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• A complete, manufacturer-grade schematic for the Sagem S2000 engine-control unit (ECU) is proprietary and not published freely by Sagem / PSA-Stellantis / Renault.
• What is publicly available are:
– Generic pin-outs of the three 32-way connectors (black A, grey B, brown C).
– Partial wiring diagrams for specific vehicles (Peugeot 206, Citroën Saxo, Renault Clio, …).
– Reverse-engineered PCB layouts and component maps used by ECU-repair workshops.
• To obtain the exact diagram you must reference the vehicle’s VIN (or at least model, year, engine code) in an OEM service portal (Peugeot Service Box, Citroën Service, Renault Dialogys) or buy an official workshop manual.
Key points
Family overview
• 16-/32-bit Siemens C167 MCU, M95080 (or 25020) immobiliser EEPROM, TLE6240/6244 low-side drivers, BIP373/8 ignition transistors.
• Three 32-pin AMP/Tyco connectors → 96 pins total. Colour/letter code depends on harness; PSA usually: A = black, B = grey, C = brown.
| Typical PSA/Renault pin-out (example: Peugeot 206 1.4 TU3JP, SAGEM S2000-3) Black connector A – power, grounds, high-current outputs |
Pin | Function (common) | Notes |
|---|---|---|---|
| A1 | Ignition coil 2-3 driver | Active low | |
| A2 | Injector 2 driver | Active low | |
| A3 | Injector 3 driver | ||
| A4 | Main relay control | Pull-down to ground | |
| A5 | Lambda heater | Via power stage | |
| A6 | Purge canister solenoid | ||
| A7 | Battery +12 V (unswitched) | Keep-alive | |
| A8 | Switched +12 V (after relay) | ECU main supply | |
| A9 | Chassis ground 1 | Bolted to battery GND | |
| … | … | … | |
| A31 | Diagnostic K-line (ISO9141) | Older, non-CAN vehicles | |
| A32 | Chassis ground 2 |
| Grey connector B – analog sensors | Pin | Function | Notes |
|---|---|---|---|
| B1 | Throttle position sensor (TPS) signal | 0.5…4.5 V | |
| B2 | Engine coolant temp (ECT) | NTC sensor | |
| B3 | Intake air temp (IAT) | Shared 5 V pull-up | |
| B4 | MAP sensor output | 0.2…4.8 V | |
| B5 | Knock sensor | Shielded | |
| B6 | 5 V reference | For sensors | |
| B7 | Sensor ground | Low-noise | |
| B8 | Lambda probe signal | 0–1 V | |
| … | … | … | |
| B31 | Crank position sensor + | VR sensor | |
| B32 | Crank position sensor – |
| Brown connector C – actuators, comms, miscellaneous | Pin | Function | Notes |
|---|---|---|---|
| C1 | Ignition coil 1-4 driver | Cyl 1&4 | |
| C2 | Injector 1 driver | ||
| C3 | Injector 4 driver | ||
| C4 | Fuel pump relay out | Pull-down | |
| C5 | Cooling-fan relay | ||
| C6 | A/C clutch relay | Optional | |
| C7 | CAN-High (later variants) | CAN 11-bit, 125 kbps | |
| C8 | CAN-Low | ||
| … | … | … | |
| C31 | Immobiliser line / Rx | To BSI | |
| C32 | Immobiliser line / Tx |
(Exact numbering changes on S2000-10 & S2PM; always cross-check.)
Internal architecture
• Power section: step-down +5 V linear reg, charge-pump for high-side.
• All low-side outputs protected by fly-back diodes & self-reset polys.
• Watch-dog inside C167; if VBAT < 9 V ECU resets, causing crank/no-start.
Common failures
• Ignition driver transistors short (permanent misfire on two cylinders).
• M95080 corruption → immobiliser “start 1 s then stall”.
• Dry joints on relay driver & 5 V reg → random cut-out.
• Repair community now routinely “bench boots” S2000 on the table using:
– +12 V on A8, A7;
– Grounds on A9, A32;
– Ignition sense on A15 (if fitted).
Guide PDF: immo-tools.lt → “Sagem S2000.pdf”.
• Software tools (KTAG, Autotuner, PCMFlash 1.2) support boot-mode via BDM pads exposed after lid removal; C167 requires /BSEC pull-up and INT0 low.
• Immobiliser off / E² hack widely documented; however, EU regulations (Euro 7) and tampering laws make IMMO-OFF repairs illegal on-road in many countries.
• Trend: Most workshops now swap Sagem for newer Bosch ME7/MEV; availability of used ECUs plus cloning services keeps S2000 alive but deemed End-of-Life by PSA.
• Analogy: Think of the three connectors as power rails (A), senses (B), actions & comms (C). Mixing them is like swapping arteries with nerves—results are catastrophic.
• Oscilloscope capture of CKP (B31/B32): ±600 mV sine at crank; missing-tooth decoding inside C167.
• Component map:
– U1: Siemens C167CR-LM (144 QFP)
– U2: Flash ROM 29F400 (in S2000-10)
– U3: ST M95080 (SOIC-8)
– Q1-Q4: BIP373 / Darlington pairs for coils
– U300-series: Infineon TLE6244 quad low-side drivers (injectors, relays)
• Full schematics are copyrighted by Sagem / Stellantis; redistribution without permission infringes IP law.
• Disabling immobiliser or altering emissions control violates EU Regulation 2018/858 and US EPA 40 CFR 86.
• Always observe ESD, high-temp reflow, and vehicle safety (disconnect battery) when servicing ECUs.
• Pin tables are “most common”; Peugeot 307 flex-fuel and Renault K4M engines differ.
• Some PDFs on the web are scans of training slides, not full schematics—interpret carefully.
• If your aim is research/education, reverse-engineering is allowed in many jurisdictions (EU Art 5, USA fair-use), but sharing dumps may not be.
• Compare Sagem S2000 with Siemens SID 801 (diesel) to understand design evolution.
• Investigate migration path to open-source ECU (Speeduino, rusEFI) using the original harness via adapter board.
• Study ISO 14229 (UDS) vs ISO 9141 diagnostics in transition-era ECUs.
Recommended resources
• “diagram_ecu-sagem_s2000.pdf” – comprehensive 19-page wiring set (free).
• Auto-data or HaynesPro – paysite but VIN-filtered.
• Book “Engine Management Advanced Tuning” – generic but valuable for waveform expectations.
The Sagem S2000 ECU schematic is protected, but reliable public pin-outs and partial diagrams exist. Obtain the VIN-specific wiring from OEM portals for guaranteed accuracy, or consult the freely available PDFs and forum threads cited above. Always verify variant and observe legal and safety requirements when diagnosing or modifying the unit.
