Code
P1362
LINCOLN
P — Powertrain
Ignition Coil C Secondary Circuit Malfunction
Views:
UK: 20
EN: 39
RU: 26
AI status
Completed
Completed
100%
Causes
- Open, shorted or high-resistance secondary ignition circuit (coil-to-plug boot or spark plug)
- Damaged ignition coil (internal secondary winding or secondary connector)
- Poor or corroded connector/terminal at coil or coil-on-plug boot
- Worn, fouled or incorrectly gapped spark plug
- Faulty ignition coil mounting or grounding
- External arcing to engine ground or adjacent components
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle, single-cylinder misfire or engine hesitation
- Reduced power, poor acceleration
- Increased fuel consumption or failed emissions test
- Possible visible arcing or smell of ozone/insulation burn in engine bay
What to check
- Read freeze frame and live data with a scan tool; confirm cylinder identification for coil C
- Check for stored or pending misfire codes (e.g., P0303) and misfire counters on cylinder C
- Visual inspection of coil C, plug boot, and spark plug for damage, oil, carbon or cracks
- Inspect wiring and connector for damage, corrosion, or loose terminals
- Swap coil C with another coil (same type) and see if the code or misfire follows the coil (vehicle safe tests)
- Verify good battery/charging system voltage and engine ground integrity
Signal parameters
- Secondary resistance: typical range ~6 kΩ to 15 kΩ (varies by coil design; consult OEM spec)
- Primary resistance: typical ~0.4 Ω to 2.0 Ω (varies by design)
- High-voltage secondary pulse amplitude: can be several kV (5–40 kV) — not safe to measure directly without proper HV probe
- Secondary waveform: short-duration high-voltage pulse with expected rise/fall and consistent spark event per firing
- Dwell/coil charge time and primary waveform: PCM-driven pulses; verify consistent primary pulse width and timing in live data
Diagnostic algorithm
- Retrieve codes and freeze frame data; note engine conditions when the fault set (RPM, load, temperature).
- Clear codes and attempt to reproduce. Monitor misfire counts and live data for cylinder C.
- Perform visual inspection: coil C, boot, spark plug, and wiring harness. Repair obvious damage or corrosion.
- With ignition off, remove coil C and inspect spark plug for wear, fouling, or incorrect gap. Replace plug if suspect.
- Swap coil C with another identical coil (e.g., coil A or B). Clear codes and road/test. If the code/misfire follows the coil, replace the coil.
- Check connector terminals and pin fit; use contact cleaner and reseat. Repair broken wires or pins. Wiggle test harness while monitoring live data for intermittent faults.
- Measure primary and secondary coil resistances and compare to OEM specs. Replace coil if out of spec.
- Use an ignition secondary scope to inspect the coil C secondary waveform and compare to a known-good waveform or to other cylinders. Look for weak or missing spark, truncated waveform, or arcing signatures.
- Inspect engine grounds and PCM connector. If coil and wiring check good, suspect PCM ignition driver — consult manufacturer service information before replacing PCM.
- After repairs, clear codes, perform a full drive cycle and confirm code does not return and misfire counts are acceptable.
Likely causes
- Failed coil-on-plug (coil C) — most common on LINCOLN models
- Damaged or contaminated coil boot or spark plug for cylinder C
- Loose or corroded electrical connector at coil C
- Plug fouling (oil/carbon) causing poor secondary conduction
- Wiring harness abrasion between coil C and PCM
Fault status
Status
Ignition Coil C Secondary Circuit Malfunction (P1362) — Check coil/secondary ignition circuit for cylinder C.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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