DTC Troubleshooting

DTC P2A00: A/F Sensor (Sensor 1) Circuit Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions:
- ECT SENSOR 1 above 158 °F (70 °C)
- A/T in D position (M/T in 3rd gear)
- Vehicle speed between 25 - 55 mph (40 - 88 km/h) for 5 minutes
- Drive at a steady speed between 55 - 75 mph (88 - 120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 4 seconds

5. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.

6. Turn the ignition switch OFF.
7. Replace the A/F sensor (Sensor 1).
8. Turn the ignition switch ON (II).
9. Reset the ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure.
11. Test-drive under these conditions:
- ECT SENSOR 1 above 158 °F (70 °C)
- A/T in D position (M/T in 3rd gear)
- Vehicle speed between 25 - 55 mph (40 - 88 km/h) for 5 minutes
- Drive at a steady speed between 55 - 75 mph (88 - 120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 4 seconds

12. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2A00 indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1.

NO - If Temporary DTC or DTC P2A00 is not indicated, or if any other Temporary DTCs or DTCs are indicated, go to step 13.

13. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If there was no Temporary DTCs or DTCs indicated on step 12, troubleshooting is complete. If any other Temporary DTCs or DTCs was indicated on step 12, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 10 and recheck.