Code
P1342
DAEWOO
P — Powertrain
#2 ION CIRCUIT
Views:
UK: 1
EN: 4
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or short in the ion-sensor/ignition secondary wiring for cylinder 2
- Corroded, loose, or damaged connector at the ignition coil or harness
- Faulty ignition coil or internal ion-sensing circuit in the coil
- Bad spark plug or fouled electrode preventing proper ion current
- Contamination (oil, carbon) on ignition components reducing ion signal
- Poor ECU ground or power supply to the ion sensing circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Stored P1342 and possibly related misfire codes (e.g., P0302)
- Rough idle or intermittent misfire on cylinder 2
- Reduced engine performance, stumbling or hesitation
- Poor fuel economy
- Difficulty starting (less common) or intermittent drivability issues
What to check
- Read and record freeze frame and all stored codes with a capable scan tool
- Visual inspection of coil, spark plug, high-tension lead (if equipped), connector and wiring for cylinder 2
- Compare coil connector pins and harness for corrosion, bent pins, or water ingress
- Check battery voltage and main engine grounds
- Swap cylinder 2 coil with another cylinder’s coil (if coils are identical) and see if code follows the coil
- Inspect and/or replace the spark plug for cylinder 2; check gap and condition
Signal parameters
- Ion-current/ionization pulses occurring immediately after ignition event for the cylinder
- Waveform timing should coincide with spark event and combustion window
- Expected amplitude: small ion/current pulses (manufacturer-specific; typically microamp to milliamp range when converted)
- Signal noise, missing pulses, or flatline indicates open/short/fault or lack of combustion in that cylinder
- Primary coil voltage/secondary waveform should show normal spark energy when coil is healthy
Diagnostic algorithm
- Connect a professional scan tool, read codes and freeze-frame data. Note any related misfire or ignition codes (e.g., P0302).
- Perform a visual inspection of the cylinder 2 ignition coil, connector, wiring harness and spark plug. Repair or replace damaged connectors/wiring.
- Swap the coil from cylinder 2 with a known-good cylinder. Clear codes and run the engine. If code moves to the other cylinder, the coil is likely bad.
- Inspect/replace the spark plug on cylinder 2. Confirm correct gap and no heavy fouling or shorting.
- Check continuity and resistance of wiring between the coil connector and the ECU. Repair shorts, opens, or high resistance connections.
- Verify proper power and ground to the coil and ECU. Clean and tighten grounds and battery connections.
- Use an oscilloscope or advanced ignition diagnostics to view the ion/secondary waveform on cylinder 2 and compare with a good cylinder. Look for missing pulses or abnormal shape.
- If wiring, coil and spark plug pass tests but fault remains, consider ECU-related failure or software issue; consult OEM bulletins and consider ECU testing/replacement as a last step.
- After repairs clear codes and perform a test drive/drive cycle to confirm the fault does not return.
Likely causes
- Damaged ignition coil for cylinder 2 (internal ion sensor failure)
- Damaged or shorted secondary wiring/harness for cylinder 2
- Loose or corroded connector at the coil or ECM pin
- Worn or incorrectly gapped spark plug on cylinder 2
- Intermittent ground or power supply fault to the ion sensing circuitry
Fault status
Status
Manufacturer-specific trouble code indicating a fault in the ion/ionization sensing circuit for cylinder #2. The ECU is not receiving a valid combustion/ion signal from that cylinder.
Repair difficulty: Medium
Diagnostic time: 1-2 hours
Similar codes
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