Description
Engine Control Unit SIEMENS 2.0 HDI 100kW RHR for PEUGEOT 307 vehicles.
High-quality used Siemens ECU for the 2.0 HDi 100 kW (RHR) engine, suitable for Peugeot 307 applications. This injection control unit is commonly searched by its product numbers and OE references, so listing those codes increases the chance of a reliable match: 5WS40277G-T / 5WS40277I-T, 9655534080, 9660497480, 1940ZA and related references. The unit manages the engine’s common-rail injection strategy to ensure efficient combustion, stable idling and correct fault diagnostics.
Function And Benefits
The ECU controls fuel injection timing, quantity and rail pressure on the 2.0 HDi common-rail system. It also coordinates turbocharger actuation, EGR management, glow-plug control and communicates diagnostic information via the vehicle’s OBD bus. Replacing a faulty ECU restores engine drivability, reduces misfires, eliminates limp-home mode events and clears related fault codes when correctly programmed or cloned.
Technical Information
- Manufacturer: Siemens
- Model: Peugeot 307 2.0 HDi (Engine Code RHR), 100 kW
- Product Codes: 5WS40277G-T, 5WS40277I-T
- Additional Numbers: 9655534080, 9660497480, 1940ZA, 1940ZC, 1942T2, 1942T6
Installation Recommendations
Disconnect the battery before starting work and follow the vehicle manufacturer’s procedures to avoid damage to the unit. Typical replacement steps: locate the ECU (position varies by model year and equipment), unplug connectors carefully, remove mounting fasteners, replace the unit and reconnect. Handle the ECU with anti-static precautions and avoid contact with moisture and excessive mechanical force. After mechanical installation, the unit usually requires data cloning or coding to match the vehicle.
Installation And Coding – Important
- The unit is used and is paired with the original vehicle (VIN/PIN/keys).
- Ways to commission:
- 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.
- It is 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.
Why This Part Fails Most Often
- Water Ingress Or Moisture Leading To Corrosion Of Connectors And Circuitry.
- Thermal Stress And Vibration Causing Solder-Joint Failures Or Component Fatigue.
- Electrical Surges Or Battery Jump-Starts Causing Electronic Damage.
- Software Corruption Or EEPROM Faults Resulting In Erratic Engine Behavior.
Notes For Mechanics And DIYers
This ECU is intended for vehicles equipped with the 2.0 HDi RHR engine. When searching, customers often use OE numbers listed above. For reliable commissioning choose cloning if a direct data copy is possible; otherwise prepare for virginization and full initialization with appropriate PSA diagnostic tools. If you are performing the replacement yourself, prepare basic diagnostic equipment to confirm correct operation after installation and clear any stored fault codes following the chosen commissioning method.
