Code
P1355
DAEWOO
P — Powertrain
#5 MISFIRE CIRCUIT - SHORT
Views:
UK: 4
EN: 11
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or shorted ignition coil for cylinder 5
- Shorted or chafed wiring harness to coil #5 (short to ground or +12V)
- Faulty coil connector or corroded terminals
- Faulty ignition driver or PCM output for cylinder 5
- Poor ground or battery supply to the ignition circuit
- Aftermarket ignition components or incorrect replacement coil
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration, especially at idle
- Poor acceleration and reduced power
- Cylinder-specific misfire stored (misfire code for #5)
- Possible increased fuel consumption and failed emissions test
- Occasional hard starting or stalling
What to check
- Read freeze-frame and misfire counts with a scan tool; confirm code P1355 and related codes (P0305, etc.).
- Visually inspect coil, spark plug, and wiring for damage, corrosion or oil contamination.
- Check coil connector for corrosion, bent pins, or water ingress.
- Swap coil #5 with another cylinder's coil; see if the code follows the coil.
- Measure battery voltage at ignition circuit and coil connector with key on (12V supply present?).
- Measure primary and secondary coil resistance and compare to spec.
Signal parameters
- Battery voltage at coil connector: ~12.0–14.5 V (engine running)
- Primary coil resistance: typically low ohms (manufacturer spec; e.g. ~0.5–3 Ω) — check service data
- Secondary coil resistance: typically hundreds to thousands of ohms (check service data)
- Coil driver pulse width/dwell: varies by engine load (milliseconds) — monitor with scope
- Misfire count for cylinder 5: non-zero when fault present
- ECM command signal to coil: switching (pulsed) ground or + depending on system
Diagnostic algorithm
- Retrieve stored codes and freeze-frame data. Note any related codes (P0305, P0355, P0300).
- Perform a visual inspection of coil #5, spark plug, boot, and wiring. Look for oil, corrosion, melted insulation, or rodent damage.
- Clear codes. Start engine or road test to reproduce the code while monitoring misfire counters and coil driver outputs with a scan tool.
- Swap coil #5 with another cylinder's coil. If the misfire/short code moves to the other cylinder, replace the coil.
- Check for 12V supply and ground at the coil connector. With the key on, verify battery voltage on supply pin and proper switching on driver pin while cranking.
- Measure coil primary and secondary resistance and compare to specs. Replace coil if resistances are out of range or show short/open.
- Inspect and test continuity of the harness between coil connector and PCM. Check for short to ground or short to battery with an ohmmeter.
- Use a scope to verify primary waveform and look for abnormal spikes or lack of switching from the ECM.
- Repair any damaged wiring or connectors. Replace coil boots/plugs if fouled or damaged.
- If all wiring and coil checks are good and fault persists, suspect PCM/ignition driver — confirm with manufacturer procedures before replacing ECU.
- Safety note: take care when working near high-voltage ignition components; disconnect battery when performing wiring repairs.
Likely causes
- Failed coil-on-plug (open/short in primary or secondary winding)
- Pinched wire in harness causing short to chassis ground
- Corroded/loose connector at the coil or ECU
- Shorted coil harness to constant battery +12V (wiring repair or rodent damage)
- Faulty PCM/ignition driver (less common — verify wiring and coil first)
Fault status
Status
Cylinder 5 misfire circuit short detected — ECM reports an electrical short condition in the #5 ignition/coil circuit (short to ground or battery).
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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