Check ECU Power Circuit
electrical
Description
The ENCU-44 terminal circuit has a problem and is shorted or open, and the unit only alarms.
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 Power Module (PM) and ECU connectors. 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 at PM-32. If no voltage at PM-32, check Diesel Electric Relay (DER). Refer to Section 5.5. c. With circuit still in Component Test mode check voltage at ENCU-71. Must have minimum 11 VDC at ENCU-71. If no voltage at ENCU-71, check connectors and wiring between terminals for damage, moisture or corrosion. d. Place the SROS in the OFF position and check continuity of the wiring from ENCU-01 and ENCU-02 to the battery negative cable connection. Check connectors and wiring between terminals for damage, moisture or corrosion. 2. Check ECU - Replace ECU with a known good component. Calibrate sensor and ECU. Refer to Section 8.5.11