Inspection Procedure

DTC 27 Sub Heated Oxygen Sensor Circuit

INSPECTION PROCEDURE
1. Confirm DTC 27 is valid by following the driving pattern described below.

2. Are there any other codes (besides Code 27) being output?
- If Yes, Go to relevant diagnostic trouble code chart.
- If No, replace sub oxygen sensor.

DIAGNOSTIC TROUBLE CODE DETECTION DRIVING PATTERN
Malfunction: Open or Short in Sub Oxygen Sensor.
- Purpose of the driving pattern:
(a) To simulate diagnostic trouble code detecting condition after diagnostic trouble code is recorded.
(b) To check that the malfunction is corrected when the repair is completed confirming that diagnostic trouble code is no longer detected.




(1) Disconnect the EFI (15 A) fuse for 10 sec. or more, with ignition switch OFF. Initiate test mode (Connect terminals TE2 and E1 of data link connector 1 (DLC1) with ignition switch OFF).

(2) Start the engine and warm up, with all accessories switched OFF.

(3) After the engine is warmed up, let it drive at 50 ~ 55 mph (80 ~ 88 km/h) 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 (4), perform acceleration to 60 mph (96 km/h) with the throttle valve fully open.

HINT: If a malfunction exists, the Malfunction Indicator Lamp ("CHECK" engine lamp) will light up during step (5).

NOTICE; If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.