The Peugeot 407, produced between 2004 and 2011, remains a popular choice in the used car market, largely due to its distinctive styling and the robust nature of its diesel engines. Among these, the 2.0 HDi (High Pressure Direct Injection) engine stands out as a workhorse. However, as these vehicles age, electrical gremlins are becoming the number one cause of breakdowns and frustration for owners.
Specifically for the 2.0 HDi, this is often a Siemens or Bosch unit that controls fuel injection (Y3), the turbocharger (B105/Y68), and the pre-heat system (1150). peugeot 407 2.0 hdi wiring diagram
On the diagram, find the two wires from the crankshaft sensor to ECU pins and B62 . Set your multimeter to AC voltage (or an oscilloscope if possible). While cranking, you should see a small fluctuating signal (0.5V - 5V AC). No signal = no injection pulse. The Peugeot 407, produced between 2004 and 2011,
| Symptom | Likely wiring fault | Check | |---------|--------------------|-------| | No communication with ECU | CAN bus break, missing 12V at ECU pin A2 | Check F8 in PSF2, measure CAN resistance (60Ω across 6-14) | | Cranks but no start | No RPM signal | Check crankshaft sensor wiring continuity & shielding | | Injector circuit fault (P0201-4) | Broken wire near injector connector | Inspect engine harness near cylinder head – heat damage | | EGR stuck code | Feedback signal open circuit | Check 5V reference at EGR – often shorted to ground | | Glow plug light flashing | Relay control wire open | Relay located on PSF1 – pin B3 from ECU | | Fan runs continuously | PWM wire shorted to ground or ECU driver failed | Check ECU pin G1 to fan module | Specifically for the 2
Most wiring issues on this model stem from the or the Under-bonnet Fuse Box (PSF1) . 🔌 Core Electrical Systems
Before diving into specific diagrams, it is crucial to understand that the Peugeot 407 is a modern vehicle reliant on a Controller Area Network (CAN bus) system. Unlike older cars where a wire ran directly from a switch to a component (e.g., from the window switch to the window motor), the 407 uses a multiplexed system.
