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 P0221

Step	Action	Values	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls 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	Is DTC P0121 also set?	-	Go to Step 6	Go to Step 3
3	Turn OFF the ignition. Turn ON the ignition, with the engine OFF. Observe the throttle position (TP) sensor 2 voltage with a scan tool. Slowly depress the accelerator pedal to wide-open throttle (WOT) and then slowly return the pedal to closed throttle. Does the TP sensor 2 voltage decrease as the pedal is depressed and increase as the pedal is released?	-	Go to Intermittent Conditions	Go to Step 4
4	Turn OFF the ignition. Disconnect the throttle body harness connector. Refer to Throttle Body Assembly Replacement . Turn ON the ignition, with the engine OFF. Observe the TP sensor 1 voltage with a scan tool. Is the TP sensor 1 voltage near the specified value?	0 V	Go to Step 5	Go to Step 11
5	Turn OFF the ignition. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the TP sensor 2 and the signal circuit of the TP sensor 2. Turn ON the ignition, with the engine OFF. Observe the TP sensor 2 voltage. Is the TP sensor 2 within the specified range?	4.8-5.2 V	Go to Step 10	Go to Step 6
6	Measure the voltage from the 5-volt reference of the TP sensor to a good ground with the DMM. Is the voltage near the specified value?	5 V	Go to Step 7	Go to Step 13
7	Probe the 5-volt reference circuit of the TP sensor with a test lamp connected to a good ground. Does the test lamp illuminate?	-	Go to Step 8	Go to Step 13
8	Turn OFF the ignition. IMPORTANT: It may be necessary to remove the ECM/TCM fuse to allow the ECM to power down. Allow the engine control module (ECM) to completely power down. This can be verified by the loss of communication on the scan tool. Measure the resistance from the low reference circuit of the TP sensor to a good ground with the DMM. Is the resistance less than the specified value?	5ohm	Go to Step 9	Go to Step 17
9	Idle the engine. Observe the mass air flow (MAF) sensor g/s with a scan tool. Increase the engine speed slowly to 3,000 RPM and then back to idle. Does the MAF sensor g/s change smoothly and gradually through the specified range of the test?	7-40 g/s	Go to Step 12	Go to DTC P0101
10	Test the signal circuit of the TP sensor 1 for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
11	Test the signal circuit of the TP sensor 1 for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
12	Test the signal circuit of the TP sensor 1 for the following conditions: A short to ground A short to the low reference circuit High resistance An open circuit Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 15
13	Test the 5-volt reference circuit of the TP sensor for the following conditions: A short to ground High resistance An open circuit Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 14
14	Test the 5-volt reference circuit of the TP sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
15	Test for an intermittent and for a poor connection at the TP sensor. 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 20	Go to Step 16
16	Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement . Did you complete the replacement?	-	Go to Step 20	-
17	Repair the open or high resistance in the low reference circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	-	Go to Step 20	-
18	Test for an intermittent and for a poor connection at 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 20	Go to Step 19
19	Replace the ECM. Refer to Engine Control Module (ECM) Replacement . Did you complete the replacement?	-	Go to Step 20	-
20	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 21
21	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