Actuator Abnormal ENCU
electrical
Description
Actuator current is above 3.0A or below 80mA, and the unit requires shutdown during engine operation; it will not activate in electric operation.
Activation Conditions
Actuator current >3.0A or < 80mA
Unit Behavior
Engine Operation: Required Shutdown. Electric Operation: 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. Refer to 05012 Check ENCU Power Circuit 2. Check Engine Control Unit (ENCU) and Fuel Speed Actuator (FSA) a. Check voltage from fuse F3 through PCM-34 and SP-6 to ENCU-22. Verify correct fuse, see Figure 1.7. Must have minimum 11 VDC with the battery connected and SROS in the OFF position. b. Check voltage from 3MM-9 to ENCU-44. Must have minimum 11 VDC with SROS in the START/ RUN position. If no, energize the run relay output using component test mode (refer to Section 1.2.4) and retest. c. Check for ground at ENCU-19 and ENCUGND-A (at the battery negative cable connection). If ground not good, check connectors and wiring between terminals for damage, moisture or corrosion. d. Inspect fuel/speed actuator (FSA), engine speed sensor (ENSSN) and engine speed control unit (ENCU) connector pins and terminals. Verify no physical damage to components, and no damage or corrosion in connectors. e. Check resistance and amp draw of FSA. Refer to Section 1.11 for specifications. f. Check FSA plunger. Must move in and out freely. Refer to engine manual.