Description
SAGEM Engine Control Unit for Citroën Xsara Picasso 1.8 16V
Product Overview
This SAGEM ECU (S2000-1) is designed for Citroën Xsara Picasso 1.8 16V engines and is commonly referenced by part numbers 9644674980 and 9647007580. It is a direct-fit engine management unit that controls key engine functions to ensure smooth running, correct fueling and emissions compliance. Suitable for professional workshops and experienced DIY mechanics searching by product code.
Technical Information
- Manufacturer: SAGEM
- Model: Citroën Xsara Picasso 1.8 16V
- Product Codes: 9644674980, 9647007580
- Additional Numbers: S2000-1, 1938FG, NFP
Functions
The ECU manages fuel injection timing and duration, ignition timing, idle control and diagnostics. It processes inputs from engine sensors (temperature, airflow/pressure, throttle position and oxygen sensors) and adjusts injectors and ignition to optimize performance, fuel economy and emissions. Fault codes stored by the unit are readable via standard diagnostic tools.
Common Failure Causes
- Moisture ingress and corrosion of connectors or PCB tracks.
- Thermal stress and aging of electronic components or solder joints.
- Voltage spikes, poor grounding or damaged wiring causing component failure.
- Physical damage from impacts or improper handling during removal/installation.
Replacement Procedure
Basic replacement steps for experienced technicians:
- Disconnect the negative battery terminal before starting to avoid electrical damage.
- Locate the ECU according to vehicle documentation (position can vary by build and may be in the engine bay or interior mounting points).
- Carefully unplug all wiring connectors, release any retaining clips and remove mounting fasteners.
- Install the replacement unit in reverse order. Ensure connectors are clean and fully seated.
- After mechanical installation, perform the required programming or cloning procedure described below to restore full functionality.
Installation And Coding – Important
- The Unit Is Used And Is Paired With The Original Vehicle (VIN/PIN/Keys).
- Options For Commissioning:
- Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
- Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
- Recommended To Be Performed By A Specialist With PSA Service Equipment (DiagBox/Lexia/PP2000).
- Before Removal/Installation Always Disconnect The Battery And Follow The Manufacturer Procedure To Avoid Damaging The Unit.
Installation Recommendations
Ensure all connectors and pins are free of corrosion and that mating surfaces are clean. Verify vehicle charging system voltage is stable before and after replacement. If possible, inspect wiring loom and ground points for damage. Use appropriate tools and ESD precautions when handling electronic modules.
Why Choose This Unit
Searching by the supplied product numbers (9644674980, 9647007580) and common identifiers (S2000-1) makes it faster to locate the correct ECU for Citroën Xsara Picasso 1.8 16V. This unit restores proper engine management when a faulty ECU is causing drivability issues, fault codes, poor fuel economy or starting problems.
Notes For Mechanics And DIYers
This listing emphasizes compatibility by part number and model. For seamless commissioning, plan for cloning or initialization with appropriate PSA diagnostic tools. Follow safety precautions when working with electrical systems and consult vehicle repair documentation for vehicle-specific procedures.
