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.

DTC P0301-P0304

Step	Action	Values	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Start the engine. Allow the engine to idle or operate within the conditions listed in the Freeze Frame/Failure Records. Monitor all of the misfire counters with the scan tool. Are any of the misfire current counters incrementing?	-	Go to Step 3	Go to Intermittent Conditions
3	Are any DTCs other than DTC P0300 set?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	Go to Step 4
4	Can any abnormal engine noise be heard?	-	Go to Symptoms - Engine Mechanical	Go to Step 5
5	Turn OFF the ignition. Remove the fuel pump relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) . Remove the ignition coil for the affected cylinder, keeping the ignition connected to the harness connector. Refer to Ignition Coil(s) Replacement . IMPORTANT: Not grounding the ICM housing may cause an erratic spark. Connect a jumper wire between the top of the ignition coil and a good ground. Install the J 26792 Spark Tester on the ignition coil and a good ground. See Special Tools . Crank the engine. Does the spark tester spark?	-	Go to Step 7	Go to Step 6
6	Inspect the affected cylinder spark plug boot for a missing or damaged ignition coil spring. Did you find and correct the condition?	-	Go to Step 16	Go to Step 15
7	Remove the spark plug from the cylinder that indicated a misfire. Inspect the spark plug. Refer to Spark Plug Inspection . Does the spark plug appear to be OK?	-	Go to Step 8	Go to Step 9
8	Exchange the suspected spark plug with another cylinder that is operating properly. Refer to Spark Plug Replacement . Operate the vehicle under the same conditions that the misfire occurred. Did the misfire move with the spark plug?	-	Go to Step 14	Go to Step 12
9	Is the spark plug oil or coolant fouled?	-	Go to Symptoms - Engine Mechanical	Go to Step 10
10	Is the spark plug gas fouled?	-	Go to Step 12	Go to Step 11
11	Does the spark plug show any signs of being cracked, worn, or improperly gapped?	-	Go to Step 13	Go to Step 12
12	Perform the Fuel Injector Coil Test . Did you find and correct the condition?	-	Go to Step 16	Go to Symptoms - Engine Mechanical
13	Replace or gap the spark plug. Refer to Spark Plug Replacement . If an improper gap is found, be sure to gap the spark plugs using a wire type gage. Did you complete the action?	-	Go to Step 16	-
14	Replace the faulty spark plug. Refer to Spark Plug Replacement . Did you complete the replacement?	-	Go to Step 16	-
15	Replace the ignition coil housing. Refer to Ignition Coil(s) Replacement . Did you complete the replacement?	-	Go to Step 16	-
16	Was the customer concern the MIL flashing?	-	Go to Step 17	Go to Step 18
17	Operate the vehicle at the specified value for 4 minutes. Operate the vehicle within the Conditions for Running the DTC P0420 as specified in the supporting text. Refer to DTC P0420 . Does the DTC run and pass?	2,500 RPM	Go to Step 18	Go to DTC P0420
18	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 19
19	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK