(1) Disconnect the fuse EFI (15 A) for 10 sec. or more, with IG switch OFF.
(2) Start the engine and warm the engine up with all ACC switch OFF.
(3) After the engine is warmed up, let it idle for 3 min.
(4) Accelerate gradually and maintain at approximately 1,500 rpm, or within the 1,300 to 1,700
rpm range. Turn the A/C on, and drive in ”D” for A/T, or in case of M/T, upshift appropri–
ately shift carefully so that the engine speed would not fall below 1,200 rpm. depress the
accelerator pedal gradually and maintain a steady speed to avoid engine braking.
(5) Maintain the vehicle speed at 40 – 50 mph.
Keep the vehicle running for 1 – 2 min. after starting acceleration.
(6) After driving, stop at a safe place and turn the IG switch OFF for 3 sec. or more.
(7) Start the engine and perform steps (3), (4) and (5) again.
HINT: If a malfunction is detected, the Malfunction Indicator Lamp will light up during step (7).
NOTICE: If this procedure is not strictly followed, you can not detect the malfunctions.
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.
Main Oxygen Sensor Circuit
Malfunction: Main Oxygen Sensor Deterioration
DTC
P02539
–ENGINE MFI SYSTEM
EG1–116
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