Code
P1336
DAEWOO
P — Powertrain
#6 MISFIRE CIRCUIT - OPEN
Views:
UK: 3
EN: 11
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the #6 ignition coil primary/secondary circuit
- Poor, corroded, or disconnected coil connector or ECM pin
- Failed ignition coil or coil pack for cylinder 6
- Faulty ECM ignition driver output for cylinder 6
- Blown fuse or power supply fault to the coil/ignition module
- Damaged wiring harness (chafing, heat, rodent damage)
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or engine vibration, especially at idle
- Reduced engine power, hesitation and stumbles
- Poor fuel economy and increased emissions
- Possible hard start or intermittent misfire under load
- Diagnostic trouble code P1336 stored (manufacturer-specific)
What to check
- Read and record DTCs and freeze-frame data; note related codes (P0306, P0356, crank/cam sensor codes)
- Visual inspection of coil #6, connector, wiring harness and ECM connector for damage or corrosion
- Wiggle test connector/wiring while engine running to reproduce condition
- Check ignition fuse(s) and power feed to coil/coil pack
- Measure voltage at coil #6 connector (battery voltage with key ON) and check for pulsed driver to ground when cranking/running
- Measure coil primary resistance and secondary resistance (compare to spec or another cylinder)
Signal parameters
- Coil primary supply: ~battery voltage (~11–14.5 V) present at ignition-on at coil power pin
- Coil primary driver: pulsed ground or switched voltage matching engine speed during cranking/running
- Primary coil resistance: manufacturer-specific (typical values roughly 0.2–3 ohms primary, 2–20 kΩ secondary) — compare to service spec or another cylinder
- No continuity (open) expected only if circuit is open; short to ground/battery will alter behavior
- Crankshaft position sensor pulses should be present and stable for misfire detection to function
Diagnostic algorithm
- Retrieve all fault codes and freeze-frame information; note if P0306 or other misfire or ignition codes are present.
- Perform visual inspection: check coil #6, connector, wiring, and engine grounds for obvious damage, corrosion, or disconnection.
- Check fuses and any ignition power relays supplying the coil/ignition module; replace if blown.
- With ignition ON (engine off), verify battery power at the coil #6 power pin. Confirm good ground continuity to engine/chassis ground.
- Crank or run engine and measure coil #6 driver pin for pulsed signal to ground (use a scope or a 12V test lamp for basic check). If no pulse, suspect open circuit or driver failure.
- Measure coil primary resistance and compare to specification or a known-good cylinder. If primary is open (infinite), replace coil.
- Check continuity between the coil connector and the ECM driver pin; repair any open or high-resistance wiring found.
- Swap the coil (or coil pack) from cylinder 6 with another cylinder. If the code follows the coil, replace the coil. If it stays at cylinder 6, focus on wiring/ECM.
- If wiring continuity and connector are good and coil tests OK but no driver pulse, check ECM/PCM connector for bent pins and consider ECM driver fault — consult factory procedures before ECM replacement.
- After repairs, clear codes and perform a road/run test to confirm code does not return and misfire symptoms are resolved.
Likely causes
- Open or corroded connector at coil #6
- Broken wire between coil #6 connector and ECM
- Failed coil pack or internal coil primary open
- Blown ignition fuse or power feed open
- ECM driver failure (less common) or damaged PCB trace
Fault status
Status
ECM reports an open circuit in the #6 cylinder misfire/ignition detection circuit. Ignition coil signal or driver for cylinder 6 is not being detected. Inspect coil, connector, wiring, fuse/power feed, and ECM driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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