Conditions for Clearing the MIL/DTC

WARNING: This page is about a different variant/trim than selected.

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 P0030, P0036, P0050, or P0056

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Clear the DTCs with a scan tool. Start the engine. Observe the DTC info parameter with a scan tool for at least 30 seconds. Does the DTC fail this ignition?	-	Go to Step 4	Go to Step 3
3	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition. 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 4	Go to Intermittent Conditions
4	IMPORTANT: Use a known good ground. Do not use the heated oxygen sensor (HO2S) heater low control circuit or HO2S low signal circuit. Turn OFF the ignition. Disconnect the affected HO2S. Refer to Engine Controls Component Views . Turn ON the ignition, with the engine OFF. Probe the HO2S heater ignition 1 voltage circuit, at the engine harness side of the HO2S connector with a test lamp that is connected to a good ground. Does the test lamp illuminate?	-	Go to Step 5	Go to Step 6
5	Turn OFF the ignition. IMPORTANT: The test lamp may flash OFF-ON as the engine control module (ECM) commands the sensor heating operation. Connect a test lamp between the HO2S ignition 1 voltage circuit and the HO2S heater low control circuit. Start the engine. Does the test lamp illuminate?	-	Go to Step 9	Go to Step 7
6	Test the appropriate HO2S heater ignition 1 voltage circuit fuse for an open. Refer to Circuit Testing in Wiring Systems. Is the fuse open?	-	Go to Step 8	Go to Step 13
7	Test the affected HO2S heater low control circuit for an open or high resistance. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 12
8	Test the appropriate HO2S heater ignition voltage 1 circuits for a short to ground and replace the fuse. Refer to Circuit Testing , Wiring Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 10
9	Turn OFF the ignition. Allow the engine to cool for at least 5 minutes. Measure the resistance from the heater low control circuit of the HO2S to the ignition 1 voltage circuit of the HO2S at the sensor side. Is the resistance within the specified range?	2-20ohm	Go to Step 12	Go to Step 11
10	Disconnect the HO2S that shares the affected HO2S heater ignition 1 voltage circuit. At the sensor side of each, HO2S connector, test the HO2S heater ignition 1 voltage circuits for continuity with the following circuits: The HO2S high signal circuit The HO2S low signal circuit The ground circuit Does any continuity exist?	-	Go to Step 14	Go to Intermittent Conditions
11	Test for an intermittent and for a poor connection at the harness connector of the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs , and Heated Oxygen Sensor (HO2S) Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 14
12	Test for an intermittent and for a poor connection at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	Go to Step 15
13	Repair the open or high resistance in the affected HO2S heater ignition 1 voltage circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 16	-
14	Replace the affected HO2S. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1 , Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 , Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 1 , or Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 . Did you complete the replacement?	-	Go to Step 16	-
15	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 16	-
16	Clear the DTCs with a scan tool. Turn OFF the ignition. 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 17
17	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK