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CD 38

May 2007

M A G

Information

newsletter

about Citroën's

Diagnostics

Tool

EDITORIAL

Spring is here and the After-Sales Technical

Department takes you off the beaten track with

the launch of Citroën's first ever 4x4, C-Crosser.

You will also discover all the new features and

functions of the diagnostics CD-ROM 38, which

includes

C4 SEDAN with the Flex Fuel technology used in

Brazil and the new

RT4 telematics unit.

You can also discover the latest changes to the

diagnostics trees and the procedures used to find

permanent consumers.

Finally, this issue includes the functionality of the

reference curves.

Happy reading and diagnostics!

The After-Sales

Technical Management Team

IMPORTANT

This newsletter must be

given to Citroën senior

technicians, senior

mechanics and technicians.

C O N T E N T S

NEW FEATURES

C-Crosser

Citroën C4 Sedan

Flex Fuel

Tablet PC

P.2

P.4

P.5

P.6

P.7

P.8

ZOOMING

Changes to the diagnostics

trees

Reference curves

Diagnostics assistance procedure

The new RT4 unit

DIAG CRI reminder

TIPS & TRICKS

INSTALLATION

LEXIA mag - MAY 2007

Issue CD-ROM 38, P/N 0072D5 - GB

Vehicle news

The diagnostics of the

C-CROSSER

Remote

codable

- 2WD: front-wheel drive,

- 4WD: four-wheel drive,

- Lock: four-wheel drive with special control

laws for the rear drivetrain.

The electronic clutch of the rear axle is

controlled by an ECU that transfers torque

to the rear axle in 4WD or Lock mode,

when the front wheels loses grip. A loss of

grip is detected by the wheel sensors

of the ABS system.

The AWD sensor receives the data sent by

the CAN and modulates a current between

0 A and 3 A according to the engine torque

to be applied to the rear wheels.

For diagnostics purposes, this ECU is located

under the dashboard, next to the clutch

pedal.

Diagnostics can be used to view faults,

settings measurements and actuator tests.

An actuator test is used to override the

transmission of torque to the rear wheels

in order to check the condition of the

electronic clutch.

The C-CROSSER in brief

The diesel version of C-Crosser will arrive in

the network in July 2007. It is the very first

4x4 Citroën. The model has been developed

in partnership with Mitsubishi and is based

on the Outlander.

diagnostics functions are centralised in the

ETACS.

This is the reason why any requests relating

to these ECUs that are made in the menus of

the diagnostics tool cause the tool to inter-

rogate the ETACS using specific routines.

The master ECU: ETACS

ETACS is the equivalent of the BSI ECU. It

centralises certain functions and acts as the

gateway between the vehicle's diagnostics

connector and the other networks.

Note that the ETACS does not contain a

fault log (JDD).

• Downloading

and remote coding

The following ECUs are available for the

download and/or remote coding functions:

ECU

ETACS (BSI)

Diesel CMM

Petrol CMM

CVT

Down

loadable

Some special features

of C-CROSSER

•

A new engine

C-Crosser is fitted with the new 157 hp

DW12M 2.2-litre HDi, which is an evolution

of the DW12B. The DW12M powerplant

features a single variable-geometry turbo

controlled by an electric actuator with

position repeat.

The DW12M is the first engine to be fitted

with a solenoid used to by-pass the EGR

exchanger, which is why the new parameter

"Position set point for EGR cooler by-pass"

has been introduced .

Note:

since the air conditioning pressure

sensor is not connected to the injector ECU,

the measurement of this parameter is produ-

ced by information from the air conditioning

ECU.

Tip:

if the vehicle runs out of fuel, the

following sequence must be completed 3

times:

"switch on the ignition - wait 15

seconds - switch off the ignition",

so that

the boost pump in the tank fills the low-

pressure circuit. After these three sequences,

switch on the starter.

• Electronic architecture

The general architecture is based on three

networks that interconnect the numerous

ECUs. Two CANs and one LIN are present

on the vehicle.

• Remote ECUs

For the diagnostics tool, the door and sun

roof module ECUs present on the LIN

are special. All of the communication and

Note that when remote coding, the other

ECUs are self-programmed by the ETACS.

The ETACS updates the other ECUs on

the network using the information that it

contains.

• The steering wheel angle sensor

On C-Crosser, the steering angle sensor is

an ECU in its own right. It has its own self-

diagnostics function.

It can be found in the "Active, passive safety"

menu in the diagnostics tool.

It is calibrated in this ECU rather than in the

ESP, which is the case in other vehicles.

• A unique ECU:

the rear axle electronic clutch

C-Crosser is usually driven by the two front

wheels. However, a selector switch on the

central console can be used to change the

drive mode when stationary or when on the

move. There are three modes:

• Xenon headlights

Xenon headlights are available as an option.

