OM3226 Operation - Section 32 Operator Cab and Controls Page 32-21 CENTRY™ FUEL SYSTEM DIAGNOSTICS Lamp test/diagnostic test switch (8, Figure 32-12) may be used to activate the Centry™ fuel system diagnostic codes. When the Centry™ fuel system detects a fault and service engine indicator light (D6, Figure 32-12) illuminates, this switch will permit iden- tification of the fault(s) detected. GENERAL OPERATION Service engine indicator light (D6, Figure 32-12) monitors the Centry™ fuel system. Centry™ fault codes consist of three numerical digits. Each digit is indicated with up to five light flashes (service engine indicator light) per each digit.
There is a short pause between each digit of the fault code. Once all three digits are flashed, there is a longer pause, followed by a repeat of the same fault code sequence. When the key switch is turned on, this light will illumi- nate for about two seconds and then turn off, if no faults are detected in the system. If the light stays on or flashes, then active faults have been detected by the system. DO NOT start the engine if the indicator remains lit. 1. To determine an active Centry™ fault, turn the key switch to the OFF position. Ensure the engine completely stops, if it was on. 2.
Turn the key switch to the ON position (engine not on), and press the lamp test switch to the bottom ( position for one to two seconds, then release. The switch is spring-loaded and will return to the OFF position. NOTE: Since this is the lamp test switch, all red warning lights and amber indicator lights will light except those that are blank. The warning horn will also sound. DETERMINING FAULT CODES During engine operation, if a fault is detected in the system, the light will turn on and stay on indicating a warning fault. For more severe faults that can affect engine operation, the light will flash indicating that immediate attention is required..
Warning faults (light on) are ones that require atten- tion in the near future, but in most conditions, will not greatly affect governing performance. Severe faults (light flashing) are ones that require immediate attention, because Centry™ governor performance could be significantly affected, resulting in a backup mode of operation. Active fault conditions must be corrected as soon as possible.