Code 21
CODE No. 21Purpose of the driving pattern.
(a) To simulate diagnostic code detecting condition after diagnostic code is recorded.
(b) To check that the malfunction is corrected when the repair is completed, confirming that diagnostic code is no longer detected.
Code No. 21:
1. Disconnect the EFI fuse (15 A) for 60 seconds or more, with ignition switch OFF.
2. Start the engine and warm the engine up with all accessory switches OFF.
3. After the engine is warmed up, let it idle for 3 minutes.
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 automatic, or in case of manual transmission, upshift appropriately. 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 to 2 minutes after staring acceleration.
6. After driving, stop at a safe place and turn the ignition switch OFF for 3 seconds or more.
7. Start the engine and perform steps (3), (4), and (5).
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 cannot detect the malfunction.