ENCU Sensor Supply Voltage Low
electrical
Description
Sensor supply voltage is below 4.00 V, and the unit requires shutdown.
Activation Conditions
Voltage to sensor is below 4.00 V
Unit Behavior
Engine Operation: Required Shutdown. Electric Operation: This alarm will not activate in electric operation.
Reset Conditions
If trigger on message not received for five seconds, alarm reset or alarm may be manually reset by turning the unit off, then back on again.
Corrective Actions
1. Check Engine Speed Sensor (ENSSN) a. Check actual engine speed using a hand held tachometer and compare with speed shown in unit data. Must be ± 20 rpm. Must be a steady reading. b. Inspect sensor, connector pins and terminals. (See wiring schematic Section 8.) Verify there is no physical damage to sensor, and no damage or corrosion in connections. c. Check power from ENCU. Should read approximately +12 VDC from terminal ENCU-43 to ENSSN-3. d. Check power from ENCU. +5 VDC from terminal ENCU-29 to RPS-1 e. Check ground to ENCU. Check wiring from terminal ENCU-20 to ENSSN-1 f. Check signal to ENCU. Check wiring from terminal ENCU-2 to ENSSN-2 2. Check Rack Position Sensor (RPS) - Refer to Section 8.6.12.