P0306

DTC P0306

DTC DESCRIPTORS

DTC P0300
Engine Misfire Detected

DTC P0301
Cylinder 1 Misfire Detected

DTC P0302
Cylinder 2 Misfire Detected

DTC P0303
Cylinder 3 Misfire Detected

DTC P0304
Cylinder 4 Misfire Detected

DTC P0305
Cylinder 5 Misfire Detected

DTC P0306
Cylinder 6 Misfire Detected

DTC P0307
Cylinder 7 Misfire Detected

DTC P0308
Cylinder 8 Misfire Detected

CIRCUIT/SYSTEM DESCRIPTION
The engine control module (ECM) monitors changes in crankshaft speed using input from the crankshaft position sensor. The ECM adjusts the fuel delivery to each cylinder in order to minimize crankshaft speed changes. If the ECM identifies a cylinder or cylinders requiring an excessive amount of fuel in order to maintain the correct crankshaft speed, a DTC will set.

CONDITIONS FOR RUNNING THE DTC

P0300
- The engine is running at idle for more than 10 seconds.
- The engine coolant temperature (ECT) is more than 40°C (104°F).
- DTC P0300 runs once per ignition cycle when the above conditions are met.
- DTCs P0301-P0308 must run before DTC P0300 runs.

P0301-P0308
- DTCs P0117, P0118, P0335, P0336, P0500, P1223, P1226, P1229, P1232, P1235, P1238, P1241, P1244, P2146, P2149, P2152, P2155 and P062C are not set.
- The ECT is more than 40°C (104°F).
- The engine is running at idle for more than 10 seconds.
- The engine RPM is between 500-1,500 RPM.
- The vehicle speed is less than 3 mph.
- The calculated fuel rate is between 3 cu.mm and 25 cu.mm.
- DTCs P0301-P0308 will run once per ignition cycle in a total of 440 engine revolutions when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
Cylinder RPM is less than the minimum average cylinder speed after an injection event counted 180 times.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
If there are any other DTCs set, diagnose those DTCs first.

CIRCUIT/SYSTEM TESTING
If no other DTCs are set, perform the Fuel Injector Balance Test with Tech 2 (Manual Transmission) Fuel Injector Balance Test with Tech 2 (Automatic Transmission).