High-quality Engine Control Unit (ECU) originally fitted to small PSA petrol models. This Magneti Marelli IAW 48P2.7H unit (references 9646570280, 9645989480, 1938VY) manages fuel injection, ignition timing and basic engine diagnostics for 1.1i engines. Ideal for professional workshops and experienced DIY mechanics who look for a direct-fit injection ECU solution for Citroën C2 and related models. Clear listing of part numbers and application codes helps fast identification in searches and speeds up repairs.

Technical Information

• Manufacturer: Magneti Marelli
• Model: Citroën C2 1.1i (common application), Citroën C3 1.1i (where compatible)
• Product Codes: 9646570280, 9645989480
• Additional Numbers: IAW 48P2.7H, 1938VY

Function And Benefits

The ECU controls air/fuel mixture and ignition advance using inputs from sensors (MAP/MAF, throttle position, coolant temperature, crankshaft position). Proper operation ensures smooth idling, drivability and optimized fuel consumption. Replacing a faulty ECU restores engine management functions, removes fault codes related to injection and ignition, and can eliminate drivability problems such as stalling, misfires or poor acceleration.

How To Replace

1. Disconnect Battery Negative Terminal Before Any Work To Prevent Short Circuits Or Damage To Electronic Components.
2. Locate The ECU Typically Under The Dashboard Or In The Engine Bay Depending On Model; Remove Any Trim Or Covers.
3. Unplug Electrical Connectors Carefully, Release Securing Clips And Remove Mounting Screws.
4. Fit Replacement Unit, Securely Fasten Mounting Screws And Reconnect Connectors Ensuring Pins And Seals Are Clean.
5. Follow Commissioning Procedure (Cloning Or Initialization/Coding) As Described Below Before Final Test Drive.

Installation And Coding – Important

• The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
• Options For Commissioning:
  1. Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
  2. Virginisation 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 Manufacturer Procedures To Avoid Damaging The Unit.

Installation Recommendations

Work In A Clean, Dry Environment To Avoid Contamination Of Connectors. Inspect Wiring Harness And Ground Points For Corrosion Or Damage Before Reinstallation. Use Correct Tools And Torque Settings For Fasteners. After Commissioning Run Full System Checks And Clear Old Fault Codes, Then Perform A Test Drive To Confirm Normal Operation.

Why This Part Most Often Fails

Common Failure Causes Include Moisture Ingress And Corrosion At Connectors, Thermal Stress From Engine Compartment Heat Cycles, Poor Battery Or Charging System Voltage Causing Electronic Damage, And Physical Impact Or Water Damage. Faulty Grounds Or Intermittent Wiring Can Cause Erratic Behavior That Mimics ECU Failure, So Inspect The Vehicle Wiring Thoroughly When Diagnosing.

Suitable For

Primarily Intended For Citroën C2 1.1i Applications Using The IAW 48P2.7H Platform. May Also Fit Other Small PSA Vehicles With Matching Part Numbers (9646570280 / 9645989480 / 1938VY). Match The Unit Numbers Shown Above Before Installation.

Keywords: Magneti Marelli IAW 48P2.7H, ECU, Engine Control Unit, 9646570280, 9645989480, 1938VY, Citroën C2, Citroën C3, Injection Control Unit

Engine Control Unit Magneti Marelli IAW 48P2.72 – Genuine Used O.E.M. solutions for PSA cars. The unit with the numbers 9648568480 and 9645989480 (PSA) comes from a 2003 Citroën C3 1.1i. The ideal replacement for a faulty ECU on a 1.1 8V engine when you need to quickly get the car back into service without modifying the wiring. NFP – the part is discontinued, therefore the original used unit is often the only realistic option.

Technical information
– Manufacturer: Magneti Marelli
– ECU designation: IAW 48P2.72
– OEM/PSA numbers: 9648568480, 9645989480 (often also listed as 96 485 684 80 / 96 459 894 80)
– Fuel / type: petrol, injection and ignition control unit (ECU/PCM)
– Donor vehicle: Citroën C3 1.1i, year 2003
– Engine type: usually TU1JP (HFX) 1.1 8V – check with part number
– Connector: 1x multi-pin (48pin)
– Category: injection control units (ECU)

Compatibility
– Citroën C3 1.1i (approx. 2002-2005) – verify IAW 48P2.72 and PSA numbers
– Citroën C2 1.1i (selected years) – always confirm compatibility by matching the codes on the label
– General rule: IAW index and PSA/OEM numbers match is decisive; check the year and engine type on the label of the old ECU

What to watch out for during assembly
– Immobilizer/BSI: The ECU is paired with the vehicle. After assembly, it is necessary:
– either clone the contents of the original drive to this one (transfer data/EEPROM),
– or put the unit in “virgin” state and pair with diagnostics (e.g. DiagBox/PP2000) according to the vehicle’s PIN.
– Compare before ordering:
– marking IAW (48P2.72),
– PSA numbers (9648568480 / 9645989480),
– design of the connector.
– Recommendation: Check compatibility by VIN and part numbers or consult diagnostics/service.

