Code
P1341
DAEWOO
P — Powertrain
#1 ION CIRCUIT
Views:
UK: 2
EN: 19
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in #1 ion sensor/ignition coil harness
- Loose, corroded, or damaged connector at coil/ECU
- Faulty ignition coil or coil pack with integrated ion sensing
- Damaged or fouled spark plug for cylinder 1
- Poor ground or supply voltage to coil/ion circuit
- Aftermarket ignition components incompatible with ion sensing
Symptoms
- MIL/Check Engine light illuminated
- Misfire indication for cylinder 1 or cylinder-specific misfire codes
- Rough idle and reduced engine performance
- Decreased fuel economy
- Hard starting or hesitation under load
- Intermittent faults or drivability issues correlated with engine run time or vibration
What to check
- Read DTCs and freeze frame data; note cylinder and related codes (e.g., misfire codes P0301)
- Visual inspection of wiring and connectors at cylinder 1 coil and ECM for damage, corrosion, loose pins
- Inspect spark plug condition and gap on cylinder 1
- Swap cylinder 1 coil/igniter with another cylinder’s coil to see if code follows the coil
- Measure supply voltage and ground at the coil connector with engine off and cranking
- Probe ion-signal terminal with an oscilloscope (or lab scope) to check for expected pulses synchronized with ignition
Signal parameters
- Ion-sensing signal: low-level pulsed current/voltage produced during and just after spark; appears as brief pulses synchronized to ignition event
- Typical amplitude: small millivolt-level pulses (varies by system); should show consistent pulse per ignition cycle at idle and proportional rate with RPM
- Reference: stable +12 V supply to coil (or manufacturer-specific coil supply) and a reliable ground; ion return is usually sensed on a dedicated wire to ECM
- An open circuit shows no pulses; a short to ground/12V shows constant low or saturated level instead of pulses
- Waveform: one pulse per firing event, repeatable and similar amplitude among cylinders when healthy
Diagnostic algorithm
- Verify the code: connect scan tool, record freeze frame and live data. Note if P1341 is current or historic and any accompanying misfire codes.
- Visual inspection: with ignition off disconnect battery negative terminal, inspect harness for rubbing, heat damage, melted insulation, or corrosion at connectors (coil and ECM). Repair any visible issues.
- Check connectors/pins: disconnect cylinder 1 coil connector, inspect pins for damage/corrosion, clean and properly seat connector.
- Spark plug & coil check: remove and inspect #1 spark plug for fouling, damage, or incorrect gap; replace if doubtful. If coil packs are serviceable, swap coil with another cylinder to see if fault moves.
- Power/ground verification: with key on (engine off) measure coil supply voltage and ground continuity. Confirm proper battery voltage at the coil power terminal and good ground; repair as needed.
- Signal measurement: use an oscilloscope to probe the ion-signal terminal (or low-voltage measurement method per service manual). Observe pulses during cranking and running. Compare to a known-good cylinder or factory waveform.
- Wiggle test: with engine running or cranking, carefully wiggle wiring and connectors to reproduce the fault—watch for dropout or changes in signal/MIL.
- ECU check: if wiring, connectors, coil, and spark plug test good but signal absent or erratic, check ECM inputs and grounds. Consult wiring diagram and perform back-probing continuity tests to ECM. Replace ECM only after exhausting harness and component checks.
- Clear codes and test drive: after repairs or component swaps clear codes and verify repair by test driving and rechecking for return of P1341 and associated symptoms.
Likely causes
- Broken wiring or pin pushed out at the cylinder 1 coil connector
- Failed coil/igniter that contains the ion sensing electrode
- High resistance connection or corrosion at connector/ground
- Spark plug with excessive wear, carbon fouling, or short
- Intermittent harness damage (abraded wire contacting chassis or other conductors)
Fault status
Status
MIL on; fault stored in ECM memory. Freeze frame may show engine RPM, load, and conditions when the ion circuit fault occurred. If intermittent, code may be logged as pending before becoming confirmed.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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