P1293 — Injector 2 control malfunction

Diagnostic algorithm

1. Confirm code and record freeze-frame/live-data (RPM, load, engine temp, battery voltage).
2. Visually inspect injector 2 connector, wiring looms, and pins for damage, corrosion, or water ingress. Repair any obvious defects.
3. With ignition OFF, measure DC resistance of injector 2 between its electrical terminals and compare to service data or to the same-spec injector on another cylinder. For piezo injectors follow manufacturer test. Do NOT rely solely on ohmmeter for piezo types.
4. With ignition ON (engine off), check for proper battery/ignition voltage at the injector supply terminal and check for good ground path.
5. Start engine or crank and back-probe the injector control wire with a scope to confirm ECU is commanding pulses. Look for clean switching waveform and expected pulse width. If no pulse, suspect wiring or ECU driver.
6. Perform a continuity check from ECU injector output pin to injector connector pin to confirm no open; check for shorts to battery or ground and to adjacent circuits.
7. Perform a wiggle test of harness while monitoring live data or scope to detect intermittent faults.
8. If electrical supply and command are good and injector shows abnormal resistance or fails functional test, remove and bench-test the injector or replace with a known-good unit. On modern common-rail systems, use manufacturer-specified injector test/cleaning procedures.
9. If injector tests good and wiring checks are good but no command from ECU, consider ECU driver failure — confirm with manufacturer diagnostic flow and consider ECU repair/replacement.
10. Clear codes and re-test road/engine run to confirm repair; monitor for recurrence before declaring repaired.