P0306 Cylinder 6 Misfire

P0306 Cylinder 6 MisfireWhen monitored, with the engine running, the adaptive numerator has been succesfully updated. Set conditions, the variation in crankshaft speed between each cylinder exceeds a calibrated value, based on engine rpm load. Default actions, the MIL light illuminate.

P0306 Cylinder 6 Misfire

Possible causes:
  • ASD relay output.
  • Injector control circuit.
  • Coil control circuit.
  • Ignition wire.
  • Spark plug.
  • Ignition coil.
  • Fuel delivery system issue.
  • Fuel injector.
  • Engine mechanical.
  • Powertrain Control Module (PCM).

Diagnose code P0306 Cylinder 6 Misfire

(Sorry!!! Step 1-2, refer to code P0301)
Step 1. Check active DTC
Step 2. Visual Inspection

(Sorry!!! Step 3-5, refer to code P0302)
Step 3. Ignition system operation
Step 4. Spark plug
Step 5. Fuel pressure check

(Sorry!!! Step 6-8, refer to code P0303)
Step 6. Fuel pressure leak down
Step 7. Fuel injector operation
Step 8. Engine mechanical

(Sorry!!! Step 9-11, refer to code P0304)
Step 9. Fuel injector control
Step 10. Injector control circuit
Step 11. Fuel supply line restricted

(Sorry!!! Step 12-14, refer to code P0305)
Step 12. Fuel pump inlet strainer
Step 13. ASD relay output circuit
Step 14. Ignition coil

Step 15. Coil control 6 circuit shorted to ground
Turn the ignition off, disconnect the PCM harness connector. Measure the resistance between ground and the coil control 6 circuit in the coil on plug harness connector.

Is the resistance below 100 Ohms?

Yes, repair the short to ground in the coil control 6 circuit.
No, go to step 17.

Step 16. Coil control 6 circuit open
Turn the ignition off, disconnect the PCM harness conenctor. Measure the resistance of the coil control 6 circuit from the coil on plug harness connector to the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 17.
No, repair the open in the coil control 6 circuit.

Step 17. Powertrain Control Module (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ignition coil and Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the ignition coil and PCM connector. refer any Service Bulletins that may apply.

Were there any problems found?

Yes, repair as necessary.
No, replace and program the Powertrain Control Module (PCM). Perform the Powertrain Verification Test.

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