Code
P02D9
LAND ROVER
P — Powertrain
Cylinder 7 - Fuel injector compensation learning maximum limit
Views:
UK: 17
EN: 20
RU: 15
AI status
Completed
Completed
100%
Causes
- Faulty or degraded fuel injector on cylinder 7
- Injector wiring harness damage, high resistance, or poor connector/ground
- Low or irregular fuel rail pressure or supply issues
- Mechanical engine problems (low compression, valve issues, intake/exhaust leaks)
- Incorrect injector calibration or previous improper injector replacement
- ECM software bug or internal fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or vibration, especially at idle
- Reduced engine power, hesitation or surging
- Cylinder-specific misfire codes (intermittent or persistent)
- Increased fuel consumption or increased emissions
- Possible hard start or cold start roughness
What to check
- Read and record freeze frame data and related pending/permanent codes
- Check live data: cylinder contribution, long-term/short-term trims, injector compensation values
- Verify fuel rail pressure and fuel supply under load and cranking
- Inspect injector connector and wiring for damage, corrosion, or loose pins
- Measure injector coil resistance and compare to specification
- Perform a cylinder balance or contribution test and note change when disabling cylinder 7
Signal parameters
- Injector commanded pulse width (ms)
- Injector learned compensation or adaptation value (percent or µs)
- Cylinder contribution / balance rate
- Short-term and long-term fuel trim (overall and per-bank if available)
- Fuel rail pressure (bar/psi)
- Injector driver current/voltage (if accessible)
Diagnostic algorithm
- Record all relevant DTCs, freeze frame and live data. Note whether code is historic or current.
- Clear codes and perform a road or drive-cycle test to re-create the fault and capture live injector adaptation values.
- Visually inspect wiring, connector, and ground for cylinder 7 injector. Repair any damage and re-test.
- Measure injector coil resistance and compare to spec. If out of range, replace injector.
- Use a scope or current clamp to observe injector waveform while cranking/running; compare with a known-good cylinder.
- Swap the cylinder 7 injector with another cylinder and see if the adaptation fault follows the injector (confirms injector vs wiring/ECM).
- Check fuel rail pressure under static and dynamic conditions; inspect fuel filter, pump, and regulator for faults.
- Perform compression or leak-down test on cylinder 7 to rule out mechanical causes (rings, valves, head gasket).
- Verify cam/crank timing and camshaft position sensors if timing-related symptoms or codes exist.
- If injector and cylinder mechanical condition are good, consult manufacturer service information for adaptation/learning procedure and ECM software updates; perform injector compensation reset/relearn per procedures.
- If problem persists after replacing injector and repairing wiring, consider ECU/PCM diagnosis or replacement as last resort.
Likely causes
- Injector mechanical failure (sticking, leaking, poor spray pattern)
- Open/short/poor connection in injector supply, driver, or ground circuit
- Fuel pressure regulator or supply pump underperforming
- Cylinder-specific mechanical fault (compression low, valve seating)
- ECM reached adaptation limits after repeated misfire/fueling corrections
Fault status
Status
Cylinder 7 fuel injector compensation learning reached maximum limit — ECM can no longer adapt fueling for injector 7. Investigate injector, wiring, fuel supply and cylinder mechanical condition.
Repair difficulty: Medium
Diagnostic time: 1.5 - 4 hours
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