Cancelling out diagnostic code (a) After repair of the trouble area, the diagnostic code retained in memory by the ECU must be cancelled out by removing the STOP 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. NOTE: • 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. • If the diagnostic code is not cancelled out, it will be retained by the ECU and appear along with a new code in 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 is detected. (b) After cancellation, perform a road test, if necessary, confirm that a "normal" code is now read on the "CHECK ENGINE" warning light. If the same diagnostic code is still indicated, it indicates that the trouble area has not been repaired thoroughly. STOP 15A [Image shows a fuse] F06J19 DIAGNOSIS INDICATION (1) Including "Normal", the ECU is programmed with the following 16 diagnostic codes. (2) When 2 or more codes are indicated, the lowest number (code) will appear first. However, no other code will appear along with code No. 11. (3) All detected diagnostic codes, except 51 and 53, will be retained in memory by the ECU from the time of detection until cancelled out. (4) Once the malfunction is cleared, the "CHECK ENGINE" warning light on the instrument panel will go out but the diagnostic code(s) remain stored in ECU memory (except for code 51).