Operation - Section 3 OM3005.3 7/96 Page 3-24 Instrument Panel and Controls (55) FAULT CHECK Switch 2. Turn keyswitch to "ON" position (engine NOT running) and hold the Fault Check switch (55) in the "ON" position. This Fault Check switch, when moved to the "ON" (up) position, may be used to activate the "Quantum" Sys- tem diagnostic codes. When the system detects a "fault" and one of the indicator lamps (56, 57, 58) illuminates as previously described, this switch will permit determination of the kind of "fault(s)" detected. (56) CHECK ENGINE Light This amber/yellow light, when illuminated, indicates an engine "fault" exists.
Current engine operation may proceed, but the machine should be scheduled for checkout/repair as soon as practical. 3. If there is an active fault: a. The amber/yellow Check Engine light (56v) will flash once. b. There will be a 1 -- 2 second pause, and then the red STOP ENGINE light (58) will flash out the three digit diagnostic code. Each digit is indicated with up to five light flashes for each digit. There is a short pause between each digit of the fault code. 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. (57) PROT. ENG.
Light This white Engine Protection light, when illuminated, indicates an "out-of-range" condition exists within the fuel temperature, coolant, oil, or intake air system(s) of the engine. The light may show initially as a constant "On", but will go to "flashing On", if the condition is allowed to get worse. Serious engine damage will occur if operation is continued without correcting the "fault". (58) STOP ENG. Light This red Stop Engine light, when illuminated, indicates a serious engine problem exists. The "fault" can be engine disabling. Stop the truck in a safe area, as soon as possible. Shutdown the engine and notify Mainte- nance immediately. (59) FAULT SCROLL Switch 4.
The system will continue to flash the same fault code until the FAULT SCROLL Switch (59) is activated again. This FAULT SCROLL switch, may be used to scroll through the recorded faults held in memory. It will display only active fault codes. 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). EXITING THE DIAGNOSTICS MODE Starting the engine, or turning the keyswitch to the OFF position, will EXIT the diagnostics fault flash mode. Activating the switch again will advance to the next fault code, etc.
Once all active fault codes have been dis- played, the fault code display sequence will be re- peated, starting from the first fault code. Moving the switch lever to the "down" position momen- tarily and releasing, permits the system to scoll (as described above) backwards through the fault "list". DETERMINING "FAULT" CODES If active fault codes have been determined as de- scribed previously, refer to the Cummins Engine Quan- tum System "Troubleshooting and Repair Manual", Bulletin No. 3666113,Cummins’ "INSITE" service tool for Quantum, or contact an Authorized Repair Loca- tion. 1.
To determine an active "Quantum fault", turn the keyswitch to the "OFF" position and wait until the engine completely stops.