Operation - Section 3 OM3012.3 Page 3-20 Instrument Panel and Controls (21) WARNING DECAL "Warning" faults (light ON) are ones that require attention in the near future, but in most conditions will not greatly affect performance. This decal warns the opera- tor that the transmission will upshift automatically in the event of engine overspeed. (see discussion for item 20, Figure 3-6) Apply brakes to slow down . "Severe" faults (light FLASHING) are ones that require immediate attention, because the engine could be significanly affected. Cummins "Quantum" Engine Electronic Control System Active fault conditions MUST be corrected as soon as possible.
The following information (items 22 through 26, Figure 3-6) relates to the Cummins "Quantum" Engine Elec- tronic Control System. (22) STOP ENG. Light If an abnormal engine condition develops, the control system will record a "fault" code associated with that condition. By use of a series of indicator lamps and switches, the system will display the numerical "fault" code. 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.
When the keyswitch is turned "On", the lamps (22, 24, 25) should illuminate for about 2 seconds and then turn "Off", if no "faults" are detected in the system. This is a system lamp test. (23) FAULT SCROLL Switch 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). 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". If a light stays ON, or FLASHES, then active "faults" have been detected by the system and the engine should not be started until the condition has been corrected. Refer to DETERMINING "FAULT" CODES. (24) 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. During engine operation, if a "fault" is detected in the system, a light associated with that condition will turn "ON" and stay on for "Warning faults", or it will turn "ON and FLASH" for more severe faults that can affect engine operation and require immediate attention. 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".