P1338 — Cylinder 2 ignition fail malfunction

Diagnostic algorithm

1. Retrieve all codes and freeze-frame; note conditions when fault occurred (RPM, load, temp).
2. Perform a visual inspection of ignition components for cylinder 2 (coil, plug, boot), wiring and connectors; repair obvious damage or corrosion.
3. Swap the ignition coil (or coil-on-plug) from cylinder 2 with another known-good cylinder. Clear codes and run engine. If fault follows the coil, replace coil.
4. Inspect and, if suspect, replace the spark plug in cylinder 2; verify correct type and gap.
5. With a multimeter, check supply voltage to the coil connector (battery voltage with key on/crank) and continuity to ECU ground/driver. Repair wiring as necessary.
6. Use an oscilloscope to examine coil primary/secondary waveforms while cranking/running to confirm proper spark energy and timing. Compare to reference waveforms.
7. Test injector operation for cylinder 2 (resistance, activation, spray pattern if accessible) and check fuel pressure if multiple cylinders affected.
8. If electrical and fuel systems test OK, perform a compression or leak-down test on cylinder 2 to evaluate mechanical condition.
9. Check crank/cam sensor signals and timing correlation if misfire occurs with timing anomalies.
10. After repairs, clear codes and perform a test drive under conditions that previously triggered the fault; re-scan to confirm resolution.
11. Safety note: When checking spark be cautious to avoid shock and follow safe procedures; prefer using diagnostic tools (scope/inductive pickup) over exposed spark testing.