DTC P2297: HO2S Performance During Decel Fuel Cut-Off (DFCO) Sensor 1: Troubleshooting

TROUBLESHOOTING CHART

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (OBD II) System Check. Was the check performed?	-	Go to Step 2	Go to On-Board Diagnostic (OBD II) System Check
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON. Any other component related Diagnostic Trouble Codes (DTCs) set?	-	Go to applicable DTC table	Go to Step 3
3	Using a scan tool, observe the Heated Oxygen Sensor 1 (HO2S1) voltage while decelerating the engine. The HO2S1 voltage should vary from specified voltage (100 - 900 mV) and while decelerating occasionally toggle below the specified voltage. Is the HO2S1 voltage toggle?	550 mV	Go to Step 4	Go to "DTC P0134 Oxygen Sensor No Activity"
4	Check the items in Diagnostic Aids and repair or replace component as needed. Refer to "Fuel System Diagnosis". Is the repair complete?	-	Go to Step 6	Go to Step 5
5	Turn the ignition OFF. Replace the Engine Control Module (ECM). Is the repair complete?	-	Go to Step 6	-
6	Using the scan tool, clear the Diagnostic Trouble Codes (DTCs). Start the engine and idle at normal operating temperature. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text. Does the scan tool indicate that this diagnostic has run and passed?	-	Go to Step 7	Go to Step 2
7	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK