Check ENCU Power Circuit
electrical
Description
The ENCU-44 terminal circuit is shorted when energized or open at other times, and the unit alarms only.
Activation Conditions
A problem has been detected in the ENCU-44 terminal circuit. If this alarm is activated while the circuit is energized, the circuit is detected shorted. If this alarm is activated at any other time, the circuit is detected open.
Unit Behavior
Engine and Electric Operation: 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 Wiring a. Inspect the power module connector. Verify there is no damage to module, and no damage, moisture, or corrosion in connector. b. Use Component Test mode (Refer to Section 5.2.4) to energize the circuit. Must have minimum 11 VDC from the PM to the ENCU. c. Place the SROS in the OFF position and check continuity of the wiring from PM to the ENCU. Also check continuity from PM-32 to ground. Current draw of more than 5 amps will trip the FET. d. If no shorts in the wiring and no voltage from PM32, replace the PM and install current software. 2. Check ENCU - Replace ENCU with a known good component. Calibrate sensor and ENCU. Refer to Section 8.6.13