, AT2512C, AT2812C

ATO2512C, ATO3112C

1st

14,94:1

11,73:1

2nd

11,73:1

9,21:1

3rd

9,04:1

7,09:1

4th

7,09:1

5,57:1

5th

5,54:1

4,35:1

6th

4,35:1

3,41:1

7th

3,44:1

2,70:1

8th

2,70:1

2,12:1

9th

2,08:1

1,63:1

10th

1,63:1

1,28:1

11th

1,27:1

1,00:1

12th

1,00:1

0,79:1

Reverse gear (R1)

17,48:1

13,73:1

Reverse gear (R2)

13,73:1

10,78:1

Reverse gear (R3)

4,02:1

3,16:1

Reverse gear (R4)

3,16:1

2,48:1

Gearbox construction The gearbox construction consists of three main parts: a clutch housing, a basic housing and a range housing. The clutch housing forms the front end plate of the gearbox. The base housing contains the main, counter and reverse shafts along with a selector unit which is integrated into the control housing. The range housing contains the range gear planetary gear and the output shaft.


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1. Clutch housing 2. Main housing 3. Range housing for the retarder The main parts in the gearbox are the input shaft, main shaft, range gear with selector unit, countershaft, oil pump with reverse shaft, as well as the control housing with selector unit. The trailing wheels for the reverse gear and basic gears are located on the main shaft. The range gear's sun gear is also integrated with the main shaft. The countershaft has fixed gears. The range gear incorporates a planetary gear and is integrated with the output shaft. Gearboxes equipped with a power take-off also have a drive shaft fitted.


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1. Input shaft 2. Main shaft 3. Range gear with selector unit and retarder drive 4. Countershaft 5. Oil pump with reverse shaft 6. Control housing with selector unit 7. Drive shaft for power take-off

Synchronisation COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Split gear (A) is synchronized. The main gearbox housing (B) with its gears is not synchronized. Range gear (C) is synchronized.

Range housing Range housing (C) can be combined with: Power take-off; see option instructions for variants Emergency steering servo pump Retarder unit

Range gear The range synchronization lies outside the ring gear, reducing the unit's length. The large synchronization area results in short selection time, the wide planet gears give a strong range and the helical gears result in a quiet planet gear.


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Range gear with selector unit and retarder drive

Emergency steering servo pump The emergency steering servo pump is located on the gearbox and is driven by the gearbox output shaft. The emergency steering servo pump is activated when for some reason the normal power steering circuit fails.

Emergency steering servo pump, PSS-DUAL

Oil cooler


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The gearbox oil cooler function is not affected by whether the gearbox has a retarder or not.

Control housing Gears are selected using the gear selector. Once a gear has been selected, the system reduces the engine torque to a suitable level, after which the gears are shifted to neutral. After the gearbox has been put into neutral, the engine speed is adjusted to accommodate the speed of the selected gear, after which the gear shift takes place. The control housing cover has two or sometimes three electrical sockets. When there is no retarder, the following applies: I Vehicle communication II Clutch cylinder III — The following applies with retarder: I Vehicle communication II Retarder III Clutch cylinder


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The control housing incorporates nine solenoid valves: 2.

Solenoid valve 2nd gear

LR.

Solenoid valve, low range

3.

Solenoid valve 3rd gear

HR.

Solenoid valve, high range

B.

Solenoid valve, brake

HS.

Solenoid valve, high split 1

R.

Solenoid valve, reverse

LS.

Solenoid valve, low split1

1.

Solenoid valve 1st gear

1

HS and LS have reversed functions on Over Drive gearboxes.

The control housing incorporates the following components: Four parallel cylinders, split, 1/R and 2/3 and range. COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Four inductive sensors for the positioning of the pistons. Two speed sensors, one for the main shaft and one for the countershaft. The input shaft speed is set by the countershaft sensor. An oil temperature sensor, selector forks for split gears and main gearbox. The oil temperature sensor is located on the cabling for the rpm sensor. A pressure sensor. Control unit for transmission, TECU.

Locations of cylinders and position sensor A. Split cylinder B. 1/R cylinder C. 2/3 cylinder D. Range cylinder E. Position sensor for the split cylinder

Location of position sensor and speed sensor COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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A. Position sensor range cylinder B. Speed sensor, countershaft C. Speed sensor, main shaft D. Position sensor, 2nd and 3rd cylinders E. Position sensor 1st and reverse cylinder

Parameter settings for installation of GCU-D (GCU-D: Gear Control Unit for I-Shift generation D ) For more information regarding GCU-D and these parameters, see - MID 130 PID 160 Parametersetting .

GCU ID

Unit

KBQ

0

The main shaft has a 72 teeth sensor wheel mounted

1

The main shaft has a 30 teeth sensor wheel mounted

0

There is a speed-sensor-D1 mounted

1

There is a speed-sensor-C2 mounted

KBR

Designation

1

Speed sensor for I-shift gearbox generation D

2

Speed sensor for I-shift gearbox generation C

Countershaft brake The counter shaft brake is located at the front of the counter shaft and brakes the rotating parts the gearbox when a start gear is selected, which eliminates gearbox wear, deposits and noise. The brake is also sometimes used during changing up to give quicker gear changes. It is activated using an integrated pneumatic cylinder.


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Countershaft brake

Clutch cylinder The clutch cylinder is located in the clutch housing, concentrically round the input shaft with a position sensor which measures clutch wear. A valve unit controls the clutch cylinder and is located on the outside of the clutch housing.


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A. Clutch cylinder B. Position sensor C. Valve unit D Bleeder nipple for the valve unit.

Lubrication system


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The gearbox is lubricated through a combination of pressure and splashing. The oil is led into the main shaft to lubricate and cool the range gears as well as the input and main shaft bearings. The countershaft brake, output shaft bearings, emergency steering servo pump drive, retarder gear and power take-off are also lubricated. The lubrication system has two overflow valves. One valve ensures that the gearbox is lubricated if the filter gets blocked while the other prevents excessive pressures in the system, e.g. during cold start. The valves are made up of a compression spring and a valve peg.


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The overflow valve which ensures that the gearbox is lubricated.

Overflow valve which prevents excessive pressure.

Oil pump The oil pump is an eccentric pump driven by the countershaft via a gear. The pump is mounted in two needle bearings in the reverse shaft. There is a full flow oil filter of the insert filter type on the pressure side of the pump. It is located in the oil filter housing in the main housing. A support pipe is fitted in a cover that is fastened to the bottom of the oil filter housing. The support pipe prevents the filter, which sits on the outside, from collapsing.


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Oil level The oil level is checked with a level glass (2) and adjusted using two drain plugs (1A and 1B) and two filler plugs (3 and 4), see picture below. Over-filled oil can also be adjusted using level plug (3). Read more about oil quality and oil change volumes in - Preventive maintenance intervals .

Level glass for checking oil level

Gearbox ventilation

The previous version


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1A. Drain plug 1B. Drain plug 2. Level glass 3. Filler plug/level plug 4. Filler plug/Ventilation valve and hose The later version


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1A. Drain plug 1B. Drain plug 2. Level glass 3. Filler plug/level plug 4. Filler plug

Ventilation There are two version of gearbox housing, the later version was introduced week 0907

Breakpoint chassi number: A 693152– B 553957–

The previous version


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The ventilation in the previous version runs through a hose. In this previous version, the main shaft cover is not involved in the gearbox ventilation.

The later version

The ventilation (breathing) of the gearbox goes via the main shaft cover (1) through a chamber (2) and a hole up to the Gear Control Unit, GCU (3). The air passes different chambers (4) and (5) before it goes out to the ambient air through the channels (6), in the gearbox housing. Ventilation air from the gear shift cylinders also passes one of the chambers ( 5) and then out to the ambient air through channels (6), in the gearbox housing. This gives clean air into the gearbox COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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as well as ventilation of the gearbox to the ambient air without oil moisture.

Gearbox housing options The previous version

(A)— GCU, the previous version. (B)— Sealing, the previous version. (C)— Main shaft cover, the previous version. (D)— VentiIation valve and hose, the previous version. The later version


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(E)— GCU, the later version. (F)— Sealing, the later version. (G)— Main shaft cover, the later version. (H)— Filler plug, the later version.

Possible combinations It is possible to combine parts from previous and later version of ventilation. If there should be any uncertainty after old and new parts have been combined, to make sure that the gearbox get a correct ventilation, the valve and hose (D) from previous version of ventilation can always be retrofitted.


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Caution The later version of the main cover (G) can not be used at the previous gearbox housing .

Gearbox housing options

(A)— Gearbox house, the previous version. (B)— Gearbox house, the later version. (C)— GCU, the previous version. (D)— GCU, the later version. (E)— Sealing, the previous version. (F)— Sealing, the later version. (G)— Main shaft cover, the previous version. (H)— Main shaft cover, the later version. (I)— VentiIation valve and hose, the previous version. (J)— Filler plug, the later version.