The headlight settings are controlled by a

specific ECU.

This ECU cannot be accessed in the general

test. It can be found in one of the Handset

menus on the "headlight level correction"

tab.

Only "Read fault" is available.

The settings are applied mechanically.

The faults are not read directly in the

diagnostics tool in the shape of fault codes

that are displayed on the screen, which is

the case for most PSA ECUs, but in the shape

of pictograms displayed on the vehicle's

handset (see photo).

Start a diagnostics session for this ECU using

the tool, follow the instructions to identify

the fault code on the handset, note the code

and check that it matches the associated

fault.

General comment:

The notion of momentary and

permanent faults and the associated

contexts remain identical to those used

in the Brand's other vehicles.

Vehicle news

Available engines

Power-

train

6-speed

manual

5-speed

manual

Headlight pictogram

Petrol

2.4-l - 170 hp

Diesel

Hdi PF

2.2-l - 157 hp

CVT

Location of diagnosis socket

Socket positioned at the base of the

steering column

N°

7800

7020

6750

1320

1630

7701

CAN-C

Dynamic stability control

ABS / traction control

4x4 transmission ECU

Injection/ignition

Gearbox

Steering wheel angle sensor

N°

8208

8410

6570

8492

8080

0004

8500

CAN-B

Coded immobiliser electronic

unit

Car radio or radio telephone

(car radio part)

Driver and passenger airbags

Hands-free kit

Air conditioning

Handset

Navigation aids

N°

6830

9030

9050

9032

9033

LIN

Sunroof

Driver door control plate

Passenger door control plate

Rear left door control

Rear right door control

LEXIA

MAG- CD 38

CITROËN C4 SEDAN FLEX FUEL

A Flex Fuel version of C4 SEDAN fitted with

the 1.6-litre petrol powerplant (TU5JP4) is

available in Brazil.

The ME7.4.9 BOSCH engine control ECU is

used for this type of injection.

Flex Fuel engines can work with variable

proportions of gasoline / ethanol mixes.

The proportion of alcohol can vary from 22%

(E22) to 100% (E100) for this vehicle.

using the additional gasoline tank and then

to switch to the main gasoline/ethanol tank,

once the engine is hot.

In the diagnostics tool, specific dynamic Flex

Fuel settings (for vehicles in Brazil) have

been added to the ‘’Settings measurements /

ME7.4.9 Flex Fuel" menu:

- Status of the cold start relay (active or

inactive, depending on the ECU settings).

- Percentage of alcohol present in the mix in

the main tank.

- Alcohol meter in litres that represents the

total volume of ethanol consumed by the

engine.

Note:

there are no special fault codes for

this vehicle.

USE:

the engine can run only gasoline

only in the main tank.

Vehicle news

The Flex Fuel version features some specific

components:

- an additional fuel tank located under the

front bonnet and fitted with a pump and a

solenoid.

- A cold start relay that is controlled by the

engine control ECU and is used to start

Additional

gasoline

tank

TABLET PC

Processor

Operating system

Installed RAM

Max RAM capacity

Battery technology

Digitiser

Hard disk

BIOS

System bus speed

Graphics processor

Audio

Communication

Wireless communications

Connecters

Display

Battery technology

Battery life

Dimensions

Weight

news ABOUT TOOls

ments in information technology, including

increased storage space and 1 GB of RAM for

improved performance.

This new platform is fully compatible and

integrated in the existing working environ-

ment in the Brand's workshops. The new

platform offers the same software functio-

nality.

ACTIA guarantees the software compatibi-

lity of the first versions of the tablet PC that

have already been deployed on LEXIA 3.

At the start of 2007 and with the release of

CD-ROM N°38, ACTIA introduced a latest-

generation Tablet PC into its LEXIA3 offer,

which benefits from the very latest develop-

Changes in characteristics and performance of the Lexia 3 tablet PCs

Before end 2006

Fujitsu ST 4120

Intel Pentium III 933 MHz-M

Microsoft© Windows© XP Tablet PC Edition 2002

256 MB

768 MB (by adding two 512 MB bars)

Lithium ion (6-cell: 10.8 V, 4,000 mAh)

Electromagnetic (active)

30 GB (extendable to 60 GB) 2°5

Phœnix BIOS, 8 Mbit, flashable

133 MHz

Intel 830 MO

Sound board (STAC9767)

Modem V.90, 56 K, 10/100 Base-T-Ethernet

Wireless LAN (802.11b)

2 USB 1.1 ports; IEE 1394; RJ-11 modem; RJ-45 LAN;

IrDA 1.1; VGA; 1 type 1 or II; PCMCIA; headset port;

microphone port; keyboard/mouse port

10.4*XGA TFT active matrix

Lithium ion (6-cell: 10.8 V, 4,000 mAh)

4 hours (3h30 when measuring)

