Code
P1333
DAEWOO
P — Powertrain
#3 MISFIRE CIRCUIT - OPEN
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EN: 3
RU: 1
AI status
Completed
Completed
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Causes
- Open or high-resistance wiring/connectors in the ignition coil primary or secondary circuit for cylinder 3
- Faulty ignition coil (coil-on-plug or coil pack) at cylinder 3
- Damaged or fouled spark plug at cylinder 3
- Poor or missing power supply or ground to the coil
- Faulty cam/crank position signals (less common) affecting coil timing/diagnosis
- Faulty ECM/PCM or internal driver failure (least common)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Rough idle or vibration
- Misfire felt or reported specifically on cylinder 3
- Loss of power, hesitation or poor acceleration
- Increased fuel consumption and higher exhaust emissions
- Possible fuel trim or catalyst deterioration if prolonged
What to check
- Read freeze frame and live data to confirm cylinder 3 misfire counts and any related codes
- Perform visual inspection of coil, connector, wiring harness, and spark plug for cylinder 3
- Swap coil from cylinder 3 with another cylinder and see if the fault/code follows the coil
- Measure coil primary and secondary resistance and compare to spec
- Backprobe coil connector to check for 12V supply and ECM driver switching/ground signal when cranking
- Inspect related fuses and ignition power feeds
Signal parameters
- Ignition coil primary resistance (typical): ~0.2 - 3 ohms (vehicle-specific — consult service data)
- Ignition coil secondary resistance (typical): ~5k - 20k ohms (vehicle-specific)
- Supply voltage to coil: ~11 - 14.5 V with key ON/cranking
- ECM driver behavior: ground-switch pulse during crank/run when coil is commanded
- Misfire count / misfire balance: cylinder 3 should show elevated misfire when fault present
- Oscilloscope: primary ignition waveform should show switching pulses; open circuit shows no coil current/primary pulse
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data. Note whether only P1333 or additional codes (P0303, P0353, etc.) are present.
- Visually inspect cylinder 3 ignition coil, connector, spark plug, and nearby wiring for damage, corrosion, or oil/fouling.
- With ignition OFF disconnect coil connector and inspect terminals for corrosion, bent pins or water ingress. Reconnect firmly.
- Swap the coil from cylinder 3 with a known-good coil from another cylinder. Clear codes and run engine. If code moves to the other cylinder, replace the coil.
- Measure coil primary and secondary resistance and compare to factory specs. If out of range, replace coil.
- With connector reconnected, backprobe to verify 12V power feed and ECU driver (switched ground) while cranking. No supply or no switching indicates wiring/fuse/ECM problem.
- Check continuity from coil connector to the ECM pin. Repair any opens or high resistance.
- Inspect/replace spark plug for cylinder 3 if fouled or damaged and verify proper gap.
- If wiring, power and coil are good but problem persists, inspect cam/crank sensors for timing issues and recheck synchronization.
- If all circuits and components test good, consider ECM driver failure and perform ECM bench/diagnostic testing per manufacturer procedures before replacement.
Likely causes
- Loose, corroded, or disconnected coil connector on cylinder 3
- Failed ignition coil for cylinder 3
- Bad spark plug or plugged electrode in cylinder 3
- Open wire between coil and ECM (broken wire, damaged insulation, chafing)
- Blown fuse or missing 12V supply to ignition coils
Fault status
Status
P1333 — #3 MISFIRE CIRCUIT - OPEN: The ECM has detected an open or open-like condition in the ignition control/monitoring circuit for cylinder number 3, preventing normal ignition control or monitoring and resulting in a misfire condition.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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