Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
NOTE:
- During the procedure, do not turn the vehicle to the ACCESSORY mode or the OFF (LOCK) mode.
- All readiness codes are cleared when the 12 volt battery is disconnected, if DTCs have been cleared, or if the PCM is reset with the HDS.
Enable Criteria
ECT SENSOR 1 at 158 deg.F (70 deg.C) or more.
Procedure
1. Enter the maintenance mode, then start the engine .
2. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. During the drive, decelerate (with the throttle fully closed) for 5 seconds. After about 3.5 miles (5.6 km), the readiness code should switch from incomplete to complete.Check the readiness codes screen for the AIR FUEL RATIO (A/F) SENSOR in the DTCs MENU with the HDS
- If the HDS indicates complete, readiness is complete.
- If the HDS indicates not complete, go to the next step.
4. Check for a Pending DTC. If there is no DTC, the enable criteria was probably not met. Select the DATA LIST Menu. Check ECT SENSOR 1 in the ALL DATA LIST with the HDS. If ECT SENSOR 1 is less than 158 deg.F (70 deg.C), run the engine until it is more than 158 deg.F (70 deg.C), then repeat the procedure.