RENAULT_ECU_MANUAL.pdf

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Universal RENAULT injection ECU decoding tool

Introduction

Have you ever seen where fuel injection ECU (Electronic Control Unit) on

the Renault car is located? Yes, it is located in most vulnerable place in the

engine compartment. In most cases even after medium-strength impact it

became unusable because of mechanical damage and must be replaced.

However from year 1994 most Renault cars are equipped with engine

immobilizer system and it makes replacement of injection computer more

complicated. There is no problem if replacement ECU is bought from Renault

service dealer - it is sold with no immobilizer code stored, but replacing

computer with used one is impossible because of mismatch of unlocking codes.

And that was why an idea to create universal Renault ECU decoder

revealed. Now if you have this tool you can take used injection computer and

make it not coded as it was bought from Renault stores. Decoder has several

modes of operation and covers all known petrol and diesel injection systems,

introduced in range of year 1994-2001 without intervention in to the ECU

(diesel coded anti-start valve as well). Systems, this tool was tested with, are

listed below:

Petrol

Diesel

SIEMENS FENIX3B

BOSCH MSA15.5 (DTI)

SIEMENS FENIX5

BOSCH EDC15C3 (DCI)

SIEMENS SIRIUS32

LUCAS DCU3R (1.9D)

SAGEM SAFIR (55pin)

Coded fuel cut-off valve (1.9D DDS)

SAGEM SAFIR2 (35pin)

BOSCH MOTRONIC MP7.0

MAGNETI MARELLI IAW 06R

MAGNETI MARELLI IAW 8R.30

Most of engine control unit mentioned above can operate without

immobilizer at all after decoding.

ECUs, that cannot operate without immobilizer code stored in memory:

some of FENIX5 for LAGUNA/SAFRANE 2.0l 16V,

all of SIRIUS32 except for KANGOO 1.4l 16V,

LUCAS DCU3R , Bosch MSA15.5 and EDC15C3;

It means that after decoding procedure on one of those ECU is done, you

must to have immobilizer system properly operating (matching key), to make

the engine start. Immobilizer signal emulator can also be used.

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Operation

Front view of decoder:

IGN-ON LED

START button

+12V

IGN

IMMO

GND

MODE LED

MODE button

Figure 1. Front view .

MODE button is used to switch between operation modes. Mode can be

changed only before pressing red START button. When decoding is in progress,

MODE button becomes inactive.

There are 4 operation modes:

Mode

“MODE” LED

Standard

OFF

Advanced 1

Advanced 2

Slow blinking

Semi-Auto (for TYPE1 immo)

Fast blinking

All you have to do is connect decoder to the ECU you want to decode,

according to connection diagram, select desired mode of operation and press red

START button. Which mode is to be selected depend on engine immobilizer type

and several other factors, described below. Connect ground, battery +12V, MIL

lamp and relay (if required). Use any 12V lamp (up to 3W), any relay with 12V

coil and 12-14V power supply (over-current protection would be an advantage).

Lamp must blink after applying +12V IGN. If lamp goes on and does not blink,

ECU is already not coded or there is mistake in connection.

Connect decoder box as follows: red wire to ECU’s +12V BAT, black wire

to GND, yellow wire to ECU’s +12V IGN (decoder switches +12V on and off by

itself) and green wire to ECU’s immobilizer input.

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On the picture: how it looks like connected and ready for decoding.

Use any relay with 12V coil and any 12V lamp where necessary.

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1.1.

Immobilizer system overview

Renault immobilizer systems are divided in to three types – TYPE1,

TYPE2 and TYPE3. This tool is able to decode ECUs with TYPE1 and

TYPE2 immobilizer. Engine ECU from the TYPE2 system is decoded

automatically with this tool; therefore TYPE1 ECU decoding is semi-

automatic. It is very easy to find out what type of immobilizer is used with

ECU you want to decode: if after ignition-on malfunction indicator

lamp (MIL) illuminates for 2 seconds then starts to flash, this is

TYPE2 immobilizer system; if after ignition-on malfunction indicator

lamp (MIL) flashes immediately, this is TYPE1 immobilizer system .

Immobilizer type

Prod. date

ECU types

ECU

« IMMO

TYPE1

-01.96

Wire

Fenix3B, some of

Fenix5 (produced

up to beginning of

the year 1996)

TYPE2

02.96-2001

Wire

Fenix5, SIRIUS32,

IAW 06R,

MSA15.5,

EDC15C3(-2001),

SAFIR, SAFIR2,

Lucas DCU3R, etc

TYPE3

2001-

CAN bus

SIRIUS34,

SIRIUS35, S2000,

EDC15(2001-)

1.2.

Decoding TYPE2 immobilizer system engine ECU

Decoding process is fully automated. On SIEMENS FENIX5 select

Standard type of operation (green LED off). Other systems may require

Advanced1 or Advanced2 mode (especially engine control systems, where

ignition-on signal to ECU is passed via fuel pump relay coil, e.g. SAFIR2).

Decoding in Standard mode takes about 1h 50min, in Advanced 1 – 4h, in

Advanced 2 – more than 5h. In most cases 1h 50min is enough to make

ECU not coded. Ignition is switched from off to on by decoding tool; red

LED indicates ignition on. After decoding, ignition is switched off and

green led is lit permanently.

After decoding, ECU is “virgin” and can be used on another car . If

immobilizer system is ok (valid key), ECU retains new code from

immobilizer control unit after ignition on. Most of decoded ECU can

operate without immobilizer code stored (Fenix5, diesel coded solenoid

valve, some of SIRIUS32, …), other require immobilizer code to be stored.

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1.3.

Decoding TYPE1 immobilizer system engine ECU

Select Semi-Auto operation mode (fast green LED blinking). Press

START button. After every ignition-on, MIL immediately starts to blink

fast. Watch the ECU MIL lamp and count number of ignition-on (start

counting from 1). Note number of ignition-on cycles when MIL stops

blinking for a while. Use Immo1.exe to convert this number to security

code. For ex.: MIL stopped blinking on 89-th ignition-on: program

calculates code 2232.

ECU is not decoded after this procedure; you only found out its

security code! Count number can be in range 1-255. In worst case when

MIL stops to blink on 255-th ignition-on, counting takes about 8 minutes.

Put ECU back to car and turn key to ignition-on. Injection fault lamp

flashes quickly.

1. Depress and keep depressed accelerator pedal fully – injection

fault lamp extinguishes. To enter security code use trip computer button on

the end of wiper control stalk. This button is called ADAC button.

2. Press the button same number of times as the first figure of the

code (injection fault lamp illuminates each time the switch is pressed).

3. Release the accelerator pedal: injection fault lamp flashes.

Repeat operations 1, 2 and 3 to enter in succession the three other

digits of the code. When the code has been entered the injection fault lamp

should be illuminated continuously for 2sec and then must to extinguish.

ECU is no longer protected by immobilizer and is ready to retain new

code. If injection fault lamp flashes, the code is incorrect. Switch off the

ignition, switch it on again and repeat procedure for entering code. Three

attempts to enter incorrect code locks ECU for 15min. It does not accept

any codes during this “penalty” time. Turn ignition ON and wait 15mins.

Procedure for code entering can be performed without car as well.

Accelerator pedal depressing-releasing can be simulated using throttle

position potentiometer connected to the ECU, button must be connected

between ground wire and immobilizer line (see wiring drawings).

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