7–25 62-11640
00039 CHECK ENGINE RPM
• ACTIVATION: In Engine Operation and Alarm 00130 is not active and engine speed is less than 1300
rpm, or greater than 1950 rpm for 5 minutes, or engine rpm to less than 1290 rpm for 5 seconds after the
engine speed has been greater than 1300 rpm for 3 seconds.
• UNIT CONTROL: 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 CONDITION: Auto reset if engine speed is within the specified range for 5 minutes or alarm may
be manually reset using the display mounted keys or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see
if any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Run Pre−trip
Pre−trip 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 test-
ing.) System should run in low speed. (If not, check speed overrides, Section 4.11.3.) Ensure Sys-
tem 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 & 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 F3 through PCM−34 and SP−18 to ENCU−22. Verify correct fuse, see Fig-
ure 2.5. 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
5.2.4) 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 & terminals. Verify no physical damage to components, and no damage or
corrosion in connectors.
e. Check resistance & 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.
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