30.1 cm x 22 cm x 22 cm

1.5 kg

Fujitsu ST 5020

Intel Pentium III 1.10 GHz-M

256 MB

2 GB (by adding RAM bar)

Lithium ion (6-cell: 10.8 V, 4,000 mAh)

Electromagnetic (active)

40 GB (extendable to 60/80 GB) 2°5

Phœnix first BIOS, 1 MB, flashable

400 MHz

Intel 855 GMO

Sound board (BSTAC9753A)

Modem V.92, 56K, 10/100/1000 Base-T/TX-Ethernet

Bluetooth TM system, Intel PRO Wireless 2200 BG

Network Connection option (WI-FI® communications

certified 802.11 b/g)

2 USB 1.1 ports; IEE 1394; RJ-11 modem; RJ-45lrDA 1.1;

VGA; 1 type 1 or II; PCMCIA; headset port; microphone

port; keyboard/mouse port; external screen port;

SD/MC connector

12.1*XGA TFT, 180° display

Lithium ion (6-cell: 10.8 V, 4,000 mAh)

6 hours (3h30 when measuring)

32.4 cm x 22 cm x 4 cm

1.55 kg

2007

MOTION LE 1600

Intel Pentium M LV 758 - 1.5 GHz

1 GB of memory (400 MHz DDR2)

1.5 GB

Lithium ion (4-cell: 14.8 V, 2,600 mAh)

Electromagnetic (active)

60 GB HD - 1.8 inch on shock absorbers

Phœnix BIOS, 1 MB, flashable

400 MHz

Chipset Intel 915 GMB

Sound board (AC97)

Built-in Ethernet LAN controller 10/100/1000 with

RJ-45 connector (Ethernet gigabyte)

Bluetooth, Infrared IrDA, WiFi (Intel 802,11 b/g or

Atheros a/b/g), Ethernet Gigabit

I/O Ports and Extensions; VGA DVI (Digital Video

Interface) VGA; microphone input and headset output;

PCMCIA; digital fingerprint reader; USB 2.0 x 2

12.1* TFT XGA with wide angle of vision and variable

brightness sensor

Lithium ion (4-cell: 14.8 V, 2600 mAh)

standard battery with 3h30 lifetime (depending on

the application)

29.6 cm x 24 cm x 18.7 cm - 2.2 cm

1.4 kg

ZOOMing

Changes to the

diagnostics trees

Structure of the

symptom tree

The guided method now converges towards

one or more components (see CD-ROM

N°37 magazine).

This is why the symptom trees include a list

of the components of the ECU incriminated

by the guided method.

Example 1:

photo of the connection BSI

differentiator.

The network has sent us a number

of comments on the structure of the

diagnostics trees. These comments will

soon be integrated and deployed in your

diagnostics tools.

This approach, which is different from the

preceding method, has been introduced on

CD-ROM N° 38 for all of the diagnostics

trees of the

air conditioning function of

C4 Picasso.

The aim is to improve the quality and the

effectiveness of the diagnostics trees and to

make the diagnostics trees easier to use.

The diagnostics trees now start with a cell

indicating the possible origins of the fault and

the components that can cause the fault to

appear.

Example 2:

wiring diagram for the connec-

tion of several differentiators.

According to this diagram, the differentiator

4267-T must be connected to the green

63-channel connector on the automatic

terminal unit and the differentiator 4231-T

to the white 63-channel connector on the

automatic terminal unit.

Advanced BSI

Simply validate the component(s) in the list

indicated by the guided method to access

the corresponding check tree.

The details of the checks are described in the

rest of the diagnostics tree.

From June 2007, "advanced" BSIs will be

installed in C4 Picasso to replace the

"cross-range"

units.

Ultimately, all full CAN vehicles will be

fitted with these new BSIs.

Caution: the "advanced "BSIs" must not

be installed in place of "cross-range"

BSIs and vice versa. This change does

not impact diagnostics.

In order to make it easier to identify

the BSI installed in the vehicle, from

CD-ROM N°38 onwards the tool will

display an additional line entitled "BSI

type" in the "Identification" screen.

Installing

differentiators

When several differentiators are connected

to the automatic terminal unit of the diagnos-

tics tool, the tool displays a wiring diagram to

make it easier to make the connections.

Structure

of the fault tree

The structure of the trees is unified.

Before each check, the following are shown:

• the equipment need to complete the tree,

• an indication of the time taken to complete

the tree.

Wherever possible, the checks follow this

sequence:

• preliminary checks,

• diagnostics checks,

• mechanical checks,

• electric checks.

Path leading to the different diagnostics tree structures

Global test

or test by

function

DIAGSYS

result

Global test

or test by

function

ECU in red

Read fault

Symptom

Tree

Fault

Tree

Note: the simplest checks are

grouped together at the start of the

tree.

Component

check tree

LEXIA

MAG- CD 38

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