Operation - Section 3 10/00 OM3023 Page 3-20 Operating Instructions ENGINE ELECTRONIC CONTROL SYS- TEM Engine Shutdown Light (Stop Engine) (7, Figure 3-2) The following items (7, 8, 9, 11, & 12, Figure 3 -2) relate to the engine electronic fuel control system. When illuminated, this red engine shutdown light indi- cates a serious engine prob- lem exists. 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.
When the keyswitch is turned "On", the lamps (7,8, 9) should illuminate for about 2 seconds and then turn "Off", if no "faults" are detected in the system. This is a system lamp test. The "fault" can be engine disabling. Stop the truck in a safe area, as soon as possible. Shutdown the engine and notify Maintenance personnel immediately. If a light remains ON, or if a light FLASHES, then active "faults" have been detected by the system and the engine should not be started until the condition has been corrected. Engine Maintenance Light (Check Engine) (8, Figure 3-2) This amber/yellow light, when illu- minated, indicates an engine "fault" exists.
Current engine operation may proceed, but the machine should be scheduled for checkout/repair as soon as practi- cal. Engine Maintenance Light (Protect Engine (9, Figure 3-2) Refer to DETERMINING "FAULT" CODES. 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 atten- tion. This blue engine maintenance light, when illuminated, indicates an "out-of-range" condition exists within the fuel temperature, cool- ant, 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 con- dition is allowed to get worse. Serious engine dam- age will occur if operation is continued without correcting the "fault". "Warning" faults (light ON) are ones that require attention in the near future, but in most conditions will not greatly affect performance. "Severe" faults (light FLASHING) are ones that require immediate attention, because the engine could be significantly affected. Active fault conditions MUST be corrected as soon as possible.