P22E1

Code

Generic P — Powertrain

Cylinder 3 Alternative Fuel Injector Control Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 36 RU: 40

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Page language: EN

Causes

Open or broken wiring in injector control circuit (pin-to-pin break)
Corroded, loose, or damaged connector at the injector or ECM
Failed alternative-fuel injector (open coil)
Blown fuse or failed relay supplying injector circuit
PCM/ECM driver fault (rare)
Aftermarket or repair wiring incorrectly installed

Symptoms

Check Engine / Malfunction Indicator Lamp (MIL) illuminated
Rough idle or misfire at cylinder 3
Reduced engine power, hesitation or poor acceleration
Increased fuel consumption or poor alternative-fuel operation
Difficulty starting or engine stall (under some conditions)
Stored misfire or fuel-system related fault codes

What to check

Use a scan tool: read freeze-frame, readiness, related codes and live data for cylinder 3 injector command and feedback
Visually inspect wiring and connectors for cylinder 3 alternative fuel injector for damage, corrosion, or loose terminals
Confirm battery voltage at ignition ON is present at the injector supply pin(s)
Measure injector coil resistance with the connector disconnected (compare to spec)
Backprobe the injector control wire while cranking/commanding to verify switching (pulse) and voltage levels
Perform a wiggle test on harness while monitoring injector command to locate intermittent opens

Signal parameters

Injector coil resistance: typical ranges 1–20 Ω (many low‑impedance injectors ~2–5 Ω; high‑impedance ~12–16 Ω) — consult vehicle spec
Supply voltage to injector: battery voltage (≈11–14 V with engine running) at the constant feed
Control signal: pulsed switching from ECM. Typical pulse widths vary with load (≈1–20 ms) and frequency increases with engine speed
Expected command voltage behavior: (low‑side switching) ~12 V at idle with circuit open, pulled to ~0 V when energized; (some systems use high‑side switching) behavior will be reversed — verify with wiring diagram
No continuity (open) between injector control pin and ECM driver pin indicates an open circuit

Diagnostic algorithm

Safety: park on level ground, set parking brake, disconnect battery only if required by manufacturer procedures. Use proper PPE.
Retrieve codes and freeze‑frame with an OBD-II scan tool. Note related codes (misfire, fuel system, ECM).
Visually inspect connector, wiring, and harness for cylinder 3 alternative-fuel injector. Repair or clean any damage/corrosion.
With ignition ON (engine OFF), verify battery supply voltage at the injector feed terminal. If missing, trace fuse/relay and repair.
Disconnect the injector and measure coil resistance. Compare to manufacturer specification. An open reading indicates a failed injector.
Backprobe the injector control lead while commanding the injector with a scan tool or while cranking. Observe for pulsed voltage or switching. No pulse = open/ECM output fault.
Check continuity between the injector connector and the ECM driver pin. Repair broken wiring if continuity is not within spec.
Perform a wiggle/stress test on the harness and connector while monitoring command signal to find intermittent faults.
If wiring and injector test good, swap the alternative-fuel injector with another cylinder (if compatible) to see if the fault follows the injector. Note: take precautions and clear codes between swaps.
If the fault follows the injector, replace the injector. If it follows the harness/ECM connector, repair wiring or replace the ECM as a last resort after verifying outputs with a known-good module or manufacturer guidance.
After repair, clear codes and perform a road test and re-scan to confirm the fault does not return. Document test results and repairs.

Likely causes

Damaged harness or chafed insulation near engine or cylinder 3 area
Connector corrosion or bent pins at cylinder 3 injector
Failed cylinder 3 alternative fuel injector coil (open)
Lost power supply or ground for the alternative fuel injector bank
Intermittent wiring break revealed under vibration

Fault status

⚠️ Status

P22E1 set when the engine control module detects an open or broken control circuit to the cylinder 3 alternative-fuel injector. The fault indicates the injector is not being properly commanded or the circuit is open between the ECM and the injector.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours