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Home / DTC / P1352 — Ignition Coil A Primary Circuit Fault

P1352 — Ignition Coil A Primary Circuit Fault

Detailed page for trouble code P1352.

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Code

P1352

LINCOLN P — Powertrain

Ignition Coil A Primary Circuit Fault

Brand: LINCOLN
Type: P — Powertrain
Views: UK: 40 EN: 56 RU: 46
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Page language: EN

Causes

  • Open or short in ignition coil A primary wiring (power or low-side driver)
  • Corroded, loose or damaged coil connector or terminals
  • Failed ignition coil A (internal short/open)
  • Faulty PCM/ignition driver output
  • Blown fuse or faulty ignition relay supplying coil power
  • Poor battery/ground connections or low system voltage

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Rough idle or sustained misfire (often cylinder A / cylinder 1)
  • Hesitation, surging, or decreased acceleration
  • Reduced fuel economy
  • Difficulty starting or hard start
  • Possible intermittent starting or stalling

What to check

  • Retrieve freeze frame and misfire data with a scan tool; note ignition cycles and whether code is historic or active
  • Visually inspect coil A connector, wiring harness, and ground points for damage, corrosion, or oil intrusion
  • Check battery voltage and chassis/engine ground integrity
  • Verify fuses and ignition relay for circuit feeding coils
  • Backprobe coil connector: check key‑on battery power to coil primary and switching signal while cranking
  • Measure coil primary and secondary resistance per service manual

Signal parameters

  • Key ON (engine OFF): approx. battery voltage (~12 V) present at coil primary power terminal
  • Primary coil resistance (typical range, approximate): 0.3 to 2.0 ohms (varies by coil design) — consult vehicle spec
  • Secondary resistance (approx): 3k to 15k ohms (varies by coil) — consult vehicle spec
  • While cranking/running: low-side driver should switch primary to near ground; primary waveform shows pulses from ~12 V down to ~0–1 V when driven
  • Dwell/pulse width: depends on engine speed and PCM strategy (use oscilloscope or scan tool for correct pattern)
  • No-load primary current pulses typically under a few amps; sudden open or short to ground will alter waveform

Diagnostic algorithm

  1. Connect a professional scan tool and record freeze frame, readiness status, and misfire counts. Note whether P1352 is active and any related codes (P03xx, P035x).
  2. Perform a visual inspection of coil A connector and wiring harness for damage, corrosion, melting, or oil contamination. Repair any obvious issues.
  3. Check battery voltage (should be ~12.4 V+ static, 10 V+ while cranking). Verify good engine/chassis grounds and battery connections.
  4. With key ON (engine OFF) backprobe the coil power terminal — verify battery voltage is present. If no power, trace fuse/relay and repair supply circuit.
  5. Backprobe the low-side driver (trigger) terminal while cranking or running. Confirm the PCM switches the line to ground. If no switching, suspect driver or wiring open.
  6. Measure coil primary resistance and secondary resistance (specs in service manual). If out of spec, replace the coil.
  7. Swap coil A with another cylinder’s coil (only if coils are interchangeable and safe to swap). If the code or misfire moves with the coil, replace the coil assembly.
  8. If swapping coils does not move the fault, perform a wiring continuity test between the coil connector and the PCM pin for the driver and power circuits. Repair any open/short.
  9. Use an oscilloscope to inspect the coil primary waveform for missing pulses, clipped pulses, or abnormal voltage spikes that indicate driver or wiring issues.
  10. If wiring and coil check good but driver output is abnormal, test or replace the PCM only after verifying all grounds, supplies, and connectors, and after consulting technical service bulletins.
  11. Clear codes and test drive to confirm repair. Monitor for recurrence and note any intermittent symptoms for further wiring intermittent diagnosis.

Likely causes

  • Damaged wiring between PCM and coil A (chafed, pinched, or shorted)
  • Contaminated or corroded coil connector causing intermittent contact
  • Failed coil pack module for cylinder A
  • Bad PCM driver on the low-side switching circuit
  • Weak battery or poor ground affecting coil primary voltage

Fault status

⚠️ Status
P1352 - Ignition Coil A Primary Circuit Fault. PCM detected open/short or abnormal signal in coil A primary circuit; check coil, wiring, power/grounds, and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

P0351 P0352 P0301 P0300 P1351 P0353
166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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