Code
P1210
CITROEN
P — Powertrain
Fuel pressure regulation electrovalve open circuit
Views:
UK: 3
EN: 7
RU: 9
AI status
Completed
Completed
100%
Causes
- Open or broken wiring between ECU and fuel pressure regulation electrovalve
- Corroded, bent or disconnected connector at the electrovalve
- Faulty electrovalve (coil open)
- Blown fuse or faulty relay supplying the fuel control circuit
- Poor ground or high resistance in ground path
- Intermittent harness damage (pinched, chafed or water ingress)
Symptoms
- MIL/engine warning lamp illuminated
- Engine may enter limp mode / reduced power
- Hard starting or extended cranking
- Rough idle, hesitation or stalling
- Poor fuel economy or abnormal smoke (diesel)
- Stored related fuel pressure or performance fault codes
What to check
- Retrieve full ECU fault memory and freeze frame data with a scan tool
- Visual inspection of electrovalve connector, pins and wiring for corrosion, damage or contamination
- Check related fuses and relays for continuity and correct operation
- Measure supply voltage at the electrovalve connector with ignition ON
- Measure coil resistance across the electrovalve terminals (compare to spec)
- Check continuity between electrovalve connector and ECU pin (wiring continuity)
Signal parameters
- Supply voltage (feed): approx. battery voltage (about 11–14 V) at feed pin with ignition ON
- Control signal: ECU typically uses switched ground or PWM to operate the valve; duty cycle varies with engine demand
- Coil resistance: follow manufacturer specification — typically low‑impedance valves ~1–30 Ω or high‑impedance valves ~40–200 Ω (consult Citroën data)
- Open‑circuit indication: infinite/very high resistance between electrovalve terminals or between terminal and ECU
- Expected ground continuity from electrovalve ground pin to ECU / chassis ground when commanded
Diagnostic algorithm
- Read and record all stored codes and live data. Note fuel pressure values and freeze frame conditions.
- Visually inspect the electrovalve connector, wiring harness and nearby components for damage, corrosion or water ingress.
- Inspect and test related fuses and relays. Replace if faulty.
- With ignition ON (engine OFF), measure battery supply voltage at the electrovalve feed pin. Confirm presence of supply.
- Measure coil resistance across the electrovalve terminals. If resistance is infinite/open, suspect a failed coil or broken internal connection.
- Check continuity between the electrovalve connector and the ECU pin. Repair any open circuits or high resistance.
- Backprobe the control line while commanding the valve with a diagnostic tool to observe voltage/PWM and switching behavior. Use an oscilloscope if available to confirm PWM characteristics.
- If wiring and supply are good but valve behaviour is abnormal, bench‑test the electrovalve (apply known battery voltage and observe operation) or replace the valve.
- If wiring and valve test OK, consider ECU driver fault — verify with wiring short tests and consult manufacturer technical service information before replacing ECU.
- After repair, clear codes and perform a test drive. Re‑check for reappearance of the code and confirm fuel pressure and drivability are normal.
Likely causes
- Broken/open wire or poor connector at the electrovalve
- Electrovalve coil failure (open circuit)
- Faulty fuse/relay or poor ground connection
Fault status
Status
Fuel pressure regulation electrovalve open circuit — electrical open/high resistance detected in fuel pressure regulator solenoid circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email