Check Engine RPM
engine
Description
Engine RPM was below 1300 rpm, above 1950 rpm for five minutes, or dropped below 1290 rpm after running above 1300 rpm, and the unit alarms or shuts down.
Activation Conditions
In Engine Operation and 00130 Check Engine RPM Sensor is not active and engine speed is less than 1300 rpm, or greater than 1950 rpm for five minutes, or engine rpm to less than 1290 rpm for five seconds after the engine speed has been greater than 1300 rpm for 3 seconds.
Unit Behavior
Engine Operation: Alarm only or (if configured for shutdown) engine and unit shutdown and alarm. Electric Operation: This alarm will not activate in Electric Operation.
Reset Conditions
Auto reset if engine speed is within the specified range for five minutes or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Run Pretrip - Pretrip will test low speed and high speed operation. 2. force Low Speed Operation - Set the High Speed Delay Functional Parameter to 10 minutes and restart unit. (Reset following testing.) System should run in low speed. (If not, check speed overrides, Section 4.10.3.) Ensure System is calling for low speed when performing step 3. 3. Check Low Speed Engine RPM a. Check actual engine speed using hand held tachometer. Refer to Table 2–1. Speed must be within range provided above. b. Compare actual speed with that shown in Unit Data. Readings within ± 50 rpm. 4. Check High Speed Engine RPM a. Check actual engine speed using hand held tachometer. Refer to Table 2–1. b. Compare actual speed with that shown in Unit Data. Both readings must be within ± 50 rpm. 5. Check Engine Air-Intake System a. Check air cleaner indicator. Flag must not be visible. b. Inspect air intake system. Verify hoses and tubes in good condition, with no kinks or restrictions. 6. Check Engine Control Unit (ENCU) and Fuel/Speed Actuator (FSA) a. Check voltage from fuse F4 through PM-15 and SP-24 to ENCU-22. Verify correct fuse, see Figure 2.5. Must have minimum 11 VDC with the battery connected and SROS in the OFF position. b. Check voltage from PM-32 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 5.2.4) and retest. c. Check for ground at ENCU-19 and PM-28. 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 2.11 for specifications. f. Check FSA plunger. Must move in and out freely. Refer to engine manual.