OM3023 10/00 Operation - Section 3 Operating Instructions Page 3-21 This Fault Check switch, when moved to the "ON" (down) position, may be used to activate the engine electronic control system diagnostic codes. When the system detects a "fault" and one of the indicator lamps (7, 8, 9) illuminates as previously described, this switch will permit determination of the kind of "fault(s)* detected. Fault Check Switch (11, Figure 3-2) c. After all three digits are flashed, the yellow lamp will flash once, and then the red lamp will repeat the same fault code sequence as before.
Fault Scroll Switch (12, Figure 3-2) This Fault Scroll switch may be used to scroll through the recorded faults held in memory. It will display only active fault codes. 4. The system will continue to flash the same fault code until the Fault Scroll Switch (12) is acti- vated again. To display the next active fault code, move the switch lever to the "up" position momentarily and release (switch is spring-loaded to the center "OFF" position). Activating the switch again will advance to the next fault code, etc. Once all active fault codes have been displayed, the fault code display sequence will be repeated, starting from the first fault code.
EXITING THE DIAGNOSTICS MODE Starting the engine, or turning the key- switch to the OFF position, will EXIT the diagnostics fault flash mode. Moving the switch lever to the "down" position momentarily and releasing, permits the system to scroll (as described above) backwards through the fault "list". Determining "Fault" Codes 1. To determine an active "fault", turn the keyswitch to the "OFF" position and wait until the engine completely stops. If active fault codes have been determined as described previously, refer to the appropriate Komatsu engine manual. 2. Turn keyswitch to "ON" position (engine NOT running) and hold the Fault Check switch (11) in the "ON" position. 3.
If there is an active fault: a. The amber/yellow Engine Maintenance light (8) will flash once. b. There will be a 1-2 second pause, and then the red Engine Shutdown light (7) will flash out the three digit diagnostic code. Each digit is indicated with up to nine light flashes for each digit. There is a short pause between each digit of the fault code.