ELBOW-FLARED 6L9777 - Caterpillar

Table 1
AL Fault Code Troubleshooting    
AL Fault Code    Description    Troubleshooting    
AL1     High Water Temperature Alarm
Coolant temperature increases to within
6°C (11°F) of setpoint P015.     See the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".    
AL2     Low Engine Coolant Temperature Alarm
Coolant temperature decreases to setpoint P016.     See the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".    
AL3     Low Engine Oil Pressure Alarm
Oil pressure drops to within
34 kPa (5 psi) of the P013 or P014 setpoint.     See the Troubleshooting, "Troubleshooting Dedicated Shutdown Indicators".    
AL4     Fault Detected By Engine ECM
The engine ECM detects an alarm fault or a shutdown fault.     Refer to the appropriate engine troubleshooting service manual.    
AL5     Low Engine Coolant Level Fault
Coolant level drops below the probe of the coolant loss sensor.     Check level of engine coolant. The level of engine coolant must be above the probe of the sensor. Check for CID 111 faults. Perform the electrical connector inspection test. Refer to the Testing and Adjusting, "Electrical Connector - Inspect".    
AL6     High Engine Oil Temp Fault
Oil temperature increases to within
6°C (11°F) of setpoint P026.     Check level of engine coolant. The level of engine coolant must be above the probe of sensor. Check fan belt, etc. Check P026 setpoint.    
AL7     Generator Overvoltage Fault
Line to line voltages rises above the P102 or P105 setpoints.     Refer to the service manual for the voltage regulator that is being used. Check P101 through P106 setpoints.    
AL8     Generator Undervoltage Fault
Line to line voltage drops below the P108 or the P111 setpoints.     Refer to the service manual for the voltage regulator that is being used. Check P107 through P112 setpoints. Refer to the engine service manual for the cause of low engine speed. If engine speed is reduced and the engine control switch (ECS) is NOT in STOP, the GSC+ will issue this fault.    
AL9     Generator Overfrequency Fault
Frequency rises above the P114 or P117 setpoints.     See the Troubleshooting, "Indicator For Engine Overspeed". Check setpoints P113 through P118.    
AL10     Generator Underfrequency Fault
Frequency drops below the P120 or P123 setpoints.     Refer to the engine service manual for a cause of low engine speed. If engine speed is reduced and the ECS is NOT in STOP, the GSC+ will issue this fault. Check setpoints P119 through P124.    
AL11     Generator Reverse Power Fault
Reverse power rises above the P126 setpoint.     Refer to the engine service manual for a cause of lost engine power. Check setpoints P125 through P127.    
AL12     Generator Phase Overcurrent Fault
Phase current rises above the P129 or P134 setpoints.     Check for a cause of the overcurrent.
Check setpoint P029 and setpoints P128 through P135.    
AL13     Generator Total Overcurrent Fault
Total current rises above the P131 or P136 setpoints.     Check for a cause of the overcurrent. Check setpoint P029 and setpoints P128 through P137.    
AL14     Phase A No Voltage Input Fault
Phase A voltage not