Check UL2 Circuit
electrical
Description
Front unloader UL2 coil circuit is shorted when energized or open at other times; the unit gives alarm only.
Activation Conditions
A problem has been detected in the front unloader (UL2) coil circuit. If this alarm is activated while the control system is calling for UL2 to be energized, the circuit is detected shorted. If this alarm occurs at any other time, the circuit is detected open.
Unit Behavior
Alarm only.
Reset Conditions
Auto reset when the circuit is normal, or Alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check for Additional Alarms: If this alarm is activated in conjunction with other alarms (00031 Failed to Start - Auto Mode, 00041 Engine Stalled, 05012 Check ENCU Power Circuit, 00078 Check SV1 Circuit, 00079 Check SV4 Circuit, 05013 Check Clutch Circuit or 00085 Check UL1 Circuit) check F5 and F10. Fuses must be good. Replace fuse(s) as required, clear alarms, restart and check for repeat alarm(s). 2. Check Coil a. Inspect coil and connector pins and terminals. Verify no damage to coil. Verify no damaged or corroded pins. b. Check resistance of coil. Refer to Section 1.11 for specifications. c. Use Component Test mode (Refer to Section 1.2.4) to test actual current draw of the circuit. Refer to Section 1.11 for specifications. Verify that the actual current is within specifications. 3. Check Power and Wiring a. Use Component Test mode (Refer to Section 1.2.4) to energize circuit. Check for power at UL2 terminal A and 3MM-8. Minimum 11 VDC. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion. b. Check for ground at UL2 terminal B (including SP-2) to GND1RING2. Good ground. If not, check connectors and wiring between terminals. Verify no damage, moisture or corrosion.