Gearbox ventilation The previous version


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1A. Drain plug 1B. Drain plug 2. Level glass 3. Filler plug/level plug 4. Filler plug / Vent valve andhose The later version


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1A. Drain plug 1B. Drain plug 2. Level glass 3. Filler plug/level plug 4. Filler plug

Electrical system Sensors and sockets, for gearboxes without a retarder


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I. Vehicle communication II. Clutch cylinder A. Speed sensor


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Cabling from socket I to the speed sensor and chassis cabling.

Cabling from socket II to the valve unit for the clutch cylinder.

Sensors and sockets, for gearboxes with a retarder


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I. Vehicle communication II. Retarder III. Clutch cylinder A. Speed sensor

Cabling from socket I to the speed sensor and chassis cabling.


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Cabling from socket II to the retarder.

Cabling from socket III to the valve unit for the clutch cylinder.

Compressed air system Compressed air connections


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Compressed air connection between the control housing and the valve unit for the clutch cylinder.

For the high pressure system, compressed air connection between the control housing and the four-circuit valve. For the low pressure system, compressed air connection between the control housing and the pneumatic tank. COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Pneumatic connection between the control housing and the countershaft brake.

Power train The following illustrations show the power train for AT2412C, AT2512C and AT2812C.


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1st gear

2nd gear


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3rd gear

4th gear


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5th gear

6th gear


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7th gear

8th gear


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9th gear

10th gear


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11th gear

12th gear


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Neutral N1

Neutral N2


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Reverse gear (R1)

Reverse gear (R2)


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Reverse gear (R3)

Reverse gear (R4) The following illustrations show the power train for ATO2512C and ATO3112C.


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1st gear

2nd gear


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3rd gear

4th gear


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5th gear

6th gear


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7th gear

8th gear


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9th gear

10th gear


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11th gear

12th gear


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Neutral N1

Neutral N2


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Reverse gear (R1)

Reverse gear (R2)


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Reverse gear (R3)

Reverse gear (R4)

Auxiliary brake lever On all vehicles with a retarder and on vehicles with an automatic gearbox and engine brake (VEB) the auxiliary brake is applied using a lever on the steering shaft. 0 Auxiliary brake not applied A Automatic mode COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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1–3 Manual mode B Position for activating the brake program. Spring return to position 3.

The illustration shows a vehicle fitted with the Basic program set, which has no brake program. When the auxiliary brake lever is moved to position B, the gearbox will select a gear giving an engine speed of just over 1500 rpm. If the speed in reduced, the gearbox will then select gears to maintain an engine speed between 1000-1500 rpm (B). The driver can also change down further by moving the auxiliary brake lever to position B.


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Without the brake program, (A) desired rpm for first change down, (B) area for braking using the auxiliary brake. The vehicle in the illustration is fitted with one of the program sets Distribution & Construction, Long Haul Fuel & Economy or Heavy Duty GCM Control, which include the braking program. When the auxiliary brake lever is moved to position B, the gearbox will select a gear giving an engine speed above 1500 rpm. The gearbox will then select gears to maintain an engine speed above 1500 rpm (B).

With the brake program, (B) area for braking using the auxiliary brake. Note: The effect of the auxiliary brake may be reduced by the I-shift control unit, MID 130, to make the ride as comfortable as possible. The effect reduction is regulated by the selected gear, vehicle weight and road surface inclination. For more information on auxiliary brake component parts, see group 21, Description, Design and Function, Engine.

Gear selector Gear selector (GLU) is attached to the driver's seat and can be folded away to ease passage inside the cab. The gear selector control unit is in the dashboard. The gear selector incorporates the following functions: 1. Three position switch with spring return for up and down changing. 2. Button for lowering the lever into a horizontal position. 3. Gear selector inhibitor preventing the vehicle from being put in gear unintentionally. 4. Gear selector position: R = reverse gear N = neutral A = automatic M = manual 5. Button E/P for economy/performance position. 6. Button L Limp Home. Note: The Limp Home function is intended for moving the vehicle short distances in order to get off the road and to a COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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workshop. Only one gear can be used and the driving may be jerky. For information on how to engage and use this function, see driver instructions.

