Code
P1360
CITROEN
P — Powertrain
Ignition coil 4 control short circuit to positive
Views:
UK: 3
EN: 2
RU: 5
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness causing a short to battery positive
- Corroded or bent connector pins at the coil or ECU
- Faulty ignition coil with internal short to +B
- Faulty ECU/ignition driver transistor
- Poor or missing engine/chassis ground
- Water/oil ingress in connector or coil pack
Symptoms
- MIL (check engine light) on
- Rough idle or misfire on cylinder 4
- Reduced power and acceleration
- Increased fuel consumption
- Hard start or intermittent stalling
- Diagnostic trouble code P1360 stored (may be accompanied by misfire codes)
What to check
- Read freeze-frame and other stored codes; note conditions when fault set
- Visual inspection of coil #4 connector and nearby wiring for damage, corrosion or contamination
- Inspect engine and ECU grounds and battery positive feed routing near the harness
- With key ON (engine off) measure voltage at coil control pin and at coil connector power pin
- Disconnect coil #4 connector and see if voltage at control circuit returns to normal or if code clears on re-scan
- Swap coil #4 with another cylinder coil of the same type to see if the fault follows the coil (clear code between tests)
Signal parameters
- Expected at rest (key ON, engine OFF): coil control line near battery voltage (~11–14 V) when not being pulled to ground by ECU
- When running: coil control is typically a pulsed switching signal to ground — a square pulse toggling between ~0–12 V (timing varies with RPM/load)
- Typical coil primary resistance (general reference): ~0.5–3 Ω (check vehicle-specific spec)
- Pulse frequency matches ignition events for that cylinder; duty/frequency will change with RPM
Diagnostic algorithm
- Record all codes and freeze-frame data. Check for related misfire codes (e.g., P03xx).
- Perform a careful visual inspection of the coil #4 connector, wiring harness routing, and nearby +12V circuits for chafing, pin corrosion, crushed insulation, fluid contamination, or recent repairs.
- With connector attached and key ON (engine off), measure voltage at the coil control pin and at the coil power pin. Note if the control line is hard at +12V (indicating a short to positive) or being switched to ground.
- Disconnect the coil #4 connector. Measure continuity from the coil control wire to battery +12V and to chassis ground. A direct short to +12V indicates wiring/connector problem.
- Swap coil #4 with another known-good coil of the same type. Clear codes and run engine to see if the DTC follows the coil. If it follows, replace the coil.
- If the fault remains with the wiring position after swapping, trace and repair the harness (repair insulation, replace damaged section, clean/replace connector pins).
- If wiring and coil are good but control wire still shorted to +12V at the ECM connector, test continuity between coil connector and ECM. If a short exists in the harness near the ECM, repair harness. If harness is good and the control pin at the ECM is shorted to +12V, consider ECM driver failure and consult manufacturer guidance before replacing ECU.
- After repair, clear codes and road-test to confirm repair. Re-scan and verify no return of the fault.
Likely causes
- Wiring harness damage where the coil control wire contacts a fused +12V feed
- Corroded/contaminated coil connector pin creating a high-voltage path to +B
- Faulty ignition coil internal short
- ECM driver failure (less common)
Fault status
Status
Ignition coil 4 control circuit is shorted to positive battery voltage; ECM cannot properly switch the coil to ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 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