CIRCUIT DESCRIPTION (Cont'd) DIAGNOSTIC TROUBLE CODE DETECTION DRIVING PATTERN 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. Malfunction: Open or Short in Main Heated Oxygen Sensor (rpm) 4,000 rpm 2,000 rpm Idling IG SW OFF ① ② ③ ④ ⑤ Detection 3 min. 90 sec. (Time) FI8465 HINT: Before this test, check the feedback voltage for oxygen sensor. (1) Disconnect the EFI No.1 fuse (30A) for 10 sec. or more, with IG switch OFF. Initiate test mode (Connect terminal TE2 and E1 of data link connector 2 with IG switch OFF). (2) Start the engine and warm up. (3) Idle the engine for 3 min. (4) Race the engine quickly to 4,000 rpm 3 times using the accelerator pedal. (5) Race the engine at 2,000 rpm for 90 sec. HINT: If a malfunction exists, the malfunction indicator lamp will light up during step (4). NOTICE: If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.