Code
P1354
DAEWOO
P — Powertrain
#4 MISFIRE CIRCUIT - SHORT
Views:
UK: 5
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Short in ignition coil primary wiring (short to ground or B+)
- Faulty ignition coil or coil pack on cylinder #4
- Damaged or corroded connector or wiring to coil #4
- Defective ECM/ignition driver transistor
- Incorrect or weak spark plug on cylinder #4
- Related mechanical issue causing misfire (less likely) such as low compression or clogged injector (may trigger secondary checks)
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Rough idle or vibration
- Loss of power, hesitation or stumbling under acceleration
- Poor fuel economy and increased emissions
- Misfire stored for cylinder 4 (P0304 may also be present)
What to check
- Read stored codes and freeze-frame data; note if P0304 or other misfire codes present
- Visual inspection of coil pack, harness, and connectors at cylinder #4 for damaged insulation or corrosion
- Check for loose or damaged spark plug and connector at cylinder #4
- Measure supply voltage at the coil connector (key ON) — should be near battery voltage
- Check coil primary and secondary resistance against specification
- Swap coil #4 with another cylinder's coil to see if fault follows the coil
Signal parameters
- Coil supply voltage (pin) — approx. battery voltage with key ON (~12 V) (varies by vehicle)
- Coil primary resistance — typically low (example range 0.3–2 Ω) depending on coil design
- Coil secondary resistance — typically higher (example range 1 kΩ–15 kΩ) depending on coil type
- Primary driver pulse — short duration pulse when cranking/igniting (milliseconds, varies by load and rpm)
- No constant short to ground or B+ at coil primary circuit when key OFF
Diagnostic algorithm
- Verify the code with a scan tool and record freeze-frame and related codes (P0304, P0354, etc.).
- Perform a visual inspection of the coil, spark plug, and wiring at cylinder #4 for obvious damage, melted insulation, or corrosion.
- With key OFF, disconnect coil #4 connector and inspect pins; check for continuity to ground or battery to detect a short.
- Measure coil supply voltage at the connector with key ON. If no battery voltage, trace power feed and fuses.
- Measure coil primary and secondary resistance and compare to service specifications. Replace coil if out of spec.
- Swap coil #4 with another cylinder's coil. Clear codes and run engine. If the code moves to the other cylinder, the coil is faulty.
- If swapping coils does not move the fault, inspect wiring for a short to ground or B+ (backprobe harness, wiggle test while monitoring).
- Use an oscilloscope or DVOM to observe primary driver waveform during cranking/run. Look for missing pulses, stuck-on driver, or abnormal waveform that indicates driver or short.
- If wiring and coil assembly check good, suspect ECM driver fault. Verify connectors and grounds; replace ECM only after exhausting wiring and component checks.
- After repair, clear codes and road-test to confirm misfire and code do not return. Re-scan to confirm no related stored codes.
Likely causes
- Damaged/shorted wiring or connector at coil #4
- Failed ignition coil for cylinder #4
- Short inside coil pack assembly
- Faulty ECM ignition driver for cylinder #4
- Bad spark plug or poor plug-to-coil connection
Fault status
Status
Cylinder 4 misfire circuit short detected — possible shorted ignition circuit or faulty coil/driver. MIL set and misfire condition recorded for cylinder 4.
Repair difficulty: Medium
Diagnostic time: 1 - 3 hours
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