Code
P1345
DAEWOO
P — Powertrain
#5 ION CIRCUIT
AI status
Completed
Completed
100%
Causes
- Open or short in #5 ion sensor wiring or connector
- Faulty ignition coil or ion sensing element for cylinder 5
- Damaged or fouled spark plug on cylinder 5
- Poor ground or power supply for ignition/ion circuit
- Corroded or loose connector at coil, harness, or ECM
- Intermittent connection due to wiring chafe or heat damage
Symptoms
- MIL (Check Engine Light) illuminated
- Intermittent or steady misfire on cylinder 5, rough idle
- Reduced engine power and drivability issues under load
- Poor fuel economy and increased emissions
- Possible difficulty starting or hesitation during acceleration
- Code P0305 (misfire cylinder 5) or multiple misfire codes may accompany P1345
What to check
- Retrieve freeze frame data and related codes (e.g., P0305, P0355) with a scan tool
- View live ion-sensing or ignition-related data for cylinder 5 if available (ionic current trace or misfire counters)
- Visually inspect wiring and connectors for coil #5 and associated harness for damage, corrosion, heat chafe
- Inspect spark plug and ignition coil for physical damage or carbon tracking
- Check for loose or corroded engine ground connections and power supply to ignition module
- Perform a basic ignition test: swap coil #5 with a known-good coil and see if the code follows the coil (only if coils are plug-and-play)
Signal parameters
- Expected: a repeatable ion current/ignition event pulse for cylinder 5 coincident with the spark/ignition timing
- Normal waveform: short pulse at each combustion event; amplitude and shape vary with load and system design
- Abnormal: flatline (no pulses), intermittent pulses, or noisy/distorted waveform
- Pulse frequency correlates to engine RPM (one pulse per combustion event for that cylinder)
Diagnostic algorithm
- Connect a scan tool, record freeze frame and stored data. Note related codes (misfire or ignition coil circuits).
- Clear code and perform key-on/crank and run test to see if P1345 returns. Watch live ion or misfire data for cylinder 5.
- Visually inspect coil #5, spark plug, connector and harness for damage, corrosion, or carbon tracking. Repair obvious issues.
- Swap coil #5 with another known-good cylinder coil. If the code moves to the other cylinder, the coil is likely faulty. If it stays on #5, suspect wiring or ECM.
- Inspect continuity and resistance of the ion/secondary wiring and connector to the coil and ECM. Repair any open/short/poor connection. Check engine ground(s).
- Check spark plug condition and gap; replace if fouled, damaged, or out-of-spec. Re-test.
- Probe the ion/ignition signal with an oscilloscope or lab scope (if available) to verify presence and quality of ion pulses at cylinder 5 during cranking and running. Compare to a known-good cylinder.
- If wiring and coil/plugs test good and signal still absent, consider ECM/ignition module internal fault—verify power/ground at ECM and consult manufacturer service info before ECM replacement.
- After repairs, clear codes and perform a road/test cycle to confirm the fault does not return.
Likely causes
- Broken or shorted ion/secondary wiring to coil #5
- Failed ignition coil or coil pack on cylinder 5
- Worn, damaged, or incorrectly gapped spark plug in cylinder 5
- Corroded connector pins at the coil/plug or ECM pin for the ion circuit
- Loose engine ground affecting the sensing circuit
Fault status
Status
Cylinder #5 ionization sensing circuit malfunction detected. Possible open/short/poor connection, faulty ignition coil/plug, or ECM/ground issue causing loss or distortion of ion signal.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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