Typical symptoms of a faulty original ECU when you use this unit
– Engine not starting, immobilizer errors
– Ignition or injection failures, irregular idling
– ECU fault codes cannot be cleared / keep coming back

Condition and packaging
– Used original part from disassembly, see photo for condition
– Package contents: 1x engine control unit (ECU)

Key search words
– Engine control unit Citroën C2 C3 1.1
– ECU Magneti Marelli IAW 48P2.72
– 9648568480, 9645989480, PSA injection unit
– ECU Citroën/Peugeot 1.1 TU1JP HFX, NFP original part

Description

This Magneti Marelli IAW 48P2.7H engine control unit (ECU) is a direct-fit electronic control module originally removed from a Citroën C2 1.1i. It is an ECU commonly referenced by part numbers and codes such as 9655756780, 9645989480 and 1938VY / 1938.VY. The unit manages fuel injection, ignition timing and related engine sensors to ensure correct engine running, drivability and emissions compliance on compatible Citroën models. Ideal for professional workshops and experienced DIY mechanics searching by part number, this ECU is offered as a replacement for vehicles with matching hardware and software requirements.

Technical Information

• Manufacturer: Magneti Marelli
• Models: Citroën C2 (1.1i), Citroën C3 (applications with the same ECU code)
• Product Codes: 9655756780, 9645989480, 1938VY
• Other Numbers: IAW 48P2.7H, 1938.VY, (Reference Fault Code Often Associated: P0606)

Compatibility And Identification

Mechanics commonly search for this unit by its code (IAW 48P2.7H) or OEM numbers listed above. Before installation, compare the ECU’s label codes and connector layout with the original module to confirm mechanical match. This unit is typically used on small-displacement Citroën petrol engines (1.1i) of the same generation; cross-referencing part numbers is the fastest way to identify compatibility.

Replacement Procedure (Overview)

Replacing the ECU is straightforward for a trained technician but involves security and coding steps. Typical replacement workflow:

1. Disconnect the negative battery terminal and wait a few minutes to ensure systems power down.
2. Locate and remove trim/paneling to access the ECU (usually in the engine bay or dash area depending on model).
3. Carefully unplug electrical connectors—do not force or bend pins—and remove retaining screws or brackets.
4. Install the replacement unit, securing connectors and brackets; reconnect battery only after physical installation is complete.
5. Perform cloning or initialization/coding to match the vehicle immobilizer and settings (see Installation And Coding – Important).

Installation And Coding – Important

• The unit is used and is paired with the original vehicle (VIN/PIN/keys).
• Options To Commission:
  1. Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
  2. 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).
• Always disconnect the battery before removal/installation and follow the manufacturer’s procedure to avoid damaging the unit.

Installation Recommendations

• Handle the ECU by its housing; avoid touching circuit boards or connector pins.
• Use the correct torque for mounting screws and ensure connectors fully click into place.
• After installation, clear stored fault codes and verify sensor inputs and actuator outputs with a diagnostic tool.
• Perform immobilizer/key adaptation or cloning as required so the engine will start and run reliably.

Why This Part Commonly Fails

Typical causes of ECU failure include moisture ingress and corrosion at connector pins, electrical surges from battery events or improper jump-starts, thermal stress and failed solder joints or components inside the module. Software corruption or EEPROM/processor faults can trigger diagnostic trouble codes such as P0606 (processor fault). In many cases symptoms are intermittent stalling, no-start, multiple engine management warning lights, or erratic sensor readings. Addressing root causes (corroded harness, poor grounding, battery issues) is crucial to prevent repeat failures.

Who Should Fit This Unit

Recommended for professional auto electricians and experienced DIY mechanics comfortable with ECU removal, electrical diagnosis and vehicle coding. Proper diagnostic equipment and knowledge of PSA vehicle procedures will ensure correct commissioning and reliable operation.

This engine control unit is compatible with Citroën C2 1.1i vehicles and features part numbers 9646570280, 9645989480, and 1938VY. Regular wear and tear can lead to failure of the engine control unit, which may cause issues such as reduced engine performance, increased fuel consumption, or even engine stalling. It’s recommended to monitor the performance of your vehicle and replace the engine control unit as needed to maintain peak performance.

Technical Information

• Manufacturer: MAGNETI MARELLI
• Model: IAW 48P2.7H
• Product Codes: 9646570280, 9645989480
• Other Numbers: 1938VY

Replacing the engine control unit is a straightforward process, typically involving disconnecting the battery, removing the faulty unit, and installing the new one. Always consult your vehicle’s service manual for specific instructions to ensure a proper installation.