Display The display provides information on the gear currently selected and which gears are available. The display is divided into smaller fields showing: 1. Driving program 2. Selected gear 3. Available gears (down/up) 4. Lever position


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Program packages General notes on the program packages The gearbox has different functions depending on which program package is installed in the gearbox. The following program packages are available: Basic is the standard gearbox program Distribution & Construction include functions that make the truck lighter to manoeuvre. Long Haul Fuel & Economy include functions that partly improve fuel consumption and partly make the truck lighter to manoeuvre. Heavy Duty GCM Control is designed for heavy trucks. This program also contains functions that help to improve fuel consumption and make the truck easier to manoeuvre. Which program package is installed in the vehicle? When the gear selector is in neutral position (N) and the FOLD button is pressed in, the lever can be folded forwards. COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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The display then shows the program variant the gearbox has. Display

Program packages

VDA variants

B

Basic

TP-BAS

DC

Distribution & Construction

TP-DICON

FE

Long Haul Fuel & Economy

TP-FUEC

HD

Heavy Duty GCM Control

TP-HD

Change program package When a program package is replaced, the Central system (VDA) must be updated before it can be downloaded to the vehicle. This is done by entering the Converting set number in the computer tool which is stated in Part information, accessory . After replacement, reprogramming must be carried out using the TECU control unit (MID 130), and the gearbox must be recalibrated.

Functions in every program package Function


Basic



I-Roll

X

X

Smart Cruise Control

X

X

Launch Control

X

X

X

Enhanced Shift Strategy (GCM ≤ 60 T)

X

X

X

Heavy Duty GCM Control (60 T < GCM ≤ 180 T) Possible optional functions

X

Basic


Gear Selection Adjustment in Auto including Kickdown Enhanced Power Take Off Functions

X



X

X

X

X

X

X

Not installed

Variant for optional functions Name

Variant

Installed

Gear Selection Adjustment in Auto

AMSO-AUT

X

AMSO-BAS

X


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Enhanced Power Take Off Functions

APF-ENH

X

APF-BAS

X

Customer parameters Customer parameters in the gearbox control unit: Note: The default value can vary depending on the program package selected. ID

Designation

Default Value

Unit

FZC

Highest used start gear (1 – 6).

GJJ

Load on the engine PTO even when it is deactivated. 1

No

Yes/No

GJI

Determines whether the transmission is disconnected from

No

Yes/No

Selectable

LS/HS/Selectable

Selectable

LS/HS/Selectable

Auto

Manual/Auto/Disabled

6

the clutch in Auto Neutral.1 2 GJG Determines how the split gear performs when PTO 1 is connected for the gearbox. 1 GJH

Determines how the split gear performs when PTO 2 is connected for the gearbox. 1

IEO

Determines how the transmission performance mode is handled: Manual: Performance mode available. Auto: Performance mode available. The transmission will automatically return to Economy mode when the engine is no longer operating under high load. Disable: Performance mode not available.

1

For further information, see options instructions.

2

GJI only used at APF-ENH; the others are always included.

Function description Standard functions The following standard functions are available in the gearbox: Automatic choice of start gear. Possibility to change automatically selected gears when the accelerator pedal is released. A display that shows the gearbox oil temperature and a warning system that informs the driver when the oil temperature is too high.

Optional functions I-Roll (VEB or retarder required) This function automatically engages and disengages the freewheel to reduce fuel consumption. When you release the accelerator, the transmission shifts to neutral, so that the vehicle can roll freely and the engine goes COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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down to idle. Smart Cruise Control The function is only active when cruise control is activated. Saves fuel by deactivating the auxiliary brakes under certain conditions. The function releases the auxiliary brakes after a downhill stretch, which improves cruise control performance. Launch Control Allows driving with the engine idling without slipping the clutch. Regulates engine torque when pulling away for optimum gear changing and avoid high engine speed. The following functions in Launch control require EBS: Improved comfort when pulling-up through smoother disengagement when pressing lightly on the brake pedal. Automatic application of the brakes when the vehicle rolls in the wrong direction, in relation to the selected gear. Automatic application of the brakes to stop the vehicle and change from a forward to a reverse gear or vice versa. HSA, Hill Start Aid, which is only active on inclines. See also the description of Hill Start Aid: Function group 593, Information type Description Electronically controlled braking system (EBS) . Enhanced Shift Strategy Automatically selects the lowest possible gear when the air suspension is in manual mode in order to obtain optimal manoeuvrability. ECS required. Improves engine brake performance by selecting gears that increase engine speed. Temporarily applies the wheel brakes when changing gear to compensate for the engine brake when the brake program is active. This function requires ABS-EBS. If a trailer without ABS is hitched up, the function is deactivated. Heavy Duty GCM Control This function makes it possible to adjust the gearing strategy to suit the rolling weight - up to 180 tonne. Gear Selection Adjustment in Auto including Kickdown The function makes it possible to adjust automatically selected gears even when the accelerator pedal is depressed. There is also a Kick Down function for maximising the acceleration of the vehicle. Enhanced Power Take Off Functions Optional functions that support power take-off operations, e.g. Auto Neutral and splitbox. Optional functions: Makes it possible to determine software parameters that limit engine speed when power take-off is used. The function forms a gear selection strategy to suit engine speed limitations. Disengages the transmission at the request of the options module, irrespective of the gear lever position, when Auto Neutral is activated. Blocks reverse gear when the options module requests reverse inhibit. Makes it possible to use the splitbox for driving the power take-off at high capacity.

Communication with other control units Summary, components (signal summary)


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Component list Component

Description

A03 (MID 140)

Central instruments

A12 (MID 136)

Control unit, ABS

A13 (MID 130)

Control unit, TECU (transmission electronic control unit)

A14 (MID 128)

Control unit, EECU (engine electronic control unit) COPYRIGHT © Copyright Volvo Parts C orporation

The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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A16 (MID 150)

Control unit, ECS (electronically controlled suspension)

A17 (MID 144)

Control unit, VECU (vehicle electronic control unit)

A21 (MID 136)

Control unit, EBS (electronically-controlled brake system)

A27 (MID 216)

Control unit, LCM (external lighting)

A33 (MID 220)

Tachograph

A36 (MID 249)

Control unit, BBM (body builder module)

A41 (MID 222)

Control unit, RECU (retarder control unit)

A109 (MID 223)

Control unit, GSECU (gear selection electronic control unit)

B04

Sensor, engine speed, crankshaft

B12

Sensor, tachograph/speedometer

B13-73 B25 B55-58 B175 S07 S08/S09

Sensor, wheel speed Sensor, accelerator pedal Sensor, air pressure in air spring bellows Sensor, load indicator Switch, engine brake Switch, differential lock

S24

Retarder stalk switch

S25

Switch, cruise control

S28

Power take-off switch

S59

Position switch, brake pedal, NO

S171

Gear lever, GLU

XO5

Trailer connector, 7-pin, 24 S

Y39

Solenoid valve, VEB (Volvo engine brake)

Communication with control unit VECU (A17), MID 144 Signals / information to TECU: The vehicle control unit parameters MG, MH and AQ must have the same values. Check the parameter settings in the VDA. Accelerator pedal position, including kick-down. Cruise control. Retarder control. For further fault tracing see the PC-tool, function group 5. Power take-off control, see options instructions. Brake pedal position. Parking brake applied or not. The VECU K-factor must be the same as the tachograph K-factor. COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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Vehicle weight information on leaf suspension vehicles ( RADD-BR and RADD-TR), used for gear selection.

Communication with the control unit Central instruments (A03), MID 140 Signals / information from TECU: Gear selector, positions. Gear selected. Possible gears. Driving program E/P. Time and date for diagnostics. When using the power take-off, the driver can choose between N1=low split and N2=high split for different PTO gear ratios, see the options instructions. When the gear lever is in neutral position (N) and the button FOLD is pressed in, the lever can be folded forwards, and the display shows which program set the gearbox has.

Communication with control unit EECU (A14), MID 128 Signals / information to TECU: Engine speed. Engine configuration Engine torque If the engine is not running smoothly, this will adversely affect gear shifting.

Communication with control unit ABS/EBS (A12/A21), MID 136 Signals / information to TECU: Wheel speed sensor. Wheel spin information; the vehicle does not change gear. ABS system active, the vehicle does not change gear. Information from ESP, the vehicle does not change gear. If Traction Control is disengaged via the display, the gearbox may change gear due to spinning. In Launch Control the gearbox can control the brakes. For more detailed information, see Function description for Launch Control.

Communication with control unit ECS (A16), MID 150 Signals / information to TECU: Vehicle weight. ECS control unit status. Always start in 1st gear if the manoeuvre control unit for the air suspension is in manual mode.

Communication with control unit LCM (A27), MID 216 COPYRIGHT © Copyright Volvo Parts C orporation The information contained herein is current at the time of its original distribution, but is subject to change. The reader is advised that printed copies are uncontrolled.

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I–Shift, Design and Function

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