Code 27

DTC 27 - Sub-Oxygen Sensor Circuit

Purpose of the driving pattern:
* To simulate diagnosis code detecting condition after diagnosis code is recorded.
* To check that the malfunction is corrected when the repair is completed confirming that the diagnosis code is no longer detected.

DTC 27 - Sub-Oxygen Sensor Circuit:

1. Disconnect the fuse EFI (15 A) for 10 seconds or more, with IG switch OFF.
2. Start the engine and warm the engine up with all ACC switches OFF.
3. After the engine is warmed up, let it drive at 50 - 55 mph for 10 minutes or more.
4. After driving, stop at a safe place and perform idling for 2 minutes or less.
5. After performing the idling in step 4, perform acceleration to 60 mph with the throttle fully open and drive at 60 mph for 1 minute.
6. After driving, stop at a safe place and turn the IG switch OFF for 3 seconds or more.
7. Start the engine and perform steps 3, 4, and 5 again.

HINT: If a malfunction is detected, the "CHECK" engine warning light will light up during step 7.

NOTICE: If this procedure is not strictly followed, you can not detect the malfunctions.