Monitor DTC Status

Monitor DTC Status

CAUTION: If any DTCs related to injectors, HO2S, ECT (Engine Coolant Temperature)Sensor, Throttle Position sensor or Mass Air Flow Sensor are stored, do ALL REPAIRS associated with those codes before proceeding with this troubleshooting procedure.
If the misfire rate is high enough to cause possible catalyst damage (if the MIL was blinking), ensure that the monitoring for DTC P0420 is completed and passed after verifying the misfire repair.

1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions
4. Read "DTC Status" parameter




5. Is parameter displayed "History (Not Present) fault" ?

CAUTION:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.

YES
1) Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) If any misfire DTCs related to companion cylinders {P0301 (Cylinder1) & P0304 (Cylinder4), P0302 (Cylinder2)) & P0303 (Cylinder3)} are also stored, go to "Ignition System Inspection" procedure.
If not, go to next step as below