Code
P1319
DAEWOO
P — Powertrain
IG. COIL 3 - OVER OUTPUT
Views:
UK: 2
EN: 3
RU: 9
AI status
Completed
Completed
100%
Causes
- Failed or internally shorted ignition coil (cylinder 3)
- Short to battery or other high-voltage source on the coil primary or control circuit
- Damaged wiring harness or connector (chafing, corrosion, pin damage)
- Poor or missing ground at coil or ECM ground
- Faulty ECM or ignition driver transistor
- Aftermarket or incorrect replacement coil with wrong specifications
Symptoms
- Check Engine Light with DTC P1319 set
- Misfire felt on cylinder 3 or rough idle
- Poor acceleration, reduced power
- Increased fuel consumption
- Intermittent or continuous engine stalling
- Possible backfire or ignition noise from affected cylinder
What to check
- Read freeze frame and live data for misfire counts and related codes (P0303 etc.)
- Visual inspection of coil 3, connector and wiring for damage, corrosion, heat or melting
- Check and secure engine/coil grounds and battery connections
- Measure coil primary and secondary resistance and compare to specification
- Back-probe coil driver lead to check for short to battery or abnormal voltage with ignition off and on
- Use an oscilloscope to view coil primary driver waveform (dwell, peak voltage spikes)
Signal parameters
- Battery supply: ~12–14.5 V during cranking/run (verify under load)
- Coil primary resistance: typically low (ohms range) — compare to OEM spec
- Coil secondary resistance: typically kilohms — compare to OEM spec
- Coil driver duty/dwell: milliseconds (varies by engine and ECU)
- Primary current: up to a few amps during dwell (varies by design)
- Driver output waveform: clean square or pulsed waveform without excessive peaks or clipped signals (use scope)
Diagnostic algorithm
- Retrieve trouble code, freeze-frame data and check for related codes (P0303 or P0353).
- Visually inspect coil 3, connector and wiring for obvious damage, corrosion, melted insulation or oil/water contamination.
- Clear codes and perform a test run to confirm repeatable fault (note conditions when code sets).
- Measure coil 3 primary and secondary resistance and compare to OEM values. Replace coil if out of spec or shorted.
- With ignition off, check control/primary wire for short to B+ or other power using an ohmmeter between the coil control pin and battery positive.
- Back-probe the coil driver with ignition on (engine cranking/run) and observe voltage waveform with an oscilloscope; look for abnormal high amplitude, no switching, or stuck-on conditions.
- Swap coil 3 with a known-good coil from another cylinder. If code follows the coil, replace the coil. If code stays on cylinder 3, suspect wiring or ECU.
- Inspect and test associated ground points and supply circuits for proper continuity and voltage under load.
- If coil and wiring check OK, consult dealer-level diagnostic procedures for testing/replacing the ECM or ignition module; consider professional bench testing.
- After repair, clear codes and perform road/test cycles to verify the fault does not return.
Likely causes
- Internal short in coil 3 (most common)
- Shorted control/primary lead to battery or constant power
- Damaged connector or pin causing abnormal current
- ECM/ignition driver failure if coil and wiring check good
Fault status
Status
ECM detected over-output condition on ignition coil driver for cylinder 3 — excessive voltage/current or abnormal driver behavior.
Repair difficulty: Medium
Diagnostic time: 1-2 hours
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