CANCELLING OUT DIAGNOSTIC CODE 1. After repairing of the trouble, the diagnostic code retained in memory by the ECU must be cancelled out by removing the EFI fuse 15A for 30 seconds or more, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out) with the ignition switch off. HINT: • Cancellation can also be done by removing the battery negative (—) terminal, but in this case other memory systems (radio ETR, clock etc.) will also be cancelled out. • Even if the diagnostic code is not cleared out, it will be retained by the ECU and appear along with a new code in the event of future trouble. • If it is necessary to work on engine components requiring removal of the battery terminal, a check must first be made to see if a diagnostic code has been recorded. 2. After cancellation, road test the vehicle to confirm that the "normal" code is now displayed by the "CHECK ENGINE" warning light. If the same diagnostic code is still indicated, it means that the trouble area has not been repaired thoroughly. [THIS IS FIGURE: Diagram showing EFI 15A fuse location, labeled as F03836] DIAGNOSIS INDICATION 1. When 2 or more codes are indicated, the lowest number (code) will appear first. 2. All detected diagnostic codes, except code Nos.51 and 53, will be retained in memory by the ECU from the time of detection until cancellation. 3. Once the malfunction is cleared, the "CHECK ENGINE" warning light on the instrument panel will go out but the diagnostic code(s) remains stored in ECU memory (except for code Nos.51 and 53).