Code
P1314
DAEWOO
P — Powertrain
IG. COIL 2 - LOW OUTPUT
Views:
UK: 1
EN: 1
RU: 1
AI status
Completed
Completed
100%
Causes
- Failed ignition coil (coil open, shorted or weak)
- Damaged or corroded coil connector or wiring harness (open, short to ground, high resistance)
- Poor or intermittent power supply to the coil (fused feed, relay, battery)
- Faulty ECM/ignition driver transistor
- Bad or fouled spark plug or spark plug wire (if applicable)
- Mechanical issues causing apparent low output (very low compression on cylinder 2)
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or engine misfire, especially under load
- Reduced power and acceleration
- Poor fuel economy and increased emissions
- Engine stumble, hesitation, or surging
- Difficulty starting or occasional backfiring
What to check
- Read and record all stored codes and freeze-frame data with a scan tool
- Check pending/misfire counters and cylinder 2 misfire rate
- Visual inspection of ignition coil 2, connector, wiring harness and ground points
- Inspect and remove coil to check for oil/moisture/physical damage
- Swap coil 2 with another cylinder’s coil (if coil-on-plug) to see if code/ misfire follows the coil
- Measure coil primary and secondary resistance with multimeter and compare to spec
Signal parameters
- Primary coil resistance (typical range): ~0.5–3.0 Ω (vehicle-specific)
- Secondary coil resistance (typical range): ~4 kΩ–20 kΩ (vehicle-specific)
- Supply voltage to coil: ~11–14.5 V when engine running
- Driver switching: pulsed ground or voltage from ECM; pulse width varies with RPM and load
- Expected primary waveform: sharp current ramp and collapse; measurable dwell time
- Secondary waveform: high-voltage spike (kV) sufficient to jump plug gap; amplitude varies with gap and condition
Diagnostic algorithm
- Connect scan tool, record codes, freeze frame and live misfire data for cylinder 2.
- Perform visual inspection of coil 2, connector and harness; repair any damaged wiring or connectors.
- Swap coil 2 with a known-good coil from another cylinder; clear codes and road test. If fault moves to the other cylinder, replace coil.
- If fault remains on cylinder 2, inspect/replace spark plug and leads (if used).
- Measure coil primary and secondary resistance and compare to spec. Replace coil if out of range.
- Use an oscilloscope to check primary and secondary waveforms for weak/absent discharge while cranking and at idle. Look for low amplitude, long rise time, or missing spikes.
- Verify constant 12 V supply to coil and good ground return; repair supply/ground circuits as needed.
- Perform compression test on cylinder 2 if coil, plug and wiring check normal to rule out mechanical causes.
- If wiring, coil, plug and compression are OK, investigate ECM ignition driver output and consult manufacturer service data for ECU tests or replacement procedures.
- Clear codes and re-check after repairs; confirm no recurrence under various engine loads.
Likely causes
- Damaged or degraded ignition coil for cylinder 2
- Corroded/loose connector or wiring to coil 2
- Faulty spark plug causing attempted weak discharge
- ECM/ignition driver failure (less common)
Fault status
Status
Ignition Coil 2 — Low output detected (possible weak/failed coil, wiring fault, or ECM driver issue).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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