P1230 — Fuel injector, cylinder 6

Diagnostic algorithm

1. Retrieve full fault list and freeze-frame data; note engine conditions when fault set.
2. Verify misfire/cylinder contribution for cylinder 6 with scan tool. Confirm fault is repeatable.
3. Visually inspect the harness and connector for cylinder 6; repair any damage and clean corrosion.
4. With ignition off, measure injector coil resistance and compare to Porsche specifications. If out of range, replace injector.
5. Back-probe the injector connector while cranking/idle: verify constant battery feed and pulsed ground signal from ECM. Record waveform if possible.
6. Check for proper fuel rail pressure and injector feed. Low rail pressure can mimic injector faults.
7. Perform an injector balance or cylinder cut-out test (disable injector 6 briefly) and observe RPM/fuel trim change to assess hydraulic function.
8. Swap injector 6 with a known-good injector from another cylinder if practical, then re-scan to see if the code or symptom follows the injector (exercise caution and document orientation).
9. If the fault follows the wiring or remains after injector swap, check continuity between injector connector and ECM pin; inspect and test ECM driver if wiring is good.
10. If electrical tests pass and injector is hydraulically suspect, remove and bench-test or replace the injector. Re-test after repair.
11. Safety note: relieve fuel pressure before disconnecting fuel lines or injectors. Take fire safety precautions when working with fuel.