Code
P1313
DAEWOO
P — Powertrain
IG. COIL 2 - PF MAL
Views:
UK: 1
EN: 2
RU: 4
AI status
Completed
Completed
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Causes
- Open or shorted ignition coil (coil pack / coil-on-plug) for cylinder 2
- Damaged wiring or poor connection at coil 2 connector (open, short to ground or battery, corroded pins)
- Faulty ignition driver in the ECU/PCM
- Blown fuse or bad power supply/ground to the coil circuit
- Intermittent harness damage (pinch, rodent bite, heat)
- Incorrect installation after repair or swapped parts with different specifications
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration
- Engine misfire felt or recorded on cylinder 2 (may set P0302)
- Reduced power, hesitation or poor acceleration
- Poor fuel economy and increased emissions
- Possible hard start or repeated stalls under load
What to check
- Read freeze frame and other stored codes; note engine speed, load and temperature when the fault set
- Inspect coil 2 connector and wiring for corrosion, damage, or loose pins
- Check battery voltage and engine ground at time of fault
- Use a scan tool to monitor misfire counters and coil driver status for cylinder 2
- Measure coil primary and secondary resistance and compare to factory specs
- Swap coil 2 with another cylinder's coil and see if the code/fault follows the coil
Signal parameters
- Primary coil voltage waveform (should show switching to ground and battery feed during dwell)
- Dwell time / pulse width commanded by ECU
- Crankshaft position (CKP) sync signal and timing vs coil firing
- Battery voltage at coil supply during cranking and running
- Coil primary resistance (ohms) and secondary resistance (kΩ)
Diagnostic algorithm
- Retrieve codes and freeze-frame data with a scan tool; note any related misfire codes (e.g., P0302) or communication errors.
- Visually inspect coil 2, connector and harness for damage, corrosion, or oil contamination; repair as needed.
- Check fuse(s) and power feed to the ignition coils; verify good battery voltage at the coil power pin with ignition on.
- Measure coil 2 primary and secondary resistance and compare to specification. Replace coil if out of range.
- Swap coil 2 with a known-good coil from another cylinder. If code and symptoms move to the swapped cylinder, replace the coil.
- Backprobe coil connector while cranking/running to verify ECU driver switching and proper ground/power; use an oscilloscope if possible to inspect waveform for dropouts or short events.
- Inspect and test crankshaft position sensor and timing signals if driver waveform is correct but ignition timing is erratic.
- If wiring harness and coil test good, suspect ECU ignition driver fault—confirm with vehicle-specific diagnostic procedures before replacing the ECU.
- Clear codes and perform road test under similar conditions that set the fault to confirm repair.
Likely causes
- Faulty coil 2 (most common)
- Loose/corroded connector or damaged coil harness
- Failed ECU/ignition driver (less common)
- Low battery voltage or poor ground
- Related sensor input problem causing mis-triggering (crankshaft position sensor)
Fault status
Status
Ignition coil 2 primary/driver malfunction detected. Check coil 2, its wiring, power/ground, and ECU driver. May cause misfire on cylinder 